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C315D4V3 C3 Series Version 3 15" Subwoofer - Concrete Audio
Concrete Audio
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Building a 12" Subwoofer with Concrete Base - by SoundBlab - YouTube
C312D4V3 C3 Series version 3 12" Subwoofer - Concrete Audio
C112D4 C1 Series 12" Subwoofer - Concrete Audio
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C115D4V2 C1 Series Version 2 15" Subwoofer - Concrete Audio
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