I knew a kid local to me that was running 2 of those 15s on some ****** "4k" amp.. He was bragging so bad how he was running 1700 watt rms subwoofers and a 4k amp and laughed when I told him the DCs were 900rms each and on a 2200rms amp. (at the time I was running 2 DC lvl3 18s on 1 AQ2200) All his little friends were talking **** until I let them hear mine. They were shocked.
I get text ever so often from the kid and he bought a Soundqubed HDS15" from me last month.
Oh yea... Those PA subwoofers were probably the worst sounding subwoofer I've ever heard...