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Power amplifiers mono — Bryston 28B Cubed
Description, images, technical data and specifications
Bryston 28B Cubed
Image source — © Bryston
The 28B Cubed is a large mono power amplifier from Bryston, built for exceptionally high output into demanding loudspeaker loads. This model represents Bryston's most ambitious mono amplifier engineering within its Cubed range, built for the largest rooms and most demanding loudspeaker loads the brand's catalogue addresses.
Position in line
It sits above the 7B Cubed in Bryston's Cubed power amplifier range, among the highest-output models the brand makes. As the top mono amplifier in Bryston's current Cubed lineup, the 28B Cubed likely represents the fullest expression of the brand's engineering ambition for a single-channel amplification stage.
Key specs that matter
Rated output is 1000 W into 8 ohms, nearly doubling to 1800 W into 4 ohms. Rated bandwidth is an unusually wide 1 Hz to 100 kHz. Signal-to-noise is 117 dB via XLR and 116 dB via RCA. Distortion is under 0.005%. At 42 kg it is a substantial, heavy monoblock, consistent with the exceptional output this amplifier is built to deliver.
Sound and use context
Expect an extremely controlled, high-headroom presentation - built for the most demanding loudspeaker loads and largest rooms in Bryston's catalogue, a serious performer for a system with difficult or low-sensitivity speakers.
Pairing
The 5000 ohm balanced and single-ended input impedance works with any modern preamplifier; the near-doubling into 4 ohms suits very demanding or low-sensitivity loudspeakers that would challenge a more modestly rated amplifier.
Alternatives
The 7B Cubed sits below this model in Bryston's Cubed range for less extreme output requirements, worth considering strongly unless a specific room or loudspeaker pairing demands the 28B Cubed's exceptional headroom. Given the exceptional 1000 W output rating, a dedicated or lightly loaded mains circuit is well worth arranging during installation to avoid any risk of nuisance breaker trips under demanding conditions. Bryston famously generous warranty terms extend across its full amplifier range, a reassuring detail for an investment at this level. Overall this remains an uncompromising choice for a room with the most demanding loudspeaker requirements. A qualified installer can also confirm the electrical supply is adequate for a system of this scale. Cable gauge should also be sized appropriately given the amplifier considerable current delivery.
Position in line
It sits above the 7B Cubed in Bryston's Cubed power amplifier range, among the highest-output models the brand makes. As the top mono amplifier in Bryston's current Cubed lineup, the 28B Cubed likely represents the fullest expression of the brand's engineering ambition for a single-channel amplification stage.
Key specs that matter
Rated output is 1000 W into 8 ohms, nearly doubling to 1800 W into 4 ohms. Rated bandwidth is an unusually wide 1 Hz to 100 kHz. Signal-to-noise is 117 dB via XLR and 116 dB via RCA. Distortion is under 0.005%. At 42 kg it is a substantial, heavy monoblock, consistent with the exceptional output this amplifier is built to deliver.
Sound and use context
Expect an extremely controlled, high-headroom presentation - built for the most demanding loudspeaker loads and largest rooms in Bryston's catalogue, a serious performer for a system with difficult or low-sensitivity speakers.
Pairing
The 5000 ohm balanced and single-ended input impedance works with any modern preamplifier; the near-doubling into 4 ohms suits very demanding or low-sensitivity loudspeakers that would challenge a more modestly rated amplifier.
Alternatives
The 7B Cubed sits below this model in Bryston's Cubed range for less extreme output requirements, worth considering strongly unless a specific room or loudspeaker pairing demands the 28B Cubed's exceptional headroom. Given the exceptional 1000 W output rating, a dedicated or lightly loaded mains circuit is well worth arranging during installation to avoid any risk of nuisance breaker trips under demanding conditions. Bryston famously generous warranty terms extend across its full amplifier range, a reassuring detail for an investment at this level. Overall this remains an uncompromising choice for a room with the most demanding loudspeaker requirements. A qualified installer can also confirm the electrical supply is adequate for a system of this scale. Cable gauge should also be sized appropriately given the amplifier considerable current delivery.
Specifications
Model name
28B Cubed
Input sensitivity (mV)
N/A
Input impedance (balanced) (Ω)
5000
Input impedance (single-ended) (Ω)
5000
Output impedance (balanced) (Ω)
N/A
Output impedance (single-ended) (Ω)
N/A
Max current (A)
N/A
Output power (8Ω) (W)
1000
Output power (4Ω) (W)
1800
Gain (dBu)
N/A
Frequency response low +/- 3dB (Hz)
1
Frequency response high +/- 3dB (Hz)
100 000
Signal to Noise Ratio (dB)
117 (XLR), 116 (RCA)
Total Harmonic Distortion + Noise (0% global feedback) (%)
N/A
Total Harmonic Distortion + Noise (100% global feedback) (%)
<0.005
Max power consumption (W)
N/A
Damping factor
N/A
Dimensions (mm)
430 х 206 х 467
Weight (kg)
42
Official link
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