Note: this is a MONO channel amplifier.The chassis is rock-solid and overall it weighs a ton, bring a vehicle. I purchased this amplifier as a package deal with some other equipment (I was after something else). Would rather not see it go, but now I have too many amplifiers and not enough space. Specs: -Rated Output Power: 125W (continuous) -Total Harmonic Distortion: Less than 0.5%, 20 to 20,000 Hz at full rated output -Frequency Response: ±1 dB, 20 to 20,000 Hz at full rated output -Input Sensitivity: Hi-Z, 500mV; Lo-Z balanced, with optional transformer,150mV -Hum and Noise: 90 dB below rated output -Output Loads: 4 ohms, 8 ohms, 25V, 25VCT, 70V -Output Regulation: Better than 2 dB from no load to full load -Input Impedances: Hi-Z, 50k ohms unbalanced; Lo-Z, 600 ohms, balanced or unbalanced, and 1:1 bridging with optional plug-in transformers https://www.bogen.com/sites/default/files/2021-01/hta_series_specsheet.pdf