Intermittent noise from 2 year old system

[wcarwile]

I installed my car audio 2 years ago with no issues. Now two years later, something strange is happening. When I turn on my car and music I have no problems for about the first 30-60 minutes. Then at the end of a song when everything gets quiet, I'll notice a static/shrill sound that gently crescendos for a few seconds before becoming a constant volume. Once the next song starts, the noise is constant until the subwoofer kicks in, then the sound literally alternates with the sub kick until the song becomes loud enough. This will continue until I turn the car off for at least 15-30 minutes.

The volume on my head unit does not effect the volume of the noise. Turning on my brights will temporarily stop it. But it will start again once I turn them off.

I would describe it as an unwanted noise that is generated only when enough power is not being drawn by my speaker system.

Does anyone know what would cause this? Like I said I've had no issues for over two years until this started happening.

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[BOOMINGRANDPA 5,000+ posts]

have no idea but if u have amp check ground and all speaker wires make sure they aren't touching metal., I had speaker wire grounded under seatbelt mount plate cause my dome lite to stay on.. could even be wire behind hu.. or even remote turn on wire could be touching something in fuse box or where ever it's connected at..

 

[audiobaun 5,000+ posts]

Refresh the end of your ground wire and its grounding location.Corrosion may be a factor

 

[wcarwile]

I switched out the amplifiers and haven't had the issue since, maybe it was just starting to fail. I don't really know though.