B&C 21DS115-4 21" Professional Neodymium Subwoofer 4 Ohm
- 99 dB efficiency to ensure high output even with modest amplification
- Double silicone spider keeps excursion linear even beyond rated Xmax
- Neodymium magnet allows a very high force factor without excess weight
- 4.5" four layer CCA voice coil allows high power handling and Bl
- Aluminum shorting ring help control the voice coil for lower distortion
