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  1. Need help with Alpine Pdx f4 and alpine spR 65 speakers

    Technical & Advanced Car Audio Discussion
    Pdx f 4 amp powering type r components up front and coax in the back. I also have the alpine 149bt head unit. I have no subs, so would I leave the amp crossover on full range? Or set up a high/low range with proper frequencies? What's really weird and frustrates me is I swear everytime I drive...