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I purchased the following from Crutchfield: Alpine CDE-9873 HU Dash Speakers - Polk DB351 w/ PAC BB-300A2 Bass Blockers Front Door Speakers - Blaupunkt GTc652 6-1/2" Component System w/ PAC BB-600A2 Bass Blockers Rear Seat Side Panel Speakers - Polk Audio DB690 I'm adding this sub to the system and now...
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I want to replace the factory Stereo with an Alpine CDE 9873 but what should I do about the factory subwoofer and speakers?