Citronic CXB12 Subwoofer Driver 2 x 200W 902.577UK @ TradeWorks
STLF-18500A | 18" Cast Aluminum Frame High-Power Raw Woofer Speaker, 1 – Sound Town
PRO Audio Subwoofer Speaker Driver 8 Inch 6ohm 80W Professional Subwoofer Driver Speaker - China Subwoofer Driver and PA Speaker price | Made-in-China.com