Alpine SBR-S8-4 Slim Box Car Ported Enclosure with one 8 inch Type-R Under seat subwoofer 1000 watts Power Alpine Ported enclosure with one 8" Type-R woofer RMS: 150-350 watts (1,000 watts peak power) 4-ohm total impedance frequency response: 30-200 Hz W: 19-1/4" x H: 11-3/8" x D: 6-5/8"