I have read ithis thread and have seen only one person asy anything about the subs that hold the workd record 179.6 Pioneer TSW-5000SPL
now my $.02 goes like this

pioneer tsw 5000spl, RE, DD, Rockford's T2 15s, brahma, crossfire

w7s are descent for SQ only they reach there excursion limits with very little power applied

i have 4 t2 15s and over 20,000 watts of power on them.

I have had Alpha soniks 800series and hit 150+dbs on 3000 watts
again its on how you have the system designed