Triangle Thetis 280 Active Subwoofer 150 W White – Tieftöner (Active Subwoofer, 150 W, 35 – 120 Hz, 400 W, 21 cm, 21 cm (8.25)) : Amazon.de: Electronics & Photo
MONACOR Shop - SPH-200TC
FOCAL Utopia Be 21WX 21cm Subwoofer | Sub Woofer Speakers | Croooober
Accuton P220 Passive Radiator 21 cm 1 piece
1200W Car Subwoofer Strong Car Speaker 10 Inch Subwoofer Built in Amplifier - China 10 Inch Car Subwoofer, 12 Volt Speaker Subwoofers | Made-in-China.com
Eminence NSW6021-6 Tour Grade 21 inch neodymium subwoofer speaker - Eminence NSW6021-6 21 inch subwoofer speaker. The Eminence NSW6021-6 21" subwoofer speakers. The NSW6021-6 handles 2,500 watts RMS.
Woofer 8" Ricambio per Casse Acustiche 21 Cm. 8 Ohm 150W e/o Auto HI-FI