B&C 21DS115 21-Inch Speaker Driver - 1700W RMS, 4 Ohm

The B&C 21DS115 21-Inch Speaker Driver 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. 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 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-inch voice coil alternatives.

Recone Kit: JP103982 (B&C RCK21DS1154)

B&C 21DS115 21-Inch Speaker Driver Features

- 3400 W continuous program power capacity
- 116 mm (4.5 inch) 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

B&C 21DS115 21-Inch Speaker Driver Specifications

- Nominal Basket Diameter: 530 mm (21.0 inches)
- Nominal Impedance: 4 Ω
- Minimum Impedance: 3.1 Ω
- Nominal Power Handling: 1700 W
- Continuous Power Handling: 3400 W
- Frequency Response: 30 - 1000 Hz
- Sensitivity: 99.0 dB
- Voice Coil Diameter: 116 mm (4.5 inches)
- Winding Material: Aluminium
- Former Material: Glass Fibre
- Winding Depth: 36 mm (1.42 inches)
- Magnetic Gap Depth: 14.0 mm (0.55 inches)
- Flux Density: 0.8 T
- Connection: Spade Terminals

Design:
- Surround shape: Triple Roll
- Cone shape: Radial
- Magnet material: Neodymium Inside Slug
- Spider: Double Silicone
- Pole design: T-Pole
- Waterproofing Treatment: TWP Waterproof Both Sides
- Recommended enclosure: 130.0 dm³
- Recommended tuning: 40 Hz

Parameters:
- Fs: 30 Hz
- Re: 2.2 Ω
- Qes: 0.2
- Qms: 11.0
- Qts: 0.21
- Vas: 274.0 dm³
- Sd: 1680 cm²
- η₀: 3.4 %
- Xmax: ± 15.0 mm
- Xvar: ± 17.0 mm
- Mms: 412.0 g
- Bl: 28.8 Txm
- Le: 2.4 mH
- EBP: 150 Hz

Physical:
- Overall diameter: 547 mm (21.5 inches)
- Bolt circle diameter: 527 mm (20.7 inches)
- Baffle cutout diameter: 508 mm (20.0 inches)
- Depth: 255 mm (10.04 inches)
- Flange and gasket thickness: 13 mm (0.51 inches)
- Air volume occupied by driver: 15.0 dm³
- Net weight: 14.7 kg