Welcome, fairly new owner here too (1 year). I added the Kenwood 8" amplified sub under drivers seat. There's a how-to around here, that had most of it right except they used rear speaker to drive the sub amp. Found another write up somewhere else that (and even the Kenwood's manual) that said use FRONTS if you have a digital processor (we do). Noticeable change in bass input! Nice, cheap, easy addition.
I did it after a tuner though. What a difference that made!
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