Its a 12" S4 or S2 haven't tested it yet. It says polk around the rubber surround but I can't figure out which one it is. I tried looking up the number on the magnet but nothing turns up.
POLK AUDIO SUBWOOFER 12" EX SERIES EX12 Search for manual at polkaudio.com EX12 http://www.polkaudio.com/downloads/manuals/car/EXIISubManual.pdf EX SERIES II SUBWOOFER SPECIFICATIONS I Think it's this one