This is a matching pair as new the world renown battery DAC & matching REGA Top Loading Transport as new (see pictures):
Comes with Two RCA Less Loss Digital RCA cables in 3' each.
See Rave Review in Positive Feedback ISSUE 35 on the Mk-i the MK-II is even better:
Danny Kaey sums it all up:
tossed out the phrase Giant Slayer earlier—some believe this is
simply not possible; they will claim that in the end, only companies
which have the appropriate wherewithal are in fact capable of designing
and implementing a reference level component. While there are certain
elements of truth in that premise, I have to disagree at the fundamental
level. It was none other than Nikola Tesla who brought us AC or
Alternating Current the foundation for our modern day lives. It
was none other than Sir Isaac Newton who defined the laws of universal
gravitation. Last I checked those were all individual men sans
corporate baggage and bean counters that revolutionized our way of
life. Is the LessLoss DAC 2004 therefore a revolutionary,
groundbreaking product? Certainly not within the context of the former
gent's monumental accomplishments.
however believe that LessLoss has in fact created a reference quality
product for far less than perceived reference price. Given that
Lithuania has quickly established itself as leaders in the technology
sector, in particular laser production (as it turns out, many of the
leading worldwide companies and labs utilize laser assemblies from
Lithuania), it comes as no surprise that Vil and Liudas have a winner on
their hands. To those who wish giant killing performance at real-world
prices, the LessLoss DAC 2004 is the pick. Most highly
recommended! Danny Kaey
Retail: $4400 US
See: Sixmoons.com Rave review @
Let’s start from the outside and work our way in. Here you can see
the natural proportions of the completely handcrafted DAC 2004. It’s
quite a heavy piece of gear at 8.5 Kg (18.74 lbs) and contains more than
Colors: Silver or Black
The faceplate of the DAC 2004 comes in two colors. Both are anodized
and brushed aluminum with laser engraved lettering. At the bottom of the
housing you can see the four feet which are individually lathed from
solid stainless steel.
The body of the unit is matte black with a very fine, somewhat sandy
feel. This is achieved by electrostatic application of fine granules and
then baking them together at high temperature. The silver-colored or
dark black faceplate is mounted to the sandy dark black colored body
with no visible screws or bolts on the faceplate.
The two buttons located on the front panel are also individually
lathed and are fit by hand directly into the precisely drilled
faceplate, without the use of plastic washers, inserts, or the like. The
buttons move about half a millimeter when lightly pressed. The actual
switching takes place via multiple high quality relays. The audio signal
does not travel through these relays. These are to override the
internal automatic battery charger if desired.
The laser engraving is carried out by calibrating a wavelength of a
laser light beam to react with the material it is to engrave. This is
esentially a controlled burning process of the top layers of anodized
metal and instantly performs a controlled permanent oxidization of the
surface. There will never be any paint weathering off of the DAC 2004.
There is no paint to wear off. Both front and back panels are laser
The design is purposely kept simple and elegant. The sound quality
achieved by the LessLoss DAC 2004 is incompatible with trendy fashion
and calculated shelf-life terminology.
Quality, not Quantity:
The decision to laser engrave all of the lettering on this unit
allows the designers to delve into detail where standard speedy
production processes would yield but a fair approximation. The laser
used is only 12 microns wide.
Because DACs are often the top unit in a system, the design for the
top of the DAC 2004 includes a hand-inlayed brushed and anodized
aluminum placard. This is a little extra luxury for the sake of beauty.
Let’s turn it around.
The DAC 2004 standard features include balanced and unbalanced signal
outputs. The SPDIF input and Superclock output are also standard. For
some applications, the Superclock can be ordered as Wordclock. 110 or
220 Volts Mains Power are configured by us prior to shipping. If in the
future you would want to change the power voltage, it can be easily
reconfigured by the owner of the unit.
Let’s see the guts.
The LessLoss DAC 2004 has a hybrid power supply. After much
evaluation of all sorts of power supply solutions, this is the result:
you can't beat a balanced battery power supply for the audio signal and
you can't beat a well-filtered mains power supply for digital signals.
There is power filtering before the transformer, after the transformer,
and at every power leg of every IC. No short-cut has been taken
anywhere. Even the batteries are selected for their lack of distortion,
and then additionally shielded within the shield of the device itself.
The rechargeable batteries are quite large and heavy. This is what
you'll be seeing when it comes time to change the batteries (in about
two or more years). The shields for the batteries are removeable by two
bolts for each battery. You unscrew the bolts, remove the shields and
the batteries and then put in the new ones. It shouldn't take but 10
minutes. The electrical connections are easily visible and immediately
The recharging of the batteries is completely automatic. If you want
to charge them immediately, you can press the Charge button. If you want
to interrupt the charging process, you press the Play button. A
completely automatic charge initiation takes place if you leave the unit
on over night. In the morning, you will have a completely charged
system and will be able to play music without a second thought. Many
users completely forget that this device contains batteries.
No Mask -- Less Dielectric Distortion:
Note that the LessLoss DAC 2004 circuit is completely maskless: it is
not green or red as it would be using today's standard production
methods (robotics). Because of the meticulous production method we
employ, we control the entire soldering process and make sure that no
unintentional shorting occurs anywhere. This way, we avoid all
undesireable dielectric effects of the mask which is always employed in
robotic production methods.
Balancing short signal paths with wise circuitry:
The layout is extremely compact. A dual-layer circuit board is
employed. Because this device is hand-built sculpture, even the exact
dimensions of all of the parts including the losses due to the actual
lengths of the various legs are incorporated into the layout. The
digital ground is galvanically separated from the analogue ground, and
the integrated circuits and other numerous components at the bottom of
the circuit board (not visible here) are extremely well shielded from
interference. Only top quality parts are used throughout the DAC 2004.
The carefully formed, pristine audio signal is carried to the outside
of the DAC via solid silver wire, using only the dry air of the
interior of the DAC as dielectric. The audio signal passes through only 5
top quality discrete components (7 for balanced) before it exits the
device. No capacitors are used in the signal path. This signal path is
only ~4.5 cm long to minimize loss and undesired induction.
Distortionless Volume Control:
As an option, the customer can choose an integrated 21 discrete
position volume control, which is a manual shunt-to-ground volume
control located after the DAC chip but before the output stage,
resulting in a customized output level at every turn of the switch. This
enables direct output to active loudspeakers or a pair of mono amps for
the least possible loss in signal integrity.
The DAC 2004 features a hybrid power supply which, together with the
galvanically separated digital and analogue grounds, makes the best
power supply method available for both the digital and analogue
circuitry. The double shielding of the batteries protects the analogue
power supply from parasitic frequencies. Because the analogue ground is
galvanically separated from the digital ground, distortion is kept to
within the limits of the DAC chip.
Thank you for your interest in the LessLoss DAC 2004!
We take much pride in our work, and are always seeking ways to
perfect the State-of-the-Art. It would be our pleasure to serve you and
share with you the joys of extremely high quality sound reproduction.
The LessLoss DAC 2004 MkII features the following main design attributes:
- Distortionless Volume Control Option Available
- Parallel multibit converters, not the inferior sigma/delta type.
- Hybrid power supply: two rechargeable batteries in balanced configuration, independent filtered power for digital.
- Two galvanically isolated grounds, one for digital, one for audio.
- Unrivalled, non-traditional ultra-low-jitter oscillator with superclock (256F) output.
- 192 kHz sampling rate supported.
- Built in automatic battery charger.
- Over 400 Parts, all top of their class.
- Unusual handcrafted topology.
- Practically immeasurable cross-talk between components.
- Jitter suppression via multi-staged(*) synchronous re-clocking.
- Separately filtered and regulated power supplies to each individual power leg of each microchip.
- 4.5 cm signal path from analogue signal source to external audio jack via solid silver conductors.
- Laser-engraved stainless steel and aluminum housing.
- Faceplate available in black or silver.
- Introductory Price: 2995 Euros, at your doorstep.
What the DAC 2004 most definitely is:
- Completely handmade, hand-soldered, hand-assembled, tested, and personally cared for.
- An almost completely non-distorting masterpiece of sound electrical engineering.
- The best our knowledge allows us to create.
- Extremely underpriced as a method of marketing without running high debt.
What the DAC 2004 most definitely is NOT:
- A trendy and well-marketed piece of average quality audio gear.
- Distributed through distributors and resellers, raising the price.
Among the several aspects which constitute D/A audio signal converter performance is the converter microchip
itself. We carefully studied the available technologies and then, only
after narrowing down the choices to only the four theoretically best
choices, we built a device for the sole purpose of comparing these four
technically best converter chips. In our device, all conditions were the
same for all converter microchips.
The method LessLoss used to
evaluate the sonic differences between these four microchips was as
scientific as possible. We used electrostatic loudspeakers and
headphones (almost massless) in order to minimize loudspeaker coloration
of the signals. The opinions of highly regarded audio enthusiasts and
professionals were unanimous. These tests showed that, at least
subjectively, the PCM 1704 was easily the best.
Converter Chip Technology:
We provide two links, one to the manufacturer of the PCM 1704, and one directly to specific data on this microchip.
- PCM 1704
- What the hi-fi magazine Stereophile
had to say when the chip was first introduced. (No, we aren't fortunate
enough to be able to buy them in the thousands, and no, we don't use
the cheaper version, the PCM1704U.)
- The PCM 1704 is out of production and represents the end of the era
when quality was first on the minds of DAC engineering laboratories. In
today's production, all remaining DAC's are of the Sigma/Delta type.
These incorporate more technologies into one chip, including two
channels for stereo, volume control, upsampling, and often even clock
oscillators of their own. Production costs have been saved, but the
issue of quality of sound reproduction is no longer the primary issue.
Many people do not know that the PCM1704 is classified into different categories of perfection. There is the PCM1704U, which is the least expensive and worst lot. Then there are better ones, which are marked PCM1704U-J and PCM1704U-K at the factory. We would like to stress that the LessLoss DAC 2004 uses only the best and most expensive PCM1704’s. We have chosen the best converter and then use only the best lot of these converters.
There is a fundamental difference between the way parallel
multibit converters and the sigma/delta type
work. The parallel type use a separate cascade of resistors and switches
for each dynamic modulation of the audio signal, whereas the
sigma/delta type (or one-bit, as they are also called), rely on a
constant comparator to define changes in the audio signal's dynamic
magnitude. Each method has its own advantages and disadvantages.
The main advantage of multibit conversion is that
they are theoretically less susceptible to the influences of clock
jitter. Their main disadvantages lie in their sensitivity to the
influences of heat fluctuation.
The sigma/delta microchips have the advantage of being less
sensitive to heat fluctuations, however, they react very readily to any
amount of clock jitter.
We compared, using the scientific method of 'same thermal and electrical conditions', the Burr-Brown PCM1704U-K (parallel), the Analog Devices AD1862N-J (parallel), the Crystal CS43122 (sigma-delta), and the AD1955 (sigma-delta).
Of course, on the theoretical level all of these microchips are superb. Nevertheless, some differences are evident:
- Parallel multibit converters display a distortion spectrum
which is more friendly to the ear. This distortion spectrum falls off at
a lower frequency than it does in sigma-delta converters.
- At the lower dynamic levels, parallel multibit converters produce a much more esthetic sound than sigma-delta converters.
- Parallel multibit converters produce less sound coloration, and hence the sound is more natural, more lifelike.
- Details and microdynamics are more readily audible using parallel mulitbit converters.
Our empirical tests showed that these differences are indeed audible and that Burr-Brown's PCM 1704 is the very best converter chip in existence today. Earlier achievements in quality such as the legendary PCM63 have been bettered by the PCM 1704.
A very important issue relating to the quality of a DAC is its power supply.
Even a household washing machine has a power supply filter of some
sort. Most DAC or CD player manufacturers incorporate a similar or
slightly better approach to power supply filtering. Then there are the
few who go to the extreme in the "capacitance race". The results are
costly, but are they the best possible?
LessLoss, in our goal of
achieving the best possible solution, has experimented extensively with
the most radical power supply filtering methods. The result of this is a
realization of the fact that a real-time power supply filter can never
approach the quality attained by the filtering of power using the
chemical means of rechargeable batteries, except in the digital realm.
Battery Power Supply:
It is widely known that wide spectrum frequency interference
causes intermodulation distortion in any audio amplification system.
Purifying the power voltage from this wide frequency spectrum 'trash' is
the goal of the power supply filter. However, in doing so, it also must
not bottleneck the current flow to the amplification circuit. Excessive
use of capacitance is the traditional solution to this problem. Other
extreme solutions include running multiple transformers in series. These
are highly costly and impractical solutions. Even when using battery
power, some electromagnetic induction of high frequency interference
occurs. However, as the amount is small, it is effectively filtered via
the use of a small value capacitor.
Advantages of Battery Power:
- A battery is a source of direct current voltage. Using the alternating current
of the city mains means not only rectifying the current using a diode
bridge, but also filtering it using a large capacity electrolytic
capacitor and voltage stabilizer. Even then some amount of undesirable
pulsation enters the schematics, and these pulsations include a vast
array of harmonics all the way up to the mid-audio bandwidth (about 1
- A side-effect of diode bridge rectifiers constantly turning on/off is that this results in undesirable switching interference
of a rather wide spectrum. (For this reason there are all sorts of
solutions such as "soft recovery" diodes which aim to lessen this
- Diverse interference enters the mains via sources such as electric motors, microwaves, vacuum cleaners, etc.
- A diode within a diode bridge bears similarity to a diode detector
in a radio receiver which turns radio frequency broadcast material into
audio signals. If the DAC is to be used near a strong radio signal
source, then that parasitic signal can enter the DAC's schematic.
The LessLoss DAC 2004 uses a multiple relay circuit to charge the batteries from the city mains while the device is not in use. When the user presses the Play button, the relays switch the mains power to the charging schematic off. The relays totally galvanically isolate the audio schematic, including the ground. This frees the DAC 2004 audio schematic from any and all
influence resulting from mains interference. This could include your
microwave oven, your CD player, or even your local radio station.
The digital section, on the other hand, actually benefits from wisely
filtered mains power. In earlier designs, we did incorporate a separate
battery for the digital section, but as our newly developed mains
filtering solution clearly outperforms any battery solution for digital
schematics, we have since abandoned the use of battery power for the
digital section. Thus, the DAC 2004 presently employs a hybrid power
supply based on a highly filtered mains power supply for the digital
section and a balanced battery power supply for the analogue section.
Low Frequency Performance on Batteries?
It is often feared that low frequency performance is hampered by the
use of battery power. This is probably due to widespread faulty circuit
topology, but certainly not due to the batteries themselves. The DAC 2004 includes two separate batteries. They provide balanced power
to the analogue schematics. These are the requirements for the best
starting conditions for the cleanest operation of the audio signal
25x the Theoretically Necessary Current:
The fully Class A battery power supply is constantly supported by 25 times
the theoretically necessary current. This results in an operational
time between battery charges of approximately 10 hours. When the
batteries are low, the onboard automatic battery charger circuit
automatically applies a trickle charge to the batteries. You can listen
to music non-stop with no interruption to playback. When you want, you
can press the Charge button and have the unit mute playback and charge
the batteries overnight when you are no longer listening.
By pressing the Play button, the user may choose at
any time to prematurely interrupt the charging process and commence
playing before the batteries are fully charged. An adequate trickle
charge remains, ensuring that the unit never cuts off the music.
Best Possible Performance Over Time:
The charger begins charging the batteries before
they run down. This prolongs their life and guarantees the same level of
performance from them throughout their lifetime. Indeed, many users
completely forget that this is a (partly) battery-powered unit !
After every effort is made to ensure that the power supply is as free
from high frequency interference as possible, it is important to draw
our attention to the inner workings of the schematics
themselves. Here, too, because of the potential interaction of the
digital and analogue schematics, care must be taken to ensure that we
encounter no loss of quality.
Because LessLoss strives to
achieve only the best possible solution, care is taken to separate the
digital ground from the analogue ground. This is necessary because the
digital input portion of a DAC acts as a mini transmitter of high
frequency electromagnetic radiation. Not due to design, but due to the
inherent properties of the high frequencies themselves.
Electrically and Galvanically Isolated Grounds:
Although many DAC designers are most likely aware of the issues involved in ground contamination
by high frequency devices, often times these aspects are deemed too
costly to overcome, and, hence, they are either ignored or dealt with in
As in the concept of battery power, LessLoss seeks the solution deeming the highest quality performance. This solution is found in electrically and galvanically isolating the digital and analogue grounds
from each other. Only the rarest DAC design of high cost and commitment
incorporate such a solution. Perhaps only two such manufacturers exist.
High Frequency Radio vs. Low Frequency Audio:
The digital input section contains a lowest jitter high frequency oscillator
running at several MHz. This high frequency behaves differently than a
low frequency audio signal. Every milimeter of distance that such high
frequencies travel, and every component or voltage that these
frequencies pass by locally on their way around the circuit influence
them. In turn, they also influence their surroundings, in effect acting
as radio transmitters propagating this signal.
Because this frequency is desired at one, and only one location within the analogue schematics, care must be taken to isolate it at every twist and turn it takes. In the DAC 2004, you can see the transitional section between the digital and analogue schematics clearly.
Please do not confuse our solution with the typical solution of
simply putting the digital schematics on their own circuit board and
connecting the various circuit boards with a bus-type cable. This is one
of the worst Jitter-inducing methods since the bus is an antenna.
That's why one sees various player upgrades with aluminum foil or copper
foil covering the bus connections. The best method is not to
incorporate this lossey distance into the design in the first place. In
the LessLoss solution, both the digital and analogue circuits are on the
same circuit board. There is no electrical or galvanic connection
between the two, deeming the least ground contamination in the analogue
The problem of Jitter in digital audio conversion can be understood
when you think about Fourier synthesis of a square wave. A square wave
is made up of an infinite number of harmonics. So, to generate and to
transport something even close to a square wave running at 33.8688 MHz,
you need to have completely controlled electromagnetic circumstances
well up into the multi-Gigahertz region (for true-to-life quality even
up to infinity). It may be argued that timing Jitter is born of the very
noise inherent in any electromagnetic space, and this includes a
complete vacuum just as it includes a brick and mortar wall.
Realizing this, the makers of the LessLoss DAC 2004
minimize Jitter by means of synchronously re-clocking the digital
signal at crucial stages along the path that this highly sensitive
signal must travel. This is necessary because no digital signal is
immune to the multiple sources of Jitter, which
includes the passage of the signal through the noise inherent in the
nature of electromagnetic space. The less Jitter, the better the audio.
So we want no Jitter. In order to avoid a jittered signal, a low-jitter Master oscillator is required, which is built into the DAC 2004 and located as close to the actual converting components as possible.
Lowest Jitter Clock Oscillator:
The digital input section of the LessLoss DAC 2004 contains an extremely low jitter high frequency oscillator running at 33.8688 MHz. The heart of this low jitter clock is the high quality quartz oscillator. The pure and predictable voltage given to drive this component is key to its practically jitterless functioning.
We use a very high quality analogue quartz sinus generator which is
later turned into a square wave digital signal by means of a super fast
comparator chip. In this way we achieve the best possible results.
This is Jitter as it might be depicted in a low budget Hollywood film. Highly oversimplified and very black-on-white, this serves to show visually that Jitter is a distortion of the time domain.
The best method of overcoming Jitter is to minimize the distance
between the oscillator and the converter chip. Any piece of
semi-professional digital audio equipment is capable of running in both MASTER and SLAVE modes.
- Digital MASTER means that the device is running off
of its own internal clock. The distance between the converter chip and
the oscillator is small (internal wiring only).
- Digital SLAVE means that the device is running off
of yet another device's internal clock. This means that there is an
external cable bringing the clock signal from the external piece of
equipment (the Master) to the Slave. However, this clock signal needs to
be extracted from the complex digital signal containing not only the
clock but also the changing audio information itself, whose irregularity
also introduces jitter.
Perhaps the worst problem with using an external DAC in conjunction with a common household CD player is that the CD player is always the Digital MASTER. Although the LessLoss DAC 2004 outperforms most any DAC even in SLAVE mode, the truly highest performance is obtained while using the DAC 2004 in MASTER mode.
Less Loss Leads to Hi-Fidelity
There is a clock output from the DAC 2004 which
enables the user to slave an external digital source such as a CD player
or digital sound card to the DAC (provided the soundcard has a
superclock 256F input). In this way, the source digital player, or
signal provider, is locked to the ultra-low-jitter clock from the DAC. The converter chip (the PCM 1704) is also locked to the very same clock. Because both source and converter are both locked to the same clock, Jitter is maintained at extremely low levels.
In order for a household CD player to function in this way, it must
be modified. Only a few commercially available models exist which can
run in slave mode. These players are among the most expensive in
existence. We provide you with information
as to how to do this to an average unit but we will not accept any
responsibility for the destiny of your equipment. It's easy [if you can
solder]. There will be no further support offered from our part but we
believe that there are plenty of experienced enthusiasts worldwide who
would take the time to make this simple yet most effective modification.
Less Loss Leaves No Leaf Unturned:
Because LessLoss is determined to minimize jitter to the lowest of possible levels, we go the extra step to re-clock (also known as quantizing)
the digital data to near-perfect timing just a few millimeters before
it enters the audio domain. (This image helps depict graphically what
this process does -- green is where the signals should be on the graph
paper, and red is where the signals are due to Jitter. The re-clocking
slides them back into place.)
In SLAVE mode, all Sampling Rates up to 192 kHz are supported.
In MASTER mode, the typical Sampling Rate
supported is 44.1 kHz with 33.8688 MHz or 16.9344 MHz outputed to the
clock output for slaving a CD player to the device. However, upon user
special request, we will accomodate all of the following sampling rates:
- 44.1 kHz
- 48 kHz
- 88.2 kHz
- 96 kHz
- 176.4 kHz
- 192 kHz
Full 24 bit resolution is supported at all frequencies.
Digital Deemphasis is supported at 44.1 kHz and at 48 kHz.
If the unit detects a different signal other than standard audio PCM input, such as Dolby Digital or dts, then the unit automatically mutes. These formats are not supported.
Every wire distorts a signal to some extent. Every meter is made up
of 100 centimeters. Every centimeter is made up of 10 millimeters. Every
millimeter distorts to some extent.
The LessLoss DAC 2004 is designed to minimise every loss possible. The grounding and wiring technique used is much, much more than meets the eye.
Extremely Compact Design
Today's mass-produced electronic parts such as resistors, inductors,
and microchips are smaller than ever. Their small size allows for more
compact designs. When constructing a piece of electronic equipment,
usually a robot is used. In order to be able to build the equipment, the
robot requires certain conditions in the design. Among these is the
need for a flat surface area with plenty of room for manipulation. The
movements of the robot are standardized.
Robots Are Fast But Humans are Smarter:
Because the goal of the LessLoss DAC 2004 is to aim for perfection
in Digital to Analogue conversion, every effort is made to shorten the
lengths of all crucial signal paths. Because there are so many crucial
signal paths, the design is incredibly compact. The unit is assembled
entirely by hand. We solder directly onto the legs of the integrated
circuits. In some cases, we actually stack the components directly on to
one another. In this way, we really do achieve the shortest possible
signal lengths, which no robotic process can possibly achieve.
Another perfection we offer over mass-produced gear is the fact that
we do not use a mask on the circuitboard. The mask is a sheet of
chemical material added to the top of a circuit board which is usually
either green or red. Audiophiles tend to agree that the red composition
results in a somewhat better sound than the green type. The reason the
mask is brought onto the circuit board is that, when a robot is
soldering, the speed and accuracy of this process both have mutual
trade-offs and this can result in solder being squirted over areas which
might make undesired contact (a short circuit, for example). To avoid
this, the mask is used to keep all cases of such occurrences from
resulting in production faults.
We go all the way to the extreme and do not use the mask altogether.
In doing so, when we solder by hand, we control the entire process and
make sure that no unintentional shorting occurs. In this way, we avoid
the undesireably dielectric effects of the mask altogether.
What going to the extreme means:
Several of the microchips used in the LessLoss DAC 2004 MkII have
legs which are only 1.4 mm apart. We hand-solder these microchips in a
very special way, placing parts directly onto them at the most crucial
signal paths. This is extremely difficult to carry out successfully and
Vil is the only person engaged in this delicate process. Much of the
work done on the DAC 2004 MkII is a completely forgotten art these days.
The beautiful sound of the DAC 2004 reflects this during every minute
The intricate work put into the hand made DAC 2004 is appreciated by
all who listen. When we say shortest possible paths for all crucial
signals, we really mean it, as this has a direct effect on the limit of
Good Topology Is More Than Short Signal Paths:
Because everything affects at least something else in audio equipment
design, short signal paths are only half of the story. For the very top
possible quality, some components must be elevated to avoid dielectric
effects, and others must be hyper-shielded. All of these details
together make very audible differences and it is the combination of all
of this plus our extensive critical testing with both audio material and
test signals which results in what was we consider the present
We seek the most desirable type of volume control. Would it be a
passive preamp? An active preamp? Would it be digital? Analogue?
Discrete? Perhaps a potentiometer? What are the losses involved in
adjusting the volume level? Can these losses be completely overcome and
avoided altogether? Do we really need pre-amps? All of these questions
are answered here.
LessLoss now offers a
completely distortionless volume control option integrated into the DAC
2004. We would not offer it if we weren't sure that it represents indeed
the best possible solution to the problem. To adjust the pristine
signal of the DAC 2004 by any other means is a compromise. We offer you
this information so that you may find out how it's done correctly.
DAC 2004 :: The analogue output is already pristine.
In the DAC 2004, the signals for the analogue outputs at the back of
the unit are accessed from the circuit board via very short solid silver
wires suspended in mid-air. Between these silver wires and the very
output legs of the Burr-Brown PCM 1704 converter chips are only 7
top-quality components (5 for the unbalanced RCA outputs). The purpose
of these components is to transform the output of the converter chip
from a signal composed almost entirely of current swings to one composed
almost entirely of voltage swings. This is known as I/U conversion, or
the output stage. In the case of the balanced outputs, the signal is
also balanced to provide near-lossless signal transfer over a distance
of cable. Please note that the DAC 2004 has absolutely no capacitors in
the signal path from DAC chip to external plug.
The other purpose of the output stage is to provide the desired
voltage level to the output signal. In home hi-fi applications this is
usually 2 Volts RMS, but it can be adjusted during the manufacturing
process to whatever desireable level is needed for the given
application. This can be any level up to 4 Volts RMS. This involves
changing a couple of resistors.
DAC 2004 volume control :: What are the options?
Once the output level is set via the above stated shunt-to-ground
resistor, it corresponds to the maximum volume level. Volume controls
usually lower the volume level to acceptable listening levels. This can
be done in various ways.
In the digital domain prior to D/A conversion.
This is the worst way to control volume level. You not only loose
bit-depth of your signal, you also introduce rounding math errors, and
ultimately reduce the signal/noise ratio of the actual conversion
process. You do not utilize the DAC chip in its best operating
conditions, and receive a distorted output signal as a result.
In the analogue domain after D/A conversion.
This is much better. We not only use the original bit-to-bit digital
sound signal, we are also using the DAC chip to its full potential and
are receiving the closest possible reproduction of the original
soundwave which was encoded into the digital domain.
In the analogue domain, we have the following choices:
With active components in the signal path.
All active components need a power supply. Adding components with
their own power supplies to an already pristine signal only in order to
lower the volume level will inevitably add distortion due to the
interference that the power supply carries. Even if the power supply
would be ideally clean, then the losses would be equal to the losses
incurred by the active components themselves, such as resistors and
transistors, which would be placed in the signal path. This could also
be a potentiometer used with a linear amplifier.
With passive components in the signal path.
Passive components, such as resistors or transformers, when placed in
the signal path, affect both the level and the quality of the signal.
No transformer has a completely linear behaviour, especially in the low
audio frequencies. Quality discreet switches always have a more exact
contact than any type of potentiometer.
With passive components not directly in the signal path, but shunt-to-ground.
This is the best possible method of volume control, and this is the
method we utilize in the DAC 2004. This is a passive buffered
shunt-to-ground volume control, with 21 discreet positions, with nothing
directly in the signal path. This type of volume control does nothing
other than switches the very output voltage of the output stage of the
DAC 2004. The load on the output leg of the DAC chip remains exactly the
same for all volume levels, however the output level is adjusted before
the output stage. The DAC 2004 without volume control has an output
buffer set at any level the user desires. However, the volume control
option allows the user to actively choose the very output level which is
If you use an external processor such as an external volume control
(for some reason), you simply leave the DAC 2004 volume control at the
highest level of the volume knob. The significance of this is: by using
our volume control, it would be the equivalent of customizing the DAC 2004 to a special output level at each click of the dial.
This is normally done by changing the value of the resistors used by
means of the soldering iron. It is the very best possible volume
control, because nothing whatsoever (not even a millimeter of silver
wire) is added to the signal path, and in effect you would have not only
the exact same sound as without any volume control whatsoever, but
you'd have it at the very listening level you desire.
The best solution means, quite simply, the least loss.
No external type of volume control can compete. We have tested
with/without the volume control and it is impossible for us to measure
any difference between the version with soldered resistors
(schematically set output level) and the addition of switching contacts
to achieve the variable output signal level. In fact, outboard volume
control is worse already by logical conclusion of the following, even if
the outboard volume control itself were completely utopian:
Count the minimum number of parts that the signal must pass through: A
cable connector at the preamp. A plug at the preamp. Internal wiring in
the preamp (using plastics, guaranteed). Internal unbalancing
schematics (in the case of balanced signals) at the preamp. Active or
passive volume adjustment in the preamp. Balancing schematics. More
internal wiring, an external plug. Another connector to the cable which
goes to the power amps.
In our solution all of the above are bypassed. You have the possiblity to run direct cabling from DAC to power amps, which, ideally, should be placed directly next to the loudspeakers.
What power amps are compatible?
The input impedance of the amp used in conjunction with the DAC 2004
with volume control option can be anywhere from 10K - 100K Ohm. The
input sensitivity can be from 1V - 4V.
The DAC 2004 with volume control is perfectly suited for use with
electrodynamic headphones from 250 Ohms upwards. For example, the
legendary Sennheiser HD650. The original cable will not do because of
its low quality and because of its connecting jack. The DAC 2004 has two
XLR balanced outputs which should be used with headphones. The wiring
schematic is as follows:
DAC output XLR pin 1:
Connect it to the shield of the headphone cable.
DAC output XLR pin 2:
Connect it to the signal "+" (smaller pin) of the HD650 headphone cable.
DAC output XLR pin 3:
Connect it to the signal "-" (larger pin) of the HD650 headphone cable.
The shield of the headphone cable is not to be connected at the
headphone end. It should be left floating at the headphone end. The more
you shield, the better it sounds.
We can add level to the standard DAC 2004 to accommodate the levels you'd like. Email us and we'll work out what's best for you.
When an engineering team is presented with the parts budget for a device they are constructing, they are forced to make many compromises.
Even though, remaining within the budget, they choose the least
possible compromise, several of these small compromises together result
in perhaps a fairly good solution, but by far not the solution that was initially envisaged by the engineers.
LessLoss engineers have the advantage of total freedom in every choice of componentry and design. The DAC 2004 is the exact realization of their initial componentry wish list. LessLoss employs only such components which lead to the best possible solution. Is the price too high to pay for such noble components? At LessLoss, such questions are never raised.
DAC 2004 :: Specifications
- Signal/Noise Ratio: better than -120 dB
- Frequency Response : 10 Hz – 20 kHz +/- 0.2 dB @ 44.1 kHz
- THD+N @ 0 dB: 0.0009% [@ 1 kHz, A weighting]
- THD+N @ -20 dB: 0.006% [@ 1 kHz, A weighting]
- Analogue Out Level: 2V RMS (other levels available upon request)
- Main Power: 220 or 110 V, 25 W
- Batteries: 2 x 12V: 1.8 or 2 or 2.2 Ah
DAC 2004 :: Physical Specifications
- Unit Weight: 8.5 kg
- Unit Width: 44.1 cm
- Unit Height: 6.4 cm
- Unit Depth: 25 cm
- Outer Packaging Dimensions: 60 cm x 40 cm x 40 cm
- Weight Including Packaging: 9 kg
The entire LessLoss CD Playback System consists of the following:
- LessLoss DAC 2004 MkII with Volume Control Option
- LessLoss S/PDIF digital coaxial cable
- LessLoss Digital Clock cable
- C.E.C. TL-51X transport, in slave mode to DAC 2004
- LessLoss Dynamic Filtering Power Cables
- LessLoss Firewall Power Filter
This is a lot of stuff, and all of it has only one goal. The goal is
preparing the perfect conditions for the mono PCM 1704 (obsolete)
converter chips which were the most technologically advanced and
expensive to have ever been created. These have never been utilized to
their full potential, until LessLoss created the DAC 2004 MkII.
The circuitry of the DAC 2004 MkII is already created with the goal
in mind to annihilate all possible Jitter, which is known to be the
primary source of distortion in digital equipment. However, this is not
the end of the story when seeking the ultimate of all ultimate
One must at this point view the entire digital playback system
holistically, because every other component or cable has influence on
the sound as well. Most of this is Jitter related. It is brought about
by induction into cables or by feeding power into the gear which
contains high frequency noise.
The LessLoss system is completely noiseless, and on this silent
backdrop is capable of bringing forth the most pristine analogue signal
from the digital domain. We do not offer anything which is viewed as an
accessory. Although we strive to lower costs for our customers, they
will always find the LessLoss solution to bring about the very best
results possible. Other
solutions, be they filtering devices, power cables, or digital cables,
will always leave something to be desired. That is why our best offer is
the holistic offer -- where each and every component works in tandem to
yield the very best possible performance of the conversion process
itself. And when this is done properly, there is absolutely nothing
'digital' left in
the sound, and one is free from any listening fatigue. Relaxation and
pleasure remain the final emotions experienced. Forgiving amps and
loudspeakers are no longer needed, as there is no harshness to round
At this level, instead of fine-tuning a sound, one simply rejoices in having perfect focus on a dark and silent background.
One of our favorite reactions so far has been "I cannot tell whether
my equipment is on or off. I am no longer even concentrating on that. My
mind is now free to completely savour the music, which is all I ever
intended to do in this hobby from the start. Thank you so much for your
achievements, Liudas and Vil!"
Just about any professional studio gear utilizes the proper
Master/Slave relationship between digital source devices and converter
devices. We did not invent it. The reason it works is that the master
clock for the entire system is as close to the converter chip as
possible. This is the single most effective way to accomplish
jitter-free audio reproduction.
LessLoss would like you to know
why some digital gear sounds bad. The reason is mostly Jitter. To avoid
Jitter, you need to make your CD player slave to the DAC 2004.
This is a very simple procedure. It is true that some companies charge
up to $20,000 for the exact same thing you can do to any $30 player for
How to Slave your CD Player to the DAC 2004
The CD or DVD player needs to have a generator (clock oscillator) of the same frequency which is used in the DAC 2004.
We ask that our clients open up their CD player and check what
frequency their clock runs on. If your frequency is one of the
following, then you can use the DAC 2004 in Master Mode, which means you
can run your CD player in Slave mode (the best possible way).
Here are the frequencies you should look for:
- 11.2896 MHz
- 16.9344 MHz
- 33.8688 MHz
If you have any of these frequencies on your clock oscillator, let us
know and we will customize your DAC 2004 to run in Master Mode in
conjunction with your CD player. Any other frequencies are presently not
In essence all you need to do is desolder and remove the quartz
resonator from the CD player, and where one of its legs were, solder on
the end of the middle conductor of a coaxial cable (any old coaxial
cable will do, but LessLoss also offers ready-made digital cable of the
highest quality if you are interested). The shield of the cable should
be soldered to the closest ground in the CD player you can find.
To determine which leg contact to connect the cable to, sometimes you can do the following experiment:
- Turn off the CD player. Unsolder and remove the Quartz Oscillator.
- Turn on the CD player. Touch the end of a screwdriver to one of the
contacts where one of the legs were. See what happens. Then let go of
the contact. Then try the other contact. See what happens again.
- Whichever contact gave the most activity from the player, i.e. motor
started turning, changing speeds, the laser motor started adjusting
itself, etc. That's the contact you want to use for the Master Clock cable.
On some players, the experiment described above is not enough, since
both contacts seem to have the same effect. In that case, it is highly
likely that both contacts will work, but one of them will sound better
than the other. This depends on the brand and model of CD player. There
are so many of them that it is impossible to list all possible
scenarios, but your ears easily show you the way.
That is what you need to do to slave your CD Player to the DAC 2004. The other end of the coaxial cable is to be connected to Clock Output of the DAC 2004.
This will lower the Jitter amount at the DAC by a very substantial
amount, and it is possible for any audio enthusiast who has experience
in soldering to carry this out.
A slaved CD player.
When our clients send us the required photos of their CD player, we
draw on them to help them see where and how to connect our superclock
Even better results.
It is possible to achieve even better results. For the very best
possible digital playback, additional power filtering is necessary. In
conjunction with this step, a fully synchronous reclocking schematic can
be added into the CD player itself. This requires more expertise in
electronics than the average audiophile usually has. Testing equipment
is necessary, and building custom schematics is needed. We can carry out
this special modification of your CD player. Shipping back and forth is
not always the best solution. We can also offer the full customization
of a new mass-produced CD player.
Soldering Enthusiasts :: Make a CD Player and Slave it to the DAC 2004
You can get some ideas and inspiration from here. But make sure the quartz frequency is one of the three mentioned above. We have our theory that 16.9344 MHz is the best.
If you have questions please contact us
< =============================================== >
Weinhart Design is here to earn your trust & future business and always interested in purchasing quality Audio, LP
collections, specialists buying Audio Estates and interested in most quality trades
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accept payments by Bank Wire Transfers without fees and is the only
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Please visit our "ALL NEW & Improved Web Site @ www.weinhartdesign.com
Call me directly in my Audio showroom in Los Angeles weekdays
from 11-4PM @ 310-472-8880 or on my cell including weekends from 10-10PM
at 310-927-2260 and I can answer your questions and help you with all of
your new and pre owned needs.
Making better Sound One
system at at a Time,
Weinhart Design, Inc.
President & CEO
The Audio and Video Expert
e: [email protected]
2337 Roscomare Road, Studio #1 Showroom) 310-472-8880
Los Angeles, California 90077