Noise from subs

[UrbanSounds 10+ year member]

Sups guys,

Im getting a thumping noise from my subs everytime I change the track or station. Also when I hit the turn signal I get noise as well, its not loud but enough to notice it.

So I threw on a noise filter and it took care of the problem, but than the noise filter went out and the subs stop working, so I disconnected the filter and the subs started working again but the noise is back.

Is it a bad ground, bad rcas,...?

The amp is a Crunch, subs are PG, and mids and highs are PG.The HU is a pioneer DEH-4000. Now Ive heard that pioneer have ground issues, should I ground the rcas on the back of the HU.

Thanks

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[funkyab 10+ year member]

ground loop or current in your rca outputs of head unit.