Amplifier works & when connected to subwoofer it’s very loud & nice quality but there is a slight electrical hum when it’s idling & Auto on / off thumps. Possible capacitor / switch issue SPECIFICATIONS: Rated Power Output: 156 watts RMS into 8 ohms @ 0.1% THD 252 watts RMS into 4 ohms @ < 1.0% THD Signal to Noise Ratio: 90 dB A-weighted Effi ciency: 66% Input Impedance: 10.4K ohms Bass Boost: Switchable, 6 dB @ 35 Hz Low Pass Adjustment: 40 Hz – 180 Hz Phase Adjustment: 0° (NOR) or 180° (REV) Dimensions: 9-13/16" W x 9-13/16" H x 5 D Enclosure Cutout: 8-1/2" x 8-1/2" Power Requirements: 115/230 VAC, 60 Hz/50 Hz, 400W Stand-By Power Rating: 115, < 0.29W* Weight: 11.7 lbs
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