Amazon.com: Dayton Audio HTS545HE-4 21" Kraken High Excursion Subwoofer with 5" Voice Coil 4 Ohm : Electronics
Amazon.com: 21 Inch Subwoofer
Amazon.com: Sound Town 21" Raw Woofer, 600 Watts Pro Audio PA DJ Replacement Subwoofer (Low Frequency Driver) : Musical Instruments
Amazon.com: DS18 PRO-BX21N.2 Car Subwoofer Audio Speaker - 21" In Neodymium Magnet, 6" Voice Coil, 2 Ohm Impedance, 3000W Rms Power, 6000W Max Power - Reinforced Paper Cone for Outstanding Performance : Electronics
Amazon.com: Sound Town 21" Raw Woofer, 600 Watts Pro Audio PA DJ Replacement Subwoofer (Low Frequency Driver) : Musical Instruments
Amazon.com: DS18 PRO-BX21N.1 Car Subwoofer Audio Speaker - 21" in Neodymium Magnet, 6" Voice Coil, 1 Ohm Impedance, 3000W Rms Power, 6000W Max Power - Reinforced Paper Cone for Outstanding Performance : Electronics
Amazon.com: Sound Town Woofer de marco de aluminio fundido de 21 pulgadas y 1000 W (controlador de baja frecuencia), woofer de repuesto para gabinetes de subwoofer PA/DJ (STLF-21500A) : Instrumentos Musicales