Hi, i have this amplifier (Alfa Linear AL320.4) in my car, the previous owner installed it, but the subwoofer isnt working. The amp has power going through it, so its still fine. Any ideas on what subwoofers supports the amp? Not sure how to select a subwoofer for the amp since there is watts and ohms matters.. It would be nice if you include what to check for when buying sub for this amp. Thanks.
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