The Bryston 7B³ is a single channel (mono) amplifier which offers virtually perfect freedom from overload on any type of speaker. It assures an amazing degree of transparency, musicality, and ease of listening.Power Capabilities:600W into 8Ω900W into 4ΩFeatures:Active extremely low distortion input bufferBalanced and Single Ended audio inputsSelectable gain at 23 or 29dBRegulated power supplies to all voltage gain stagesConvection cooled and housed in a fully aluminum chassis.No fans or other moving partsEnergy storage power transformers maximize dynamic rangeSpecifications:Harmonic Distortion: ≤.005% from 20Hz to 20kHz at 600WNoise below full output: -113dB single ended, -116dB balancedSlew Rate: >60V/µSPower Bandwidth: .5Hz to >100kHzDamping Factor: >300 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)