For those that had/have some of these subs, i know the specs say 400watts nominal ratings, but in the car audio mag. they vance/? did a review on this sub. on his setup he used a zapco c6k amp pushing 2000watts into the sub really didn't mention if he used one or two. anyways i have 3 of these babies, and of course using only ppi art amps(one of the best). using 2 subs, i was going to run an a1200.2 (1200watts/4 ohm/briged mono) for the 2 subs or use 2 a600.2 on each one. so i was wondering for those who had/have these subs, how much wattts were you able to feed into this sub.? and sound quality?