KTX-H10 solution that mounts to the face of the subwoofer and links for a sturdy, dual-subwoofer enclosure. (2) alpine s-sb10v loaded 10 600w s-w10d4 subwoofers+ported sub enclosure box the 10-inch enclosure is tuned to 36 hz is tuned to 35 hz for optimized performance with alpines s-and-r-series subwoofers.