I have a Flightcom 403 installed and everything seems to work fine except when using the intercom. Whenever I talk to the passenger (or vice versa) we can hear each other OK, but there is also a lot of background noise that comes in also. Is this a function of the intercom or the old non-ANR headsets I use? It seems to me that when I've flown in other RVs with ANR headsets there is little to no background noise when talking, but I hate to spend the money on new headsets only to find that wasn't the problem after all.