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Subwoofer enclosure, made of 1/2″ clear and black acrylic, held together with acrylic weld and a bit of silicone. Custom made for my Polk 8″ dual voice coil, getting a very minimal but consistent 2x 80 watt bridged loads from a 4x 35w alpine power amp. Enclosure volume at the Crutchfield recommended .35 cu ft (roughly 10″ sq).

Efficiency in motion.