The Stage Plus padded protective bag is a made-to-fit cover for the Plus Audio MPS18BA active subwoofer, supplied by AV Distribution under its Stage Plus accessories brand. It slips over the cabinet to protect it from scratches, scuffs, dust and knocks while it is loaded, transported and stored, which is important for rental companies, DJs, bands and churches that move their sound system regularly. Keeping the sub covered also protects its display, connection panel and polyurea finish between gigs. The MPS18BA it is made for is a large 18-inch powered subwoofer: Plus Audio lists it at 605 x 695 x 660 mm (H x W x D) and 55 kg, with 1,000 W RMS Class D amplification, 135 dB maximum SPL and a 40 to 120 Hz response, so the bag is correspondingly large. Because it is cut for this specific cabinet, a snug fit on other subwoofers cannot be assumed. The bag material, padding thickness and handle or zip layout are not published, so check with us if you need those details. The subwoofer itself is not included.