Features a single 15" woofer with a nearly indestructible high-temperature voice coil. a high-output, 1-3/4" titanium dome compression driver with optimized symmetric phase plug handles the high frequencies. The driver/crossover combination allows the S215 to handle up to 1400W of peak power, deliver a peak SPL of 130dB, with a frequency response of 55Hz to 20kHz.