21″ Direct Radiation Multipurpose & Infra-Extension Subwoofer Enclosure design Bass Reflex Transducers 21″ Continuous RMS Power [6dB Crest Factor, 2h] 1,000 W Nominal Impedance 8 Ohm Peak SPL [Full Space/Half Space 131/137 dB @ 1 m (2 ms, 4,000 W) Frequency Response [-3 dB] 29-100 Hz Dimensions [WxHxD] 6...