B And C 21DS115 B&c Speakers 4.5"coil,21"woofer

This item is brand-new, factory sealed.

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: 8 Ohms.
* Minimum Impedance: 6.5 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