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Is that a capacitor and two amps ? That rockford stuff sure looks good. How about vibration from the trunk or bumper?

It's a Power 850 and a Power 1000bd connected with a link. It's more power than I actually need, but I had them from my previous car. The link has a voltage meter and some dancing lights.

I put the punch bass knob inside the cigarette lighter, you just twist the cigarette lighter to adjust it.