Hi all, I haven't posted here before, but hopefully somebody can help me out. My band and I use a PreSonus Firestudio 26x26 to track demos and also as a software mixer when we practice, to avoid the hassle of setting up a PA. For monitors we just run wireless in ears out of the outputs, but for some reason we have a huge amount of noise in the signal doing this, almost to the point of making it completely impractical. We figured we'd get around the problem by buying a 4 channel headphone amp and all running headphones or wired in ears, so I began looking around for a suitable amp. I know what I want and I was very surprised to learn that none of the commonly known (to me at least) headphone amps do it! What I want is: 4 channel headphone amp, rackmountable, each channel with its own stereo input. This would be better as a 2x mono than a single TRS, as otherwise I have to make up 4 Y cables. I also want this input to be on the BACK of the amp, so that I can just patch it all in in the rack and not have to unpatch and coil up 8 leads every time i want to put the lids on the case and take it somewhere else. Does anyone know of such an amp? Even better, does anyone know why we had such problems using wireless transmitters, and how we might go about fixing it? Thanks in advance!