Dual 21″ Direct-Radiation Touring & Infra-Extension Subwoofer Enclosure design Bass Reflex Transducers 2 x 21" Continuous RMS Power [6dB Crest Factor, 2h] 3,000 W Nominal Impedance 4 Ohm Peak SPL [Full Space/Half Space 136/142 dB @ 1 m (2 ms, 12 KW) Frequency Response [-3 dB] 29-100 Hz Dimensions [WxHxD]...