I bought a NavTV (allgig and av harness) unit directly from navtv. I had this, along with a new system (amp, lc7i, and speakers) installed professionally this weekend. After several hours of trying, the installers couldn't get the the system to work properly. They said with the NavTv installed, one of the audio channels on the system was barely audible. They thought it may have been the LC7i or the Amp, but after replacing those and the problem remained, they realized it was the NavTV. They disconnected that and the sound worked as intended. So my question, anyone have a similar issue? Any idea what could cause this or fix it? I'd like to get the NavTv installed so I can use the backup camera and other features. I'll be calling NavTv shortly too and will post if they offer a soluion. Any help is appreciated!