Wharfedale DELTA-AX18B Active Subwoofer With DSP And 1000W RMS - 18"The active subwoofers of the Wharfedale Pro Delta AX series offer the highest level of professional features. They are used for low end support of active full range speakers from the Delta AX series and can also be combined with other manufacturers. The basses are particularly popular in the DJ and touring sector, because they can do more than you would expect in the price segment. Features 18" active subwoofer Control of the low pass filter Hi Pass