Focal Sub Air (Black) Shallow, wall-mountable wireless subwoofer at Crutchfield
300 ICW8 In-Wall Speaker - Focal | Focal
Focal Sub Air Wireless Subwoofer - The Music Room
Wavecor SW223BD02 21 cm bass aluminium 4 ohm
Oaktron 21” (533 mm) Ventuno 1600 Watt Subwoofer
MOREL CAW 938 - 21cm Woofer - Bass Driver
LAV SAN215.30 - 8: Subwoofer, 2000 W, neodymium, 21 inch (53 cm), aluminium at reichelt elektronik
Accuton P220 Passive Radiator 21 cm 1 piece
Amazon.com: B&C 18NW100 Studio Subwoofer, Black : Musical Instruments
Dayton Audio RSS210HO-4 REFERENCE Series, 8.3 inches (21 cm), High Performance HO Subwoofer, 4 Ω : Amazon.sg: Electronics
Carrozzeria TS-WH1000A 21 × Eight Cm Dual-sided, Double-sided Drive HVT Unit Subwoofer Built-in Amplifier | Built in AMP Sub Woofer Speakers | Croooober
Amazon.com: B&C 8CXN51 Studio Subwoofer : Musical Instruments