JBL MRX525 15-Inch Premium 350-Watt Two-Way Portable Loudspeaker Dual JBL special 15 inch Differential Drive woofers gives high power with low weight JBL Premium 1.5 inch Annular Polymer Diaphragm HF Driver Tough "Duraflex" coated paint enclosure finish and Heavy Duty 16 gauge Perforated Grille 70 degree x 70 Degree Nominal HF Horn for smooth all-round room coverage Quasi 3 way crossover design for extra bass from the two 15" woofers