BRAND NEWJL AUDIO 10TW3-D810-inch 400 Wattsnbsp; RMS Dual 8-Ohm Voice Coil Shallow-Mount SubwooferTW3s are optimized for small enclosures and offer our tab-ear mounting design to maximize cone area within their mounting footprints. We know you��re going to love working with these amazing Subwoofers.Key Features:Very shallow mounting depth (3.25 / 3.50 Inches)No pole vent: permits mounting close to the rear wall of enclosure.Very small sealed enclosure volume requirementsVery long linear excursion capability (0.60 In / 15.2 mm, one-way)DMA-optimized motor designs��concentric tube�� architecturePatented ��floating cone attach method�� technologyCast alloy frameInjection-molded, mica-filled polypropylene coneRubber surroundAluminum-alloy dust cap and rear cap with JL Audio logoPrecision-built in USA at JL Audio��s Miramar, Florida factory with global componentsSpecifications:Continuous Power Handling (RMS): 400 WRecommended Amplifier Power (RMS): 200 – 400 WNominal Impedance (Znom): Dual 8 ��Nominal Diameter: 10 in / 250 mmOverall Diameter: A1: 11.2 in / 284 mm | 10.5 in / 267 mmMounting Hole Diameter: 9.625 in / 244 mmBolt Hole Circle Diameter: 10.5 in / 267 mmMotor Outer Diameter: 5.1 in / 130 mmMounting Depth: 3.25 in / 83 mmDriver Displacement: 0.019 cu ft / 0.54 LNet Weight: 10.1 lb / 4.6 kgParameters:Free Air Resonance (Fs): 39.262 HzElectrical ��Q�� (Qes): 0.825Mechanical ��Q�� (Qms): 9.84Total Speaker ��Q�� (Qts): 0.761Equivalent Compliance (Vas): 0.510 cu ft / 14.44 LOne-Way Linear Excursion (Xmax)*: 0.6 in / 15.2 mmReference Efficiency (no): 0.23%Efficiency (1 W / 1 m)**: 82.27 dB SPLEffective Piston Area (Sd): 56.532 sq in / 0.0365 sq mDC Resistance (Re)***: 15.008 �� 10-Inch Shallow-Mount Car Subwoofer Continuous Power Handling (RMS): 400 W Nominal Impedance (Znom): Dual 8 ��