October 26, 201014 yr Straight from their site:BL18DUAL 1 | DUAL 2Fs: 33.2 Hz | 33.2 HzRe: 0.7 Ohms/coil | 1.4 Ohms/coilQms: 5.82 | 5.82Qes: .32 | .32Qts: .30 | .30Mms: 302g | 302gCms: 0.88mm/N | 0.88mm/NSd: 1210cm^2 | 1210cm^2Vas: 181.0 l | 181.0 lSpl: 94.1dB 1W/1m | 94.1dB 1W/1mBl: 16.6 N/A | 22.7 N/AXmax: 18mm | 18mmRms: 1000W * | 1000W *Sealed box: N/A cuft | N/A cuftPorted box: 5-8cuft | 5-8cuftSub OD: 18.500” | 18.500”Cut ID: 16.750” | 16.750”Mounting depth: 9.750” * | 9.750” *Displacement: 0.26cuft * | 0.26cuft *