B&C 21DS115-4 Specifications
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Lightweight but powerful FEA-optimized neodymium magnet
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Extremely high BL factor and Xmax for outstanding LF output
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14 mm Xmax, 60 mm peak-to-peak excursion before damage
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4.5" split winding copper voice coil on fiberglass former
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Ventilated voice coil gap reduces power compression
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Aluminum demodulation ring on pole piece reduces distortion
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Double silicone spider
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Nominal diameter: 530 mm (21.0 in)
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Nominal impedance: 4 Ohm
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Minimum impedance: 4.2 Ohm
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Nominal power handling: 1700 W
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Continuous power handling: 3400 W
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Sensitivity (1W/1m): 97.0 dB
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Frequency range: 33 - 1000 Hz
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Voice coil diameter: 116 mm (4.5 in)
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Winding material: Copper
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Former material: Glass Fibre
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Winding depth: 34 mm (1.34 in)
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Magnetic gap depth: 14 mm (0.55 in)
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Flux density: 1.15 T
Design
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Surround shape: Triple Roll
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Cone shape: Radial
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Magnet material: Neodymium Inside Slug
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Spider: Double Silicone
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Pole design: T-Pole
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Woofer cone treatment: TWP Waterproof Both Sides
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Recommended enclosure: 250.0 dm3 (8.83 ft3)
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Recommended tuning: 32 Hz
Parameters
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Fs: 33 Hz
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Re: 3.6 ?
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Qes: 0.37
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Qms: 7.7
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Qts: 0.36
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Vas: 278.0 dm3 (9.7 ft3)
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Sd: 1680.0 cm2 (260.4 in2)
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o: 2.6 %
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Xmax: 14.0 mm
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Xvar: 15.0 mm
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Mms: 335 g
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Bl: 24.8 Txm
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Le: 1.7 mH
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EBP: 89 Hz
Mounting Information
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Overall diameter: 547 mm (21.5 in)
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Bolt circle diameter: 527 mm (20.7 in)
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Baffle cutout diameter: 508.0 mm (20.0 in)
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Depth: 250 mm (9.9 in)
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Flange and gasket thickness: 14 mm (0.53 in)
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Air volume occupied by driver: 15.0 dm3 (0.53 ft3)
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Net weight: 14.0 kg (30.8 lb)
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Shipping units: 1
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Shipping weight: 16.4 kg (36.1 lb)
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Shipping box: 590x590x300 mm (23.1x23.1x11.8 in)
