Two MTX "Thunder 6000" 10-inch subwoofers for sale. Nice asymmetrical linear drive system (ALDS) spreads stress evenly across the suspension for high output with low distortion. Used, but in good working order. Asking $300 for the matching pair. Below is info from the manufacture ... Smart looks and smarter sound ~ that's the story of the MTX Thunder6000 series T6104A 10-inch subwoofer. A mica-filled poly cone is butressed with eight stiffening ribs, so it keeps its shape even when you pour on the power! The cones are coated with spun aluminum for a "bulletproof" appearance. The NBR (Nitrile Butadiene Rubber) surround and gasket are fabricated as a single piece to prevent air leaks around the woofer. Spider Plateau Venting draws cool air into the speaker for better performance. An oversized magnet structure and an 2-inch four-layer voice coil will electrify your ears with outstanding output. * Model: T6104A * Impededance: 4 Ohm's * Frequency Response 31Hz ~ 150Hz * Peak Music Power: 500 watts * Power Handling (RMS/Total): 250/500 watts * Sensitivity 85.2 dB * Voice Coil: 2-inch (5.1cm) * Magnet Weight: 37 oz (1059g) * Mounting Depth: 5.062-inch (12.85cm) * Sealed box volume: 0.5 - 1.0 cu. ft. * Ported box volume: 1.0 - 2.0 cu. ft.