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Concept" Subwoofer | DIYMobileAudio.com Car Stereo Forum
Concept HZ-10DP at Onlinecarstereo.com
Just picked up these bad boys for really really cheap, but have no idea what they are so I can't find an RMS rating, they are older probably around 2000-2010 : r/CarAV
Concept Dp-12 Pair of 12" 450w Single Voice Coil Subwoofers for sale online | eBay
Concept CE413293591 Subwoofer Enclosure for sale online | eBay
Mercari: Your Marketplace | Mercari | Subwoofer, Mercari, Home appliances
SOLD: FS: DALI Concept Sub 12" 160w Sealed Subwoofer (Black Ash) | Stereo, Home Cinema, Headphones Components