This is a weird one!!! I picked up some RT2000P's for my brother. I had them in my system for two days and they were perfect. I installed them at my brother home today and with all sources off you can hear what sounds like a radio signal from the subs only!!! The only way to get it to go away is to unplug the amps! Then as soon as you plug them up and use the subs the symptom is back... They did not have this problem at my home, so I theorize that some how his wiring is becoming an antenna! Anyone experienced this before????