JBL  JRX115 15-Inch Classic 250W Continuous Two-Way Portable Loudspeaker Two JBL 15 in LF Drivers with a 64 mm (2.5 in) Edge Wound Ribbon Voice Coisl - for greater efficiency and Power handling Ferro-fluid Cooled Compression Driver with Titanium diaphragm improves HF performance Tough acoustically Superior enclosure constructed using 19mm MDF for improved LF performance JBL advanced Crossover Network for sound shaping and SonicGuard protects the HF driver from excesses Dual-angle Pole-Mount Socket Allows the Speaker to Tilt 10for More Uniform Audience Coverage.