| Polk Audio AM7516 400 Watt 12 Inch Subwoofer with Power Port Technology Black Whether you’re installing a new set of surround sound speakers adding a second subwoofer for the ultimate home theater experience or just need more heavy-hitting bass from your favorite music the Polk Audio 400-Watt 12-Inch Subwoofer with Power Port... more | | $549.00 FREE shipping go to store |