I recently got a Duet (found a good deal on eBay, which I may now regret) and so far I have loved it. Like many, it was more than I initially wanted to spend but the sound quality is amazing and the mic pre's are good enough that I saved myself the cost of getting a preamp so I felt that I came out a head. I sat down to record a couple of voice over samples this morning and was blown away by a ton of noise. At first I thought it was just because I was recording at my desk without any sound isolation but then I realized I was listening to the "wrong" channel--the one without the mic plugged in. Concerned, I switched to the channel with the mic and the same self noise was there. I tried unplugging everything so it was just the MBP and the Duet (no mics, no imputs, no outputs--just the breakout attached and my headphones) and both channels still get this horrendous self-noise. Through some experimentation I learned: Channel one seems to be lounder than channel two (slightly) switched phantom power on and off will momentarily silence the sound but then the noise comes back the more gain the louder the noise (this may be obvious) I went back and listened to old recordings with the Duet and there is none of this noise. I am at a loss. Any suggestions/help would be greatly appreciated.