SpeakerCraft BB275 2-Channel Amplifier 75W Stereo Power Amp The BB275 is a two channel amplifier that utilizes discrete high current design, which make it ideal for installations that require multiple speakers to be connected to a single amplifier. The high current designs also allow the amplifiers to reproduce and sustain deep bass. Multiple turnon modes, so the amplifier turns on automatically when the main system is switched on; Front mounted independent level controls allow you to balance the volume of each speaker to match the volume of the main system, which can vary greatly with different speakers and power ratings; and Pass through inputs to outputs, which allow multiple amplifiers to be daisychained together for multiroom applications and future expansion. The BB275 incorporates discreet power supplies to balance power between channels. A massive toroidal transformer assures adequate power reserves. Discreet output devices allow the amplifier to drive low impedance loads with very low distortion. Huge filter capacitors improve dynamics and lower IM distortion, while providing a sustained energy storage for low bass.