21″ 4000 Watts High Output Woofer – PROFILE21 – Blastking
BUILD THIS! Dual 21-inch subwoofer - Celestion
RCF LF21X451, Woofer 21", 2000 watts RMS / 8 ohms | MUSIC STORE professional
RCF SUB-8005AS Single 21″Active High Power Subwoofer – Sonic Circus
F121 Single Horn 21 pouces Charaded Pro Audio Subwoofer Passive Subwoofer - Achetez un subwoofer de 21 pouces, F121 Subwoofer, Pro Audio Subwoofer Produit sur SANWAY Professional Audio Equipment Co., Ltd.