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I drive a 2010 Malibu LTZ. My sub is a 12" Kenwood, already in a bandpass box and i already have an amp. I want to keep the stock head unit. How much would it cost to have an audio shop install it in my car?

I have two 10" subs in a bandpass box where the cones are diagonally facing each other behind plexiglass. I want to know if running stereo can damage them due to both subs playing different things. If not I am able to run them both on the same signal via a y-splitter but I am [...]