This amplifier can deliver 75 watts into 2 channels, or 150 watts into 8 ohms when set to bridge-mono mode. A built-in, switchable low-pass filter makes this a great subwoofer amp and full range line-level outputs allow for bi-amp configurations. Key features of the APA150 are high current, discrete power transistors, toroidal power supply transformer, low-noise forced air cooling, a fully adjustable and defeatable electronic 50-150 Hz low-pass filter (18 dB/octave) and complete protection against electrical shorting and thermal overload. Also included is auto-on/off, silent turn-off with no audible transient, gold plated RCA inputs/outputs and 5-way binding posts.