AudioSource Amp One/A 160-Watt Stereo Power Amplifier with Internal Bridging 160-watt stereo amp (80 watts x 2) with switchable 200-watt mono option Line-in jacks connect to such sources as receivers, CD players, or preamplifiers Line-out/thru jacks for creating powerful multi-amp setup; requires preamp 20 Hz to 20 kHz frequency response and total harmonic distortion of 0.04 percent Measures 16.5 x 2.38 x 11.62 inches (W x H x D); 2-year warranty