I'm a DJ, well more like mp3J, and recently I tried using the USB out on my laptop to send the signal instead of the 1/8" soundblaster headphone jack. I bought a ART USB Dual Preamp so that I can go out of my laptop's USB out, into the USB in on the preamp, and then the preamp has two 1/4" outs, and then I have 1/4" to RCA cables that go from the preamp into my Pioneer DJM 600 board which has RCA inputs. I was using a Presonus StudioLive board before and I think this preamp might have burned up one of the channels on that board because it worked brilliantly for the first week or two that I had the new USB preamp, then the channel that I had it plugged into stopped working. I hooked the preamp up to the Pioneer board last night, worked brilliantly, then tonight I noticed sound was only coming out of the right speaker. So I switched channels and BAM both speakers worked perfectly. Could my preamp be burning up the channels on my boards? If so, can you help me to understand exactly why? Is it the wrong application? Wrong cables? Too much gain on the pre? Please help!!!