RCF SUB 9007-AS 7200W Active High Power Subwoofer - 2 x 21"The SUB 9007 AS is one of the most powerful 2x21 subwoofers in the field of live sound. Featuring two, high power, hyper vented 21 neodymium woofers with 4. 0 inside outside voice coils, this cabinet deliver a serious amount of low frequencies. Powered by a 7200 W digital amplifier, the SUB 9007 AS can perform in the most demanding situations. The housing of the SUB 9007 AS match the RCF D Line HDL 50 and HDL 20 array systems, enabling stacked systems