This is a great repplacement woofer for all high power bass applications including portable subwoofer systems.

Specifications: * Power handling: 800 watts RMS * Voice coil diameter: 4" * Le: 1.67 mH * Impedance: 8 ohms * Re: 5.1 ohms * Frequency range: 25-2,000 Hz * Magnet weight: 109 oz. * Fs: 28 Hz * Vas: 12.49 cu. ft. * Qms: 5.53 * Qes: .25 * Qts: .24 * Xmax: 5.5 mm * Dimensions: Overall Diameter: 18", Cutout Diameter: 16.56", Mounting Depth: 8.15".

800 Watt Power Handling
Kapton coil former for increased rigidity and thermal protection
Polyamide-imide coated two-layer, 27ga., copper voice coil for improved power-handling and durability
Ferrite magnet
Vented core for increased power-handling
Die cast aluminum basket for rigidity
Paper cone
Cloth cone edge
Solid composition paper dust cap