The new and radically improved SPLX-HX subs are welcomed by SPL competitors worldwide. While the changes may only appear to be cosmetic, the cool stuff is on the the inside. The new coil costs nearly 8 times as much as the original coil, but the results are unfathomable. Gaining a tenth of a dB sometimes can cost a fortune, but it may be what is needed to win a competition. Gaining several dB is like hitting the lotter! For the competitor or everyday basshead that does not have unlimited funds, this monster is for you.