Hello, I have a problem involving a balanced signal and my M-Audio Omni Studio. I've been using the Omni Studio for a few months now. For the most part, I've been happy with it. The basic layout of the Omni is two inputs, Lines 1 and 2, with kind of non-so-impressive pre-amps. . . and two inputs without pre's, Lines 3 and 4. I have a stand-alone pre-amp has a convenient knob that lets me output either a mic-level signal or a line-level signal over the balanced XLR output. When I run a balanced mic-level signal to the XLR inputs of either Line 1 or 2's pre-amp, everything sounds sort of fine. However, when I run a balanced line-level signal through the TRS jacks of either Line 3 or 4, I get a considerable loss of bass signal among other tonal-differences (I'm recording a bass guitar). It really sounds to me like the Omni isn't handling the balanced signal correctly and there's inappropriate signal cancellations going on. Does anyone know what might be going on with Lines 3 and 4? I recorded the balanced output of my pre-amp as a stereo signal, and its output looks good, with the appropriate phase-shift between the two signals, so I'm assuming the problem is with the Omni. I really don't like the idea of going through the pre-amps of Lines 1 or 2. It's just adds noise and colors my signal unnecessarily. I bought the Omni with the idea that I would seriously put at least three of the lines to use. Is there any reason to believe that M-Audio paid more attention in designing the main lines of the Omni, and neglected inputs less likely to be used? If so, what other audio interfaces might someone recommend. I like the fact that units like the Omni have convenient montoring outputs, like phone outs. How do the Aardvark audio interfaces compare to M-Audio's? Aardvark seems to pride itself on it's noise-prevention, and that caught my attention. I'm looking for something that offers a similar configuration to the Omni, but without this balanced problem, maybe better ADCs, less noise, and more dynamic range couldn't hurt. I'm willing to spend a few more hundred dollars for such an upgrade, but I don't think it would be wise to buy a unit with many more than 4 input channels. I'm really open to any suggestions as far as recommendations are concerned. This is kind of a first pass questioning of this problem. I'll probably end up refining my questions as I have more discussions. Thanks for reading this post, and thanks in advance for those that respond. -TNKS -- Note: To reply to me personally, you'll have to remove the "NOSPAM." domain extension from the address I've supplied.