SOUNDSTORM STS12D STEALTH DUAL VOICE COIL SUBWOOFERS [12", 1200 WATTS]  Description POLY COATED PAPER CONE SANTOPRENE SURROUND DUAL HIGH-TEMPERATURE KAPTON VOICE COILS IMP: DUAL 4_ 12" 1200W MAX FREQ RESP: 28 HZ2 KHZ EFFICIENCY: 1W/1M @ 95 DB MAGNET STRUCTURE: 120 OZ MOUNTING DEPTH: 6.25" Features Mounting depth: 6-1/4" Magnet structure: 120 Oz. Voice coil diameter/type: 2" kapton