This probably needs recapping . On channel is fine but other is noisy. Selling as is This Bryston 4BST Stereo Amplifier is a powerful piece of audio equipment capable of delivering up to 250 watts per channel at 8 ohms or 400 watts per channel at 4 ohms. It has two inputs and two outputs, making it suitable for a variety of audio setups. The amplifier is black in color and was manufactured in Canada. The model number is 4B-ST, and it is designed specifically as a power amplifier for use in a home audio system. It is important to note that this item is being sold for parts or not working, so please take that into consideration before making a purchase. Despite its condition, it is a high-quality amplifier that is sure to enhance any audio setup.

Solid-state stereo power amplifier. Output power: 250W continuous into 8 ohms (24dBW), 400Wpc rms continuous into 4 ohms (23dBW); 800W continuous into 8 ohms in bridged mode (29dBW). Current delivery: 16A continuous, 48A peak, per channel. Frequency response: 1Hz100kHz, 3dB for 1W output. S/N Ratio: hum and noise, 108dB below rated output, 90dB IHF. Input sensitivity: 1.4V for 250Wpc into 8 ohms. Voltage gain: 30dB. THD+noise: 20Hz20kHz, 0.01%. IM distortion (60Hz+7kHz, 4:1, SMPTE method): less than 0.01% at rated power. Damping factor: greater than 500 at 20Hz, at 8 ohms (equivalent to an output impedance of less than 0.016 ohms). Input impedance: 50k ohms unbalanced, 30k ohms balanced. Polarity: non-inverting. Dimensions:16 3/16 (411mm) W by 7 1/8 (181mm) H by 13 (343mm) D. Weight: 40.1 lbs (20.2kg) net.

Solid-state stereo power amplifier. Output power: 250W continuous into 8 ohms (24dBW), 400Wpc rms continuous into 4 ohms (23dBW); 800W continuous into 8 ohms in bridged mode (29dBW). Current delivery: 16A continuous, 48A peak, per channel. Frequency response: 1Hz100kHz, 3dB for 1W output. S/N Ratio: hum and noise, 108dB below rated output, 90dB IHF. Input sensitivity: 1.4V for 250Wpc into 8 ohms. Voltage gain: 30dB. THD+noise: 20Hz20kHz, 0.01%. IM distortion (60Hz+7kHz, 4:1, SMPTE method): less than 0.01% at rated power. Damping factor: greater than 500 at 20Hz, at 8 ohms (equivalent to an output impedance of less than 0.016 ohms). Input impedance: 50k ohms unbalanced, 30k ohms balanced. Polarity: non-inverting. Dimensions:16 3/16 (411mm) W by 7 1/8 (181mm) H by 13 (343mm) D. Weight: 40.1 lbs (20.2kg) net.