So I'm finally gigging again and looking to go wireless with my in-ears. I'm hoping the more experienced folks will have some insight into the additional noise (if any) that gets introduced with wireless in-ears. Currently, I run my in-ears from a Rolls PM351. It's dead quiet (unless I really crank the levels beyond what I would ever use comfortably) and the fidelity of the bass sound is perfect. I can hear every little nuance and blemish. I just picked up an Audio Technica M2 wireless system. I haven't had a chance to use it anywhere outside of the house yet. I run a Y cable (stereo to 2 x mono) from the Rolls headphone out to the L & R in on the AT M2. Even with nothing hooked up, there is a low hiss audible when using the M2 wireless pack. With the Rolls and bass hooked up, when playing notes on the bass the hiss comes up slightly more - almost like a noise gate was involved. Finally, I can tell that the M2 is altering the bass sound somewhat, such as hard attacks getting a little clip/pop artifact (almost like the M2 had a compressor on it) even though the M2 input isn't getting anywhere close to clipping. Same attack and level wired to the Rolls, and I can hear the full attack sound without any artifacts. So my question is: does this sound normal for the M2? Or for similar wireless units like the Shure PSM200 or others? Or is this M2 defective maybe? I really like the sound I get wired from the Rolls, but I really want to go wireless on the stage. Any help or ideas would be greatly appreciated.