21-in Woofer w/4 Ohms Impedance & 3400 Watts Continuous Power Handling Capacity & Neodymium Magnet

This next evolution subwoofer uses a new, longer, four layer aluminum voice coil. The result is more energy in the gap, less heat, higher sensitivity, higher power handling, lower distortion and better overall performance. 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 17 mm 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-in voice coil. Double silicone spider with optimized compliance Ventilated voice coil gap for reduced power compressionAluminium demodulating ring for very low distortion. Magnet material: Neodymium Inside Slug. Nominal Diameter: 530 mm 21.0 in. Nominal Impedance: 4 Ohms. Minimum Impedance: 3.1 Ohms. Nominal Power Handling: 1700 W. Continuous power handling: 3400 W. Sensitivity 1W/1m: 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 TDesign. Surround Shape: Triple Roll. Cone Shape: Radial. Magnet Material: Neodymium Inside Slug. Spider: Double Silicone. Pole Design: T-Pole. Woofer Cone Treatment: TWP Waterproof Both Sides. Recommended Enclosure: 130.0 dm3 4.59 ft3. Recommended Tuning: 40 Hz Resonance Frequency: 30 Hz. 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 Recone kit: RCK21DS1154