80 watts x 2 channels into 8 ohms (20-20,000 Hz) at 0.007% THD 80 watts x 2 channels into 4 ohms (20-20,000 Hz) at 0.007% THD 4-ohm stable for use with a wide range of speakers PowerDrive™ circuit with automatic speaker impedance sensing delivers maximum dynamic power output regardless of speaker load Soft Clipping™ circuit gently limits amplifier power output to reduce risk of speaker damage due to prolonged high volume operation Modular Design Construction (MDC) to allow the addition of the pp-... phono stage or other MDC Modules toroidal power transformer rotary bass and treble controls with defeat switch for tone control bypass 7 RCA audio inputs including 2 tape in/outs tape monitor loop for adding an equalizer or signal processor front-panel minijack input for connecting a portable music player main-amp input and 2 preamp outputs for connecting a powered subwoofer or separate amplifier for bi-amping full-size headphone jack front-panel switching for 2 pairs of speakers two pairs of speaker binding posts RS-232 port for operation with third-party controllers 12-volt trigger output IR input/output one switched AC convenience outlet detachable  remote control Line In, Speaker Out Continuous output power into 8 ohm and 4 ohm (Stereo): >80W (at rated THD, 20Hz-20kHz, both channels driven) THD* 20 Hz - 20 kHz, CCIF IMD, SMPTE IMD, DIM 100: 90 W (at 1kHz 0.1% THD) IHF Dynamic Headroom: 8 Ohms, +2.6 dB; 4 Ohms, +4.4 dB IHF Dynamic Power: 8 Ohms, 145 W; 4 Ohms, 220W; 2 Ohms, 290W Signal / Noise Ratio: >92 dB (IHF; A-weighted, 500 mV input, ref. 1W out in 8 ohm); >110 dB (IHF; A-weighted, ref. 80 W in 8 ohm, max. volume) Frequency Response: ±0.3dB (20Hz-20kHz, Tone Defeat ON), 10 Hz - 65 kHz (-3dB) Channel Separation: 1 kHz, >80 dB; 10 kHz, >68 dB Power Consumption Standby Power Idle Power: