Fig 1

9BSST FIVE CHANNEL POWER AMPLIFIER

Rear Panel Input / Output Connections

1. Input Select Switch.

Each 9BSST channel gives the user the option of switching between either balanced input or single ended input.

2. Balanced Input connector. ( Imp. 20k )

This input connector accepts standard ‘XLR’ or 1/4” TRS .

Use quality, 100% shielded cables with gold plated connectors.

‘XLR’ type

‘TRS’ type

‘RCA’ type

3. Single Ended Input. ( Un-balanced input ) ( Imp. 50k )

This input connector accepts standard ‘RCA’ or ‘Phono’ connectors. Use quality, 100% shielded cables with gold plated connectors.

Balanced input Vs Single ended input:

The balanced input requires a balanced pre-amp source. Balanced systems provide noise protection from external electrical interference, so cable length can be very long (50m or longer ).

The single ended or unbalanced input is provided for pre-amps without balanced output. Single-ended cables should be kept to 20’ (7m) or less. In general never use longer cables than necessary, never coil excess cable length, and run sig- nal wires away from AC power or speaker cables.

4. Polarity Switch ( 0 or -180 degrees)

Each 9BSST channel gives the user the option of inverting the polarity of the input signal -180 degrees. Polarity inversion is application specific. The normal operating position is 0 degrees.

5. Input Sensitivity (Gain) Switch.

The optimum gain setting will depend upon the source pre-amp operating level, and or personal preference.

The 1v setting is used when the source is single-ended, or from a transformer coupled balanced source. This is the home theatre setting for single ended or un-balanced operation.

The 1v setting provides the most amplifier gain - 29 dB. (1v in = 100w @ 8 ohms.) (noise -110 dB) A signal level of 1.1v at the input is required to deliver 120W into 8 ohms (rated output).

The 2v setting is used when the sources output is actively Balanced.

This is the home theatre setting for balanced operation Or use this setting with any systems where the volume control rotation is limited to the bottom half of the control or less.

The 2v setting provides an amplifier gain - 23 dB. ( 2v in = 100w @ 8 ohms.) ( noise -112 dB ) A signal level of 2.2v at the input is required to deliver 120W into 8 ohms (rated output).

The 4v setting is used when the source pre-amp has a high output level, or in ultra sensitive systems where the volume control rotation range is still limited when using the 2v setting.

Some pre-amps may be unable to deliver enough level to use this setting.

The 4v setting provides an amplifier gain - 17 dB. ( 4v in = 100w @ 8 ohms.) ( noise -115 dB ) A signal level of 4.4v at the input is required to deliver 120W into 8 ohms (rated output).

The noise is referenced in dB below rated output of 120 watts. Different input configurations result in slightly different noise readings. The above noise ratings represent minimum readings, actual readings may be better.

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Bryston 9BSST owner manual Rear Panel Input / Output Connections
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9BSST specifications

The Bryston 9BSST is a revered powerhouse in the realm of high-end audio amplification, offering audiophiles an unmatched listening experience through its impressive technical specifications and robust build quality. Esteemed for its pure, accurate sound reproduction, the 9BSST serves as a benchmark for solid-state amplifiers.

One of the standout features of the Bryston 9BSST is its power output, delivering 300 watts per channel into 8 ohms and 500 watts into 4 ohms, making it versatile enough to drive a wide array of loudspeakers. This substantial power ensures that even the most demanding speakers are adequately supported, capable of producing deep, thunderous bass alongside pristine high frequencies.

The amplifier is constructed with Bryston's legendary attention to detail and durability. Its all-steel chassis not only provides a rigid structure but also helps in minimizing electromagnetic interference, contributing to the overall audio purity. The 9BSST is also known for its warm, transparent sound signature, which can be attributed to its well-engineered Class AB topology. This design strikes an excellent balance between delivering high power and maintaining low distortion levels.

Moreover, the 9BSST incorporates advanced thermal management systems, including large heat sinks and robust cooling fans, ensuring reliable performance during extended listening sessions. This prevents overheating, which can adversely affect performance and longevity. In terms of connectivity, the amplifier comes equipped with balanced XLR and unbalanced RCA inputs, providing flexibility in system integration.

Bryston amplifiers are also recognized for their longevity, a feature reinforced by their impressive 20-year warranty. This commitment to quality is indicative of the brand’s confidence in their products. In addition, the 9BSST includes Bryston's unique "low-frequency cutoff" feature, which protects speakers from potential damage caused by high power surges at lower frequencies.

Overall, the Bryston 9BSST encapsulates the perfect synergy of power, precision, and reliability. Its robust engineering and exceptional sound quality make it a favorite among audiophiles and music professionals alike, solidifying its status as a top-tier choice in the high-end amplifier market. With its rich history and dedication to performance, Bryston continues to set the standard for high fidelity audio.
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