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2020 Onyx
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If you have to ask my impulse is to tell you to have it professionally installed, but a few others have installed active subwoofers either under their driver's seat, the front passenger seat, or the spare tire compartment. There's no pre-existing wiring so you'll have to take apart the dash somewhat to get at the wiring to get the signal. If you're not comfortable doing that then have a pro do it.

Some of the subwoofer installs are found in this thread: Onyx and other non-Harman Kardon audio upgrades - first...
 
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