Is the HP to gain output or protect the driver, or both ? I own (4) 1450's, they put out a good deal of current before any sign of clipping. I only clipped them once when i made an error EQing, my bad.
Nothing like clipping all four Adcom 555mkII's bridged, they gave up pretty quick LOL.
3.5cu ft sealed would be great, the RMX1450 would power that fine, then get ahold of a MiniDSP, plenty of EQ power to do everything and more, if you have the gear to measure with. Do you have measurement equipment....
As of Jan 2017, im still looking for (1) Outlaw M-200 mono amp, and a used Marantz 7010