GATELY AUDIO Alpha series 15" subwoofer.   Cutout Diameter **"Mounting Depth **" 3" 4 layer voice coil8.5" Y35 250oz Ferrite MotorGATELY shield embossed carbon fiber dustcap2000 watt RMS   Weight: 50 lbs.  SPECIFICATIONS   Watts 2000 RMS MIN INTERNAL VOL 3.0 cubic feet MAX INTERNAL VOL 4.0 cubic feet MIN Port Area 27 sq inches MAX Port Area 33 sq inches Alpha 15" D3 parallelf(s) = 34.42 HzQ(ts) = 0.675V(as) = 51.46 liters (1.817 cubic feet)SPL = 86.33 dB SPL 1W/1mNominal Diam. = 0 mm (15 in.) Model: Alpha 2 15 inch Dual 3 OhmR(e) = 1.631 OhmsQ(es) = 0.7549Piston Diam. = 323.9 mm (12.75 in.)SPL = 93.24 dB SPL 2.83 VrmsC(ms) = 0.054 mm/N Z(max) = 15.4 OhmsL(e) = 0.577 mH at 10kHzQ(ms) = 6.374BL = 13.6n(0) = 0.265 %M(ms) = 396 grams Alpha 15" D3 Seriesf(s) = 33.98 HzQ(ts) = 1.183V(as) = 52.26 liters (1.845 cubic feet)SPL = 83.36 dB SPL 1W/1mNominal Diam. = 0 mm (15 in.) Model: Alpha 2 15 inch Dual 3 OhmR(e) = 3.165 OhmsQ(es) = 1.464Piston Diam. = 323.9 mm (12.75 in.)SPL = 87.39 dB SPL 2.83 VrmsC(ms) = 0.055 mm/N Z(max) = 16.51 OhmsL(e) = 0.5993 mH at 10kHzQ(ms) = 6.171BL = 13.59n(0) = 0.1336 %M(ms) = 400 grams