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Alpine SWT-10S4 10" Subwoofer 4OHMSRight size, right sound Here's a big bass breakthrough for truck lovers. Alpine engineered their SWT-10S4 10" subwoofer to go behind your seat, and sound especially good in the limited space of a truck cab. This deep-sounding, high-performance sub works well in shallow enclosures that'll fit behind or under the se..