Front Panel

3Bsst & 4Bsst POWER AMPLIFIERS

1. 'SST POWER' switch

The front panel label 'SST POWER', is a touch sensitive membrane switch used to apply or remove a/c line power to the soft start circuitry. Push firmly the center of the switch until the power-up sequence begins. Push again and the amplifier will power-down. ( Note: the rear circuit breaker must be on for the amplifier to power-up)

2. LED Indicators

Each SST channel has a LED indicator to monitor the following conditions:

Unlit	-	indicates channel has no power.
Red -		indicates channel is muted (power-up)
Green	-	indicates channel operation is normal.
Flashing Red -		indicates channel clipping.
Orange -		indicates channel thermal shutdown.

Power up sequence

After pushing the 'SST POWER' switch, each channel LED will turn from unlit to red (mute). When the power supplies have stabilized the channel will come out of mute and the LED will change to green (normal operation).

Unlit LED ( No power )

The SST channel LED when unlit indicates no A/C mains power is present at the channel. If both channel LED indica- tors are unlit the amplifier probably needs only to be powered on.

Clipping ( flashing red )

Clipping occurs when the channel output level no longer can follow the level increase at the input (Overdriven input condition). When an SST channel is driven into clipping the channel LED will change from green to red then back to green when the level is reduced ( Flashing Red ). Momentary clipping can be tolerated, however it indicates that maxi- mum un-distorted power has been surpassed and potential speaker damage may result if overload conditions persist. Any amplifier that is constantly operated into clipping indicates a more powerful amplifier is needed for that application.

Thermal Shutdown ( orange )

Each channel has thermal shutdown circuitry to prevent damage due to overheating.

Should thermal shutdown occur, the channel will mute, and the channel LED will turn orange indicating this condition. When the channel has cooled to a safe operating condition the channel will return to normal operation. Persistent Thermal shutdown indicates steps need to be taken to increase airflow across the channel or channels heat sink. ( Also see installation section on ventilation ).

3BSST, 4BSST specifications

The Bryston 4BSST and 3BSST are exceptional power amplifiers that embody the premium quality and performance standards synonymous with the Bryston brand. Renowned for their robust build and superior audio fidelity, these amplifiers are designed for both audiophiles and professionals who demand excellence in sound reproduction.

The Bryston 4BSST is a higher-powered model capable of delivering 300 watts per channel at 8 ohms and easily transitioning to 500 watts per channel at 4 ohms. This amplifier is perfect for driving larger speakers and creating a more dynamic listening experience. The 3BSST, on the other hand, provides a slightly more reserved output of 150 watts per channel at 8 ohms and 250 watts at 4 ohms, making it an excellent choice for smaller systems without compromising on sonic clarity.

One of the key features of both models is the SST (Special Serial Technology) Mosfet output stage, allowing for rapid response times and low distortion rates. This technology ensures that the audio signal remains clean and clear, even at high volumes. The amplifiers employ an innovative parallel push-pull output design, which not only bolsters dynamic range but also enhances the overall soundstage.

In terms of construction, Bryston amplifiers are built to last. The chassis is made from heavy-gauge steel with a baked enamel finish that not only provides a sleek and professional appearance but also contributes to overall durability. Moreover, the 4BSST and 3BSST feature a unique thermal management system that uses extensive heat sinks to maintain optimal operating temperatures, thus ensuring reliability during prolonged use.

Another significant characteristic of both amplifiers is their low noise floor. This trait is particularly important for high-resolution audio systems, as it allows for more subtle details to come through, providing an immersive listening experience. They also include Bryston’s signature 20-year warranty, reflecting the company’s commitment to quality and customer satisfaction.

For connectivity, both models provide balanced XLR and unbalanced RCA inputs, accommodating a variety of audio sources and setups. Their simple, clean interfaces make them user-friendly while still providing the performance flexibility that seasoned audio enthusiasts seek.

In summary, the Bryston 4BSST and 3BSST amplifiers exemplify the pinnacle of audio engineering, showcasing an unmatched blend of power, clarity, and durability. Whether you are setting up a high-end home theater system or a professional studio, these amplifiers are equipped to deliver exceptional sound quality for years to come.