Dayton Audio DCS380-4 15" Classic Subwoofer 4 Ohm The Dayton Audio Classic 15" Subwoofer is an excellent general-purpose subwoofer that works well as a replacement in powered subwoofer systems, or for new system design and construction. For the utmost versatility, the parameters are suitable for sealed or vented enclosures. The heavy-duty cone, wide-roll rubber surround, and long linear excursion ensure excellent low-bass performance.