I also get an annoying sound when starting, but a buzzing sound originating possibly from behind the sunroof switch. It happens very rarely, but enough to cause a concern. When it buzzes, the starter doesn't engage, but if attempted again, it'll start perfectly.
One thing I notice, and this may or may not be related to this problem, but I noticed in the first ignition key position, the amp does not turn on. I think it should be on at this position, right? (Possibly bad wiring if so?)
I have an 03 accord ex with a 300 watt amp. with sub. Any help out there? Is this just simply bad wiring? Bad relay? Voltage difference? Thanks.