Re: Subwoofers causing door and dash speaker distortion(?)
No point in a cap, like pissing in the wind. Ground the system better. period. 4 AWG from a very good (read NEW, as in drill the hole, tap it, put it in yourself) ground point to the negative terminal of the battery. Connect the alternator and engine block to the same point. Run your ground cable for your amplifiers from that same point.
Also you should have at least 4AWG from the positive terminal of your battery, through a big ole fuse (like 50-100A) within a few inches of the battery. Make sure you grommet any hole the 4AWG runs through, esp through the firewall. Use a good quality distro block at the amps, each line should be fused in addition to any fuses the amps/crossover/processor uses.
Quite likely when you turn on the subs you are using a bit more power, and the PT is known for terribly ground loops/lost voltage/drops from any run into the back hatch area. You pull a couple hundred watts and its voltage drop city. It's quite good advice to search "hypergrounding" on this forum.
What are you using for a crossover? Perhaps you are loading the processor/crossover and thats causing a mismatch elsewhere in the system?
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