SpeakerCraft Refurbished SC12-30 12-channel multi-room power amplifier 12-channel amplifier power output: 30 watts RMS per channel into 8 ohms, all channels driven 40 watts RMS per channel into 4 ohms, all channels driven adjacent channels are bridgeable to 80 watts RMS into 8 Ohms, all channels driven massive toroidal transformer design delivers solid, deep, controlled bass response advanced PCB construction ensures extremely high channel-to-channel isolation high-quality parts and oversized heat sinks for clear and uncolored sound signal-to-noise ratio: greater than 89 dB (20-20,000 Hz) frequency response: 20-20,000 Hz (-3 dB) total harmonic distortion: 0.2% (20-20,000 Hz) BusMatrix Selector allows one of four audio options to be assigned to each channel: left, right, left plus right (summed stereo), or the channel's own dedicated signal input independent level controls for all 12 channels three turn-on modes: music sense, voltage trigger, and manual gold-plated 5-way binding post speaker connectors accommodate up to 12-gauge wire or banana plugs cascade outputs for "daisy-chaining" amplifiers independent thermal and short-circuit protection circuits for each channel rack mount ears included detachable AC power cord 17-1/4"W x 5-3/4"H x 17-9/16"D weight: 35 lbs.