Wyred 4 Sound ST-250 Amplifier

This ST-250 is in like new condition. The amp has been fully test and works perfectly.
Please see a sample if the many positive reviews and customer feed back this amp has received.

High-end dual mono 125wpc stereo power amplifier

Wyred 4 Sound's entry level – and most
detailed – stereo power amplifier, the ST-250 offers outstanding
performance at an unbelievable price. Stable to 4 ohms, there are few
speakers the 250's can't handle.

The ST-250 is a true dual mono design, using
the same ICE based amplifier modules as the $1695.00 Bel Canto S300 and
Jeff Rowland $1800.00 stereo amp. The ST-250's are then modified to
sound better. Modifications include extensive use of Dale resistors and
Muse audiophile grade capacitors as well as other upgraded parts.

These amps also feature a custom buffered
dual FET input stage designed by Bascom King. This very high quality
input stage has an input impedance of 61k to work with both solid state
and tube preamps.

You will find all specifications listed below, but it is worth
noting that these amps have a distortion level below 0.02% and a
damping factor of 2000 for tremendous woofer control.

Sonics are exceptional with superb low level
resolution, exceptional transparency and tremendous bass detail and
extension. There are a number of big name 100-150 watt ICE based amps
that have received excellent reviews all over the world. Rest assured
that the ST-125 is as good as the best and better than most.

The standard ICE modules which are found in
the many other amplifiers have 8K ohms on the positive input and 10K
ohms on the negative input to the ICE amp. So if you’re using RCA’s,
your source would be driving an 8,000 ohm load which isn’t really bad,
but much harder to drive than 61.9K ohms. The lower impedance your
source has to drive, the more you will experience lower volume levels,
and slightly higher distortion going into your amplifier. This normally
changes the way a preamp can amplify the signal applied, thus giving you
less than optimal sound. Balanced amplifiers (differential, driven from
+ and – signals) have a much better performance when driven balanced.

All the parts used in the ST250's input
buffer are of the best quality: Dale Rn55D copper leaded resistors,
Wima, and MUSE audio grade capacitors, and a thick traced PCB to connect
everything. Audio signal doesn’t sound as good through standard
magnetic steel leaded resistors, and electrolytic capacitors. Inside the
FETs on all of Wyred 4 Sound input buffers, there is a voltage to
current conversion for a 'sweeter’ sound. The way a FET works is the
current that flows from the output (the drain to source current) is
controlled by the voltage on the input (the gate). This has a softening
effect that complements the slight brightness and edgy sound of the
Class D amplifier. It tends to make everything softer, smoother, and
accurate. Given that the function of the amplifier, Wyred 4 Sound's
input stage (buffer) has unity gain (no gain produced), and is ultra
transparent.

Modifications are made to the modules in
every amplifier to enhance their performance. Critical input coupling
caps are bypassed to allow audio to freely flow through while still
allowing for DC protection, and “beef-up” the servo (feedback) circuit
for enhanced bottom-end extension. Every module is connected to the
binding posts with 14AWG 99.9% OFC high strand pure copper paralleled
with 14AWG high strand PURE silver wire.

One of the outstanding traits of all Wyred 4
Sound power amplifiers is exceptional imaging and soundstage rendition:
uncommon in depth and height.

REVIEWS:

“I bought a 4-CH amp for use with my
CS2's. It has two 250W modules and two 125W modules. I have not had a
chance to hook up the CS2's with it yet as I am still scrambling to find
my extra XLR cables, but I AM running the 250W modules to drive my
Greybeard KB/3/3's 4ohm nominal (90dB) and 20-20Khz flat response. These
things are FANTASTIC. Also, at $2495 for a 4CH amp with THAT much
power, you really can't go wrong. As far as listening goes, so
far, with my big Greybeards being driven by only 2CH of the amp, via the
250W modules, I am VERY impressed. Bass is thunderous and controlled.
Highs sparkle with no fatigue and the noise floor is non-existent! We
are driving the amp with our own tube equipment. Highly recommended!!!" – Dan W. President, ModWright Instruments Inc.

“I had opportunity to audition a Wyred 4
Sound ST-250. It is one of the best sounding solid state amps I have
heard. It has detail without harshness and is not dull either. It has a
rich midrange and analog sound, yet is more accurate and has less noise
than tube amps. However, to me, it did not offer the full richness of a
live performance like a tube amp like my Cayin can. Nor does any other
solid state amp by me preferences have that 3 dimensional quality of the
sound. However, with the Joule tube preamp feeding in to it, the Wyred 4
sound amp sounded remarkably good – and by my memory it bested my
Musical Fidelity Nu Vista amp that I owned years ago as the Wyred seemed
less fatiging and more analog sounding. I know of several people who
like a hybrid tube pre with a solid state amp who gave up their tube
amps for the Wyred. Considering the great price of the Wyred, less
maintenace issues and the cost of tubes, and how respectably close it
comes to the sound of a tube amp, it remains a tempting tube amp
alternative and a wonderful first choice for a solid state amp.