DISCOUNT LINK WWW.AMAZON.COM Car Electronics Re Audio 18 BRAND NEW RE AUDIO MX18D2 18" 1500 WATT RMS RATED (3000w PEAK) DUAL VOICE COIL 2 OHM COMPETITION CAR SUBWOOFER WITH 4" 4 LAYER ALUMINUM VOICE COILS AND NEO MAGNETS!**FREE SHIPPING**Features:18" Competition subwooferDual 2 ohm voice coils (This gives you the best wiring options!!)3000 watts peak1,500 watts RMS ratedTested and legitimate real world RMS power ratingsOne-Way, Linear Excursion -Xmax: 54 mm (this is one of the highest excursion subs in our store)Dual Composite 2-piece Cone Rubber Surround Integrated Gasket Cast Aluminum Basket Tork-Tite Terminal 4" 4-layer Aluminum Voice Coil FEA Optimized Motor Structure Powerful Neo Magnet Dual Progressive Spiders Integrated Tinsel Lead Mounting Depth - 12.25"Mounting Hole Diameter - 17.375"Overall Diameter - 19"Bolt Hole Circle - 18.25"Motor Width - 8.5"Motor Depth - 2.5"Basket Depth - 9.75"Displacement - 0.14 cu. ft.Electrical Q Value -Qes: 0.476Mechanical Q Value -Qms: 3.214Total Speaker Q Value -Qts: 0.415Free Air Resonance -Fs: 16.742 HzEquivalent Compliance -Vas: 384 litersOne-Way, Linear Excursion -Xmax: 22 mmEfficiency -SPL 1W/1m: 87.65 dB SPLEffective Piston Area -Sd: 1210 cm^2DC Resistance -Re: 1.4 ohmNominal Impedance -Znom: Dual 1/2 ohmThermal Power Handling -Pe: 1500 WForce Factor -Bl: 14.56Sealed Compact: 1.5 cubic feet Sealed Optimal: 3.0cf - 4.0 Ported Compact: 5.0 cubic feet tuned @ 35Hz Ported Optimal: 7.0 cubic feet tuned @ 33Hz