Jeff Rowland Cadence Phono Stage Balanced Cardas Power link cable

Jeff Rowland Cadence Phono Stage Balanced Cardas Power link cable

For sale the Jeff Rowland rare Cadence Phono Preamp.

Excellent condition! Tested and worked on the Coherence Preamplifier. Please see our auction on this item also!

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The information below is from stereophile magazine.

Step-up with Cadence

The circuit design and parts selection of the Cadence moving-coil
phono stage match the Coherence in quality, sophistication, and
simplicity.

The prime criterion for superb moving-coil amplification is the
ability to extract and preserve the dynamic integrity of a minute,
sub-millivolt signal while precisely mapping the RIAA curve. This is no
trivial task, but one ideally suited for a step-up transformer—provided
it's carefully designed and matched to the range of cartridge parameters
it's likely to see, as well as to the following amplification stage. A
moving-coil cartridge is an inherently balanced device. Rowland took
advantage of this by encouraging Jensen to design a special MC step-up
transformer optimized for a circuit of low impedance and very low noise.
This is unlike most step-up devices, which are followed by a
high-impedance amplification stage.

The resulting Jensen JT-346-AX step-up transformers sport a very wide
bandwidth of over 200kHz, "almost immeasurable" phase distortion, and
an extremely high Common-Mode Rejection Ratio (CMRR): from 145dB at 60Hz
to 106dB at 3kHz! High CMR can be particularly important in a phono
stage due to the considerable amount of common-mode noise that often
contaminates the low-level signals in tonearm leads.

The two transformers are completely encased in their own
triple-mu-metal, double-copper-plated nested shields and are not
ground-referenced, in order to prevent ground-current leakage from
contaminating such fragile signals. The transformers can also be
optimized to essentially any MC cartridge on the market by choosing one
of four ranges via the Cadence's front-panel button. The low-gain
setting has two impedance ranges: 250 and 400 ohms, ideal for cartridges
whose DC resistance ranges from 5 to 25 ohms; and from 25 to 60 ohms
and above. The high-gain setting also has two levels: for cartridge
resistances of 3 ohms and below, and those between 3 and 5 ohms.

The transformers are followed by an AD-797 op-amp chip, used to shape
the bottom half of the RIAA frequency curve (50Hz-2.12kHz). Above this
frequency, the RIAA shaping is done with a purely passive topology using
top-quality components. Unlike typical, series-feedback active
equalization, which tends to cause a rising response above 20kHz,
passive handling at the top end of the RIAA slope allows the ultrasonic
response to continue to drop off at 6dB/octave.

Following the RIAA stage, a very robust INA-103 instrumentation
amplifier buffers the unit's output and allows the Cadence to drive long
lines and capacitive loads with relative ease. The Cadence can be
powered by the second output on the Coherence's battery power supply, or
can be bought as a standalone unit with either its own battery or an
AC-only supply.

A sonic reference

The credo to which any top-drawer preamplifier must aspire is also
of paramount importance to me as a reviewer and music lover: First, do
no harm. While no preamp I've evaluated is truly transparent, a few at
the upper end of the quality scale come close—and not all of them cost a
small fortune. Without a doubt, though, the Coherence and Cadence are
solid members of this elite class.

Sonic differences can be heard even among the best preamps, yet it's
all too easy to exaggerate such differences when describing what often
amount to subtle shifts of timbre, dynamic shading, transparency, and
image perspective between otherwise top-tier products. When evaluating
products that strive for genuine neutrality and are solidly
engineered—such as the Coherence and Cadence—it's also easy to attribute
qualities to the preamp that properly belong to other components or
variables in the record/playback chain. Ironically, there's often more
to say about the sound of those models—some of them very costly—that use
subtle colorations for euphonic appeal, and about second-class products
in which budget restrictions place an audible cap on performance.

My impressions of the Coherence apply in full to the Cadence as well.
However, the Cadence made its own mark as easily the quietest and most
dynamic phono stage I've heard. Indeed, with my ear to the tweeter and
no material being played, it was as quiet as my digital processor! This
fact is all the more impressive because much of Honolulu, where I live,
is notorious for strong RFI/EMI fields. In my experience, the
Coherence/Cadence rig took the brass ring as the most consistent
performers in their class, particularly in such tough environments.

Good bypass tests can ferret out and confirm subtle variations
between competing products, while adding a critical measure of
proportion that helps tether one's perspective to terra firma. In this
case, I achieved a healthy 86dB SPL at my listening chair by directly
connecting the 2V output of a Muse Model 296 24-bit/96kHz processor to
the active crossover of my Audio Artistry Beethoven Grand speakers.
After repeated listening to familiar tracks, the preamps under test were
reinserted and precisely matched to the direct digital source, with
only a short interconnect as a second variable. This technique
eliminates the attenuator and/or impedance variations possible when
using a passive line controller, or a CD player with built-in volume
control, as a "bypass" setup.

Under such scrutiny most preamps quickly reveal a loss in
transparency, shifts in image perspective and/or focus, and masking of
low-level harmonic decay. Poorer models even show evident timbral
colorations and a blunting of the leading edges of transients. That
said, it's surprising just how small in scale these anomalies are among
the better preamps I've auditioned.

There was a very faint loss in transparency when the Coherence was
added to the chain during these tests, and though I easily heard
extremely fine levels of decay detail through the preamp, the direct
bypass mode made subtle decay characteristics slightly more immediate.
However, it took multiple attempts to sort out these variations with
certainty, and resolution of the leading edges of transients and
harmonic timbres remained remarkably consistent with that of the direct
sound, varying only with a small increase in smoothness and the richness
of broadband timbre with the Coherence in the system. However, the big
surprise—and a first for me—was that the Coherence actually sounded
better to my ears than the direct digital source in two key areas: a
greater sense of envelopment by the music; and a greater solidity, or
"body," to sonic images.

Perhaps these subtle improvements over the direct source were due to
the reduction of high-frequency artifacts from the processor's output by
the low-pass filtering and CMR qualities of the preamp's input
transformers. While I'm speculating here, that's one plausible
explanation. Your mileage may vary, depending on your source components
and electrical environment. Nevertheless, the Coherence was the overall
winner in these revealing bypass tests—one reason it's still my
reference preamp.

But as illuminating as A/B tests are, they don't fully convey the
musical impact of a given preamp in a given system. Only extensive
listening to a wide variety of familiar material can do that. And it was
over the long haul that the Coherence and Cadence really shone.

Enduring sonic characteristics of the Rowland rig included
crystal-clear boundary definition of the soundstage combined with an
uncannily seamless resolution of acoustic space within those borders.
This gear conveyed such a high degree of transparency and transient
dexterity that I could easily identify faint recording nuances and the
finest imprints of source components. Delicate harmonic textures were
vividly preserved during their journey through the preamp, and both the
leading edges and decay tails of transients were cleanly delineated with
seductive effortlessness, yet without suppressing the rhythmic drive of
music or making it sound overly recessed. Indeed, the Coherence
portrayed outstanding broadband dynamic contrast.

But perhaps most striking was a unique combination of two of the
attributes mentioned above. When I listened to good recordings through
the Coherence, I heard a deep, expansive soundscape anchored by superb
low-frequency grip and extension, along with a powerful sense of being
enveloped by both the music and the recording venue. In my experience of
components that convey good depth, the soundstage usually starts a fair
distance behind the speakers and extends back from there, lending the
sound an overall laid-back perspective. Through the Coherence, the
soundstage and instrumental images were spread across the breadth and
depth of the room behind the speakers, while a subtle yet tangible sense
of the venue's acoustic extended beyond the front of the speakers,
embracing me with a powerful sensation of presence. Obviously, the
speakers and the rest of the system must be up to the task, but this
appealing amalgam of sonic illusions really stood out with the Coherence
at the helm.

Wrap-up

Regardless of the actual cause-and-effect relationships that led to
the stellar performance of the Coherence/Cadence, there's no denying
that the system constitutes a tour de force of preamplifier design.
However, though this combo's sound quality has not been surpassed or
equaled in my living room, at least two other line-level models pending
review have come close enough—and for considerably less than
$17,800—that I can't make a blanket recommendation if sound quality is
your only criterion.

I do, however, strongly endorse this dynamic duo to anyone who
insists on the very best across the board, including a bulletproof
interface to the outside world to ensure rock-solid stability regardless
of your environment and associated gear; who expects robust reliability
for long-term, trouble-free performance; who demands true
reference-quality sound without the preamp adding a dominant signature
of its own; and who places high value on superb workmanship, and an
aesthetic design in which form and flexibility of function are
beautifully and uniquely realized.

If this describes you, it's imperative to audition the Coherence
before choosing a new preamp to anchor your reference system. Likewise,
for analog devotees who wish to hear all of the wonders buried in your
favorite wax, the Cadence belongs at the top of your wish list. Even if
this system's hefty price puts it beyond your consideration, every
audiophile should take a serious listen to the Coherence and Cadence,
should the opportunity arise. You'll surely be enriched.