wel those subs are one of the best soundig woofers available but they dont get loud, they are mainly for sq, well if u add a 100/1 and a 500/1 i think its gonna sound strange because all the amps are not made equal, u can get 3 500/1 i seen a dude put 4 10w6 with a single 1k/a and it sounded great in a sealed box not loud but great