Focal 30A4

12 Subwoofer for Sealed Enclosures The 12 Access 30 A4 subwoofer develops a rated power of 250 W RMS. The essential complement to your car audio installation, it gives your kit heightened dynamics and you benefit from powerful Focal sound. Ideal for use in sealed and bass reflex enclosures, it achieves extreme performance levels and powerful, deep bass.