Black Diamond DIA-15D4 15" Car Subwoofer Dual 4+4 Ohm High-Performance - SOLD AS SINGLE. Black Diamond’s DIA-15D4 is engineered to make your audio system shine. The robust steel basket and 59 oz ferrite magnet form a rock-solid base, while the subwoofer’s diamond-black finish adds a touch of premium aesthetics to any car audio build.
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