B&C Speakers R21DS115-8 21-inch Recone Kit for 21DS115-4 Neodymium Subwoofer 1700 Watts Rms 3400 Watts Peak 8-Ohms Motorcycle Car Pro Audio Sound Speaker Waterproof Front Side - RCK21DS1158

This next evolution subwoofer uses a new, longer, four layer aluminum voice coil. The result is more energy in the gap, higher sensitivity, lower distortion and better overall performance. The 21DS115 features a 36 mm long, 4.5 inch diameter (116mm) Copper Clad Aluminum Wire voice coil. With a 1700watt AES power rating, 99 dB sensitivity, and over 16.5mm of Xvar, this high energy subwoofer is a significant step forward from similar models in the B&C range, even approaching the performance of our 6" voice coil alternatives. || GENERAL || Brand : B&C Speakers || Model Number : R21DS115-8 | R21DS115 | RCK21DS1158 || UPC : 8059300648995 | 718852125139 || KEY FEATURES || 3400 W continuous program power capacity || 116 mm (4.5 in) four layer aluminum voice coil || 30 - 1000 Hz response || 99 dB sensitivity || 60 mm peak-to-peak excursion before damage || Neodymium magnet allows a very high force factor and linear excursion || Double silicone spider with optimized compliance || Ventilated voice coil gap for reduced power compression || Aluminium demodulating ring for very low distortion || SPECIFICATIONS || Nominal Diameter 530 mm (21.0 in) || Nominal Impedance 8 Ohm || Minimum Impedance 6.5 Ohm || Nominal Power Handling 1700 W || Continuous Power Handling 3400 W || Sensitivity 99.0 dB || Frequency Range 30 - 1000 Hz || Voice Coil Diameter 116 mm (4.5 in) || Winding Material Aluminium || Former Material Glass Fibre || Winding Depth 36.0 mm (1.42 in) || Magnetic Gap Depth 14.0 mm (0.55 in) || Flux Density 0.8 T || PARAMETERS || Resonance Frequency 30 Hz || Re 5.1 Ohm || Qes 0.24 || Qms 10.0 || Qts 0.23 || Vas 269.0 dm3 (9.5 ft3) || Sd 1680.0 cm2 (260.4 in2) || 3.0 % || Xmax 15.0 mm || Xvar 16.5 mm || Mms 407.0 g || Bl 40.8 Txm || Le 4.6 mH || EBP 125 Hz || MOUNTING AND SHIPPING INFO || Overall Diameter 547 mm (21.54 in) || Bolt Circle Diameter 527 mm (20.7 in) || Baffle Cutout Diameter 508.0 mm (20.0 in) || Depth 255 mm (10.04 in) || Flange and Gasket Thickness 13 mm (0.51 in) || Air Volume Occupied by Driver 15.0 dm3 (0.53 ft3) || Net Weight 14.8 kg (32.63 lb) || Shipping Units 1 || Shipping Weight 17.1 kg (37.7 lb) || Shipping Box 570x570x320 mm (22.44x22.44x12.60 in) ||