The Bryston 7BSST2 monoblock power amplifiers are among the world's finest amplifiers in their class, or above. Extremely powerful (at 600 wpc into an 8-Ohm load, or 900 into a 4-Ohm load) they are nevertheless adept and musical, able to handle either a solo voice or an entire orchestra at full tilt. Despite this power, they are also reasonable in size and weight, and in my situation (placed in the open, on amp racks) ran at worst warm to the touch. They are real-world audiophile class amplifiers. I have run them on Thiels, B&W Nautili, Aerials and Magnepans and they've sounded superb (and neutral) in each case. Connections are single-ended (RCA pin-plugs) and balanced (XLRs), speaker outputs are shielded 5-way binding posts. A 12v automatic turn on/off terminal block is provided as well for convenience. The amplifiers are in Black, with the 19" face and handles. Condition is mint or a "9" on Audiogon's spec, and the amplifiers have always been used in a dedicated, non-smoking, non-pet environ. I am the original owner, and manuals and original boxes are included. I am a long-time Audiogoner and a verified paypal member. I will ship FedEx or UPS and accept payment by paypal (split fee), bank transfer or certified check after verification.
From Bryston's website:
Ensures Sonic Superiority
From input to output, all the circuitry in the SST2 C–Series of
amps has been optimized for the most accurate performance
possible. All analog signal circuitry is fully discrete to avoid
the compromises, phase shift, and non-linearities inherent in
IC’s. The Bryston SST2 C–Series2 amplifiers incorporate an
innovative gain stage topology, which yields a substantially
lower noise floor through the use of low-impedance
pathways within the amplifier, and has strong advantages
in reducing overall distortion. Bryston’s computer controlled
distortion analyzers confirm that IM distortion of less than
10 parts per million (below 0.0009%) are typical for this
new circuitry. All SST2 amplifiers use Bryston’s proprietary
output stage, which we call “Quad-Complementary.” The
Quad-Complementary topology improves linearity to a new
standard of accuracy, while virtually eliminating aggressive
higher harmonic distortion products. The overall harmonic
distribution of Bryston’s Quad-Complementary output stage
closely approaches an ideal Class-A output, except that the
overall distortion is actually much lower. (True class-A output
stages suffer from relatively high current-induced distortion
levels, consisting of mostly lower-order harmonics). The
listening characteristics display a high degree of transparency
without harshness or grain. The annoyances previously ascribed
to ‘transistor sound’ are absent, and the amplifier seems to
combine the seductive lushness of tube equipment with the
focus and accuracy of solid-state.
Bryston’s research has shown that separate power supplies
provide the best imaging, clarity, and dynamic range — all
attributes that are especially crucial given the emerging
and demanding high resolution digital sources. The power
supplies employ multiple filter capacitors per channel, rather
than single pairs of larger filter cans, allowing improved high
frequency response, and reducing overall losses in the supply.
In the 9B SST2, and 6B SST2 models we carry the modular
concept further, making the channels removable.
We use only the finest components — such as 0.1% metalfilm
resistors, polypropylene capacitors, custom-wound
toroidal transformers, and hand-matched transistors — to
reduce noise and distortion to the absolute minimum. Goldplated
balanced or single-ended (RCA) input connectors are
standard as well as gold-plated 5-way loudspeaker binding
posts, to eliminate possible causes of distortion from
corrosion. As befits products intended for use on stage as
well as in the home, the SST2 chassis are extremely robust.
flexibility & Features
SST2 amplifiers offer feature flexibility. For example, all
allow a choice of input connection — balanced XLR-F,
balanced 1/4” phone, or single-ended RCA jack — together
with a switch to select gain settings. A trigger input allows
system-wide on/off control. Overall, the SST2 Series itself
facilitates flexibility in putting together the total system
through a variety of channel and power output options.
Although the description of circuit innovations can indicate
the research and commitment we bring to the design and
manufacturing of our products, it’s not the whole story. The
purpose of all this technology is to place you within the scene
of the movie, or to transport you to the actual musical event.
Whether you can experience all the drama, movement, and
emotions intended is the one truly meaningful measure of
any audio/video system. Take the time to visit your Bryston
dealer and audition our SST2 Amplifiers. We think that
you’ll rediscover how exciting audio can be.
7B SST² C–SERIES
The 7B SST2 single-channel amplifier employs a
balanced-output design that reduces THD and IMD
to unprecedented low values (typically 0.001% or less).
With a low noise floor (typically below -118dB) and
excellent signal tracking characteristics (slew rate of 120
Volts per microsecond), the 7B SST2 monoblock assures
a new degree of transparency, musicality, and ease of
listening. Capable of delivering a truly prodigious 600
Watts continuously into 8 Ohms, and with tremendous
power reserves, the 7B SST2 offers virtually perfect
freedom from overload on any type of speaker or music.
SPECIFICATIONS AVAILABLE TO ALL SST² AMPLIFIERS
Distortion 110dB below rated output @ 29dB gain (-75dBu)
>113dB below rated output @ 23dB gain (-78dBu)
>116dB below rated output @ 17dB gain (-78dBu)*
*setting available on models 6B & 9B only
Slew rate Greater than 60 volts per microsecond
Power bandwidth From less than 1 Hz to over 100 kHz
Damping factor Over 300 at 20 Hz, ref. 8 Ohms
Input Impedance 2B, 3B, 4B, 6B, 9B - 50k Ohms single ended, 40k Ohms balanced
7B, 14B, 28B - 15k Ohms single ended, 20k Ohms balanced
19 in./48.3 cm wide rack
mount version (with handles)
Mounted rack depth
17 in./43.2 cm wide shelf
mount version (without handles)
19 x 5.25 x 17.25 in.
48.25 x 13.3 x 43.8 cm
15.75 in./40.1 cm
17 x 5.25 x 15.75 in.
43.2 x 13.33 x 40.1 cm
55 lbs/25 kg