i would say that w6v2 has great spl but it lacks in low end extention but also is one of the flatest cleanest sounding subs ive heard , the l7 solobaric lacks tonal quality but has great spl at the lows like no other its a personal choice of what your looking to do in my systems i use different subs to pickup different frequencies subs for 20-55 subs for 55-160 and mid bass drivers between conponents to pick up signals from the bottom to the top it depends on what your looking to do and how far your willing to go. in the past i havent heard a singe or pair of subs in a single type of box that plays everything perfect.