I take it you want a stereo volume control knob, right? ... Is that correct?If what you don't like about your current receiver is a constant low level hiss, then these two amps from Amazon may be no better.[ I've never seen independent test reports that measure that for either of them, and I never trust manufacturer's specs.] Or when you say "noise" do you mean a symptom the current unit has developed over time? [Which could mean the volume knob simply needs a contact cleaning spray session]
It would appear both amps you linked in your OP are the same unit with different branding. At least one other company sells that same amp on Amazon but with different knobs for $10 more:http://www.amazon.com/Russound-X75-2-Chann..._cmu_pg__headerNote what the reviewers say about plugging your primary listening source into "Input 2". For $90 how can you go wrong? Anyway, if you don't like it, you can send it back -- it's Amazon.