Bryston 9B SST Home Theater Amplifier - 140W x 5 Into 8 Ohms

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General:
The 9B SST is a five-channel power amplifier that can produce 140 watts per channel into eight ohms, and 200 watts per channel into four-ohm speaker loads.

If you look closely at the specs of most theater amps, many are incapable of producing the full rated output to all channels at the same time which is a huge compromise for a high-end theater setup.

No compromises in design, quality, or total output here.

Super nice condition with just a few scuffs or light dings.

Fully tested here at SkyFi and working as it should on all 5 channels. One channel was just serviced by Bryston.

Brand Background:
Bryston Ltd. is a Canadian company which has been designing and manufacturing audio equipment for over 35 Years. While there are many companies competing in their market, Bryston’s gear is coveted by enthusiasts and professionals alike. They have earned the reputation of providing bullet-proof reliability, high performance and value. 

Ownership:
Single Owner

Connections:
RCA, XLR and 5 Way Binding Posts

General Sound:
Neutral sound with little to no coloration

Cosmetic Condition:
7/10 = Good. One or two minor scratches. Well Maintained.. See our detailed rating description here.

Working Condition:
Working perfectly and tested in our lab and listening room.

Included:
Just the unit and power cord.

Packing:
Will be packed using our highly developed in-house process and custom packing materials.Specs:

Solid State / Tubed Solid State

Number of Channels 5

Power 120 Watts / Channel @ 8 Ω(1), 200 Watts / Channel @ 4 Ω(1)

Power Bandwidth < 1 Hz to over 100 kHz(1)

Slew Rate > 60 Volts per microsecond(1)

Total Harmonic Distortion < 0.005 %, 20 Hz - 20 kHz @ 120 Watts into 8 Ω(1)

< 0.007 %, 20 Hz - 20 kHz @ 200 Watts into 4 Ω(1)

Intermodulation Distortion < 0.005 %, 20 Hz - 20 kHz @ 120 Watts into 8 Ω(1)

< 0.007 %, 20 Hz - 20 kHz @ 200 Watts into 4 Ω(1)

Noise > 110 dB below full output 29 dB gain(1)

> 113 dB below full output 23 dB gain(1)

> 116 dB below full output 17 dB gain(1)

Sensitivity 1.1 Volts = 120 Watts @ 8 Ω (1 Volt position)(1)

2.2 Volts = 120 Watts @ 8 Ω (2 Volts position)(1)

4.4 Volts = 120 Watts @ 8 Ω (4 Volts position)(1)

Input Impedance 50k Ω unbalanced(1)

20k Ω balanced(1)

Damping Factor > 500 @ 20 Hz, ref. 8 Ω

Power Consumption and Heat Load At idle: 192 Watts(1)

Single channel: 120 Watts @ 8 Ω: 242 Watts(1)

5 channels: 120 Watts @ 8 Ω: 1397 Watts(1)

Single channel: 200 Watts @ 4 Ω: 422 Watts(1)

5 channels: 200 Watts @ 4 Ω: 2295 Watts(1)

Dimensions (W x D x H) 19 x 19 x 5.25(1)

48.3 x 48.3 x 13.3 cm(1)

Weight 62 lbs.(1)

28 kg.(1)

Weight:

Kimber Kable - RCA Interconnects - Better

Kimber Kable - RCA Interconnects - Best

Kimber Kable - BALANCED XLR Connectors - Better

Kimber Kable - BALANCED XLR Connectors - Best

Kimber Kable - Speaker Cables - Better

Kimber Summit Series Monocle XL Speaker Cables (PAIR) - Best

Kimber Summit Series BiFocal XL Bi-Wire Speaker Cables (PAIR) - Best If Applicable 

Kimber Kable - Power Cords - Better

Kimber Kable - Power Cords - Best

We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR.

If the amplifier passes visual inspection, we move on to a controlled power on sequence using a Sencore safety analyzer to monitor current draw in real time. Once the amplifier is determined to be safe to operate, we connect it to full AC mains for function and power testing. We connect the speaker outputs of the amplifier to a Sencore PA81 Power Analyzer which acts as a dummy load, DC offset monitor, and oscilloscope interface. We start with a low level 1KHz test signal at the amplifier’s input and slowly increase its amplitude while monitoring the output on an oscilloscope for signs of noise, clipping, distortion, or improper channel balance. We continue increasing the signal level until the amplifier reaches clipping. At this point we take an output power measurement and compare it to the spec sheet of the amplifier to verify proper performance. If the device under test has both balanced and single ended inputs they are both tested at this time. We finish off the bench evaluation with a 1KHz square wave check and a 20Hz to 20KHz sine sweep to assess the amplifier’s frequency response characteristics. This battery of tests will usually reveal if the amplifier has any issues that need further attention.

Before the device leaves the bench, we perform a listening test with actual music using a variety of preferred test tracks. Our benches are outfitted with familiar monitor speakers which help us identify inconsistencies that will not always show up on our test gear. The main things that we are listening for are hum or noise with no signal present, proper center image, clicks, pops, or any other obvious undesirable audio characteristics.

If the unit passes all of these tests it is moved to our long term testing rig where we simulate real word operating conditions for 6-8 hours. This allows us to monitor the unit for signs of thermal runaway or intermittent issues that only crop up when the unit has fully come up to temperature.