Audison Voce II AVBX 12 D4 II Subwoofer Enclosure 12" Passive Sub Box 550w RMSAVBX 12 D4 II Subwoofer Box 300 mm Grille included The AVBX 12 D4 II is the compact subwoofer enclosure of the VOCE II line, designed to bring high end low frequency performance into tight installation spaceswithout compromise. Its ultra shallow sealed architecture is engineered to deliver tight, accurate and dynamic bass while preserving valuable in vehicle space. Built from high density 15 mm MDF with internal bracing, the enclosure ensures maximum