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I kill the bass by using my subwoofer gain on my head unit.
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Disco.
When you turn it back on (by increasing the gain on your head unit) you are changing the output of all channels. (yes confusing but hear me out) Could be that your overloading the preamp outputs on the head unit when the gains are up. Any way to reduce the output of the head unit (such as limit the volume and compensate by slightly increasing the gain of the amps?)
Recall that each output is likely on a common voltage rail, so that when you crank the sub up, the preamp output on all channels suffers.
I know on my head unit, I have a max volume setting of "30", but everything above 27 gets distorted and clips. When I use the in-built EQ and set anything above "+3", then I must limit the output to under 25 or the same thing happens.
Perhaps set the EQ or any gains to Flat (or 0) and see if it happens there. I'm starting to suspect the head unit is part of the issue here.
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thus if you do not have a cap, and you getting dimming headlights and gauge lights you would have to purchase one to keep that from happening.
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nah, PT cruisers are noted for poor grounding. I fixed my own headlight dimming with a 4AWG to the chassis from battery neg.
Caps are a bandaid and likely cause further issues.