Extremely noisy output from Xmod wirel

Let me start by saying that I think the Xmod wireless is a great product. I have bought other products which claim to wirelessly transmit audio over short ranges, and all of them have a lot of interference. The Xmod wireless is not like that at all, the sound comes in crystal clear on the other end. I also love the fact that I can change tracks / volume etc using the remote on either the transmitter or receiver.
One thing that I like to do however is play my music in two locations at once, so if I move from one room to another the music keeps playing.
Currently, I have the transmitter hooked up to my computer via USB, and then I have the line out on the transmitter running to the line in on my computer. This allows me to listen to audio on on my computer speakers and also at the wireless receiver location.
The problem is that the line out from the Xmod wireless transmitter is extremely noisy, so if there's a quiet part on the song or in between songs, I hear tons of what'd I'd call electrical background noise.
I've tried eliminate things by plugging the line out of the transmitter directly into my speakers which did not help, I also tried skipping USB and plugging the transmitter into an electrical outlet and using the line out from my sound card, and that didn't help either.
Does anyone have any ideas of how to eliminate the background noise? If anyone else has the Xmod wireless, can they please tell me if this is a problem they also have? Curious if it may just be a problem with my specific unit.
The strange thing is that the wireless receiver does not suffer from this problem, only the line out from the Xmod wireless transmitter.
Thanks for any help anyone can provide!

- Nope, I contacted support who could only provide me with canned emails about trying to unplug the unit and plug it back in or other tier type suggestions.
They finally authorized a replacement unit, but the replacement unit suffered from the same problem. I can only assume that the problem exists in all units.

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