This has been going on for a while, but I guess it's time I figure it out. When I get into my truck and turn it on, I hear the amp click on and there's this very very high pitch beep that comes out of the amp. That's right, the amp. It's a HiFonics bx1000d, and it still performs perfectly and has for months.It's a continuous beep, but sometimes it doesn't happen. I used to disconnect and reconnect the wires which sometimes, but rarely help, but now I just drone it out with bass. Anyone have any ideas what it could be/how to fix it? Thanks in advance.