BMW M4 Custom Subwoofer

At CSD Audio, it’s all about clean & stealth. We all want our cars to sound better but don’t want to lose storage space. In this M4, I stashed two Focal Access 10 inch subwoofers in a storage area under the floor. Weight was a major concern for this BMW owner so this box was fabricated mostly from fiberglass and weighs only about 8 lbs. Hidden, lightweight, and sounds amazing!

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