GL-21B - HIGH POWER 2000W 21" BASE BIN Description The POPE Professional® GL-21B is a Horn-Loaded and high power, high output sub-woofer designed for touring and permanent sound reinforcement. The bass reflex design features 6" voice coil, long excursion 21" Neodymium transducer mounted in a mechanically and acoustically optimized, rugged weather resistant enclosure. Integrated handles allow for easy setup, loading and transportation. Featuring a massive 21" Neodymium transducer is delivering 136 dB of Maximum SPL, the GL-21B raises the low frequency performance bar to next level. The GL-21B Folded Horn delivers more bass per square inch than other Sub-woofer designs and includes a curved horn mouth bracing for smoother frequency response and extra deep 35mm pole cups for increased stability with full-range speakers.