I just received my AudioSource pre one/a preamp in the mail. Anxious, I hooked everything up (correctly) and immediately noticed noise coming from my speakers, which resembled speakers that had damaged voice coils. How could this be? I tried another set of speakers, and the same result occured. Not believing it could be the brand new preamp, I had one more card up my sleeve. I hooked up my Koss Pro4/AA's via a y-connector out of one set of preamp outs on the back of the AudioSource preamp. To make a long story longer, after finishing this review, I'm shipping this lemon back! BOO- AudioSource! P.S.- I reluctantly gave this item 1 star, but I guess that's where the scale starts! David Ramos, Tehachapi, California