The Bryston 4B³ is a dual channel (stereo) amplifier which is acclaimed internationally as being suited for the finest and most sophisticated sound systems. It is currently our most popular Cubed Series model.Power Capabilities:300W into 8Ω500W into 4Ω900W into 8Ω (Bridged Mono)Features:Active extremely low distortion input bufferBalanced and Single Ended audio inputsSelectable gain at 23 or 29dBRegulated power supplies to all voltage gain stagesIndependent power supplies for each channelConvection cooled and housed in a fully aluminum chassis.No fans or other moving partsBridging switch configures amplifier into a single 900W ChannelSpecifications:Harmonic Distortion: ≤.005% from 20Hz to 20kHz at 300WNoise below full output: -110dB single ended, -113dB balancedSlew Rate: >60V/µSPower Bandwidth: .5Hz to >100kHzDamping Factor: >500 at 20Hz (8Ω)Switchable Gain: 23dB or 29dBOptions:Available with silver or black faceplate (3U + .55”)17” (without handles) or 19” (with handles) faceplate available (non-rack mountable)