DDRL-PSW10-D4: Speaker size: (in) 10 Watts RMS: 400 Watts peak: 800 Impedance: D4 VCD: (in) 2.5 Piston diameter: (in) 8 FS: (Hz) 38 Qms: 5.114 Qes: 0.693 Qts: 0.61 Vas: (liters) 17.73 dBSPL: 85 Xmech: (mm) 27 Xmax: (mm) 13 Frame OD: (in) 10 Frame OD w/Gasket: (in) 10.15 DDUE-10.3a: Ported enclosure for 3×10″ subwoofer Net volume: 80 liters. Tuning frequency: 35 Hz Diameter of speaker hole: 227mm Measurements cm: ( W x H x D ): 875 x 340 x 500