If you are looking for 2500w rms than use the Alpha MAX it costs less and will handle the 2500 np and will also sound better.
For actual guys who ran both of the subwoofers side by side go to USACI's form and ask. I think there is around 5-7 guys who set records after changing to HW's.
Just from personal stuff i have used at shows for hours upon hours straight is the following.
I had three single spider HW on two RD5750's at .8 strapped, .4 each amp, 10 group 31's and three mechman alts.
I would turn in all the way up 153+ on the dash and walk way from it sometimes 10-15 mins at a time until the alts had to cool down. Never smoked a sub and only smelled them a couple times.
This is a SINGLE spider version with a 65mm tall coil. Not 100%on actual power but it was two 5750's @ .4 each with all that electrical and alts set @ 15.2 never dropping lower than 14v.
Alpha MAX with single spider, one d9 same batts and alts @ .375 daily all day long.
My boxes were also built like fort knox but with correct boxes and clean power the HW or Alpha MAX will surprise you.