I use 2 of these amps as "mono blocks" for stereo speakers, I have not used them to power the subwoofer. I had no background noise (even with the amp cranked all the way up) and the sound quality is very good. I would say the same as most normal receivers but definitely a notch below NAD etc as you would expect. Delivery was as promised. My connection: optical output from computer to DAC - RCA DAC outputs to NOBsound amplifiers - each amplifier is connected to the speaker with speaker cables. NOBsound amplifiers have two RCA inputs on the back, but they work well with one too.
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