21" high efficiency Neodymium subwoofer.
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.
Voice Coil Diameter:
1700 W rms, 3400 W program
30 Hz-1.0 kHz
99 db 1w/1m
Baffle Hole Dia:
Flange & Gasket Thickness:
274 L, 9.68 cuft
-Neodymium magnet with vented voice coil
Full Product Specs From Manufacturer's Website