In order to meet it's spec of 1250 @ 8, the 7500 it only needs 100vRMS.
sqrt(1250w * 8ohm) = 100v
sqrt(2022w * 4ohm) = 90v
sqrt(3750w * 2ohm) = 87v
Assuming the power supply could provide the amperes needed.
For the 12k:
sqrt(1700w * 8ohm) = 117v
sqrt(3400w * 4ohm) = 117v
sqrt(6000w * 2ohm) = 110v
So the 12k needs to reach 117v, otherwise it ain't to spec.
The Crown iTech 8000:
sqrt(2100w * 8ohm) = 130v
sqrt(4000w * 4ohm) = 127v
sqrt(3500w * 2ohm) = 87v
What I actually measured from it was 148v, so it has enough voltage to exceed it's spec. It was independently tested as being able to do somewhere around 9-10kW.
If the iTech 8000 had a slightly better SMPS with a less aggressive limiter it would actually beat the PowerSoft K10; and for the first 2 seconds at dual 4-ohms it actually does beat it as-is by 2000watts total.
As far as bursting goes the iTech 8000 is a monster, and for bridging into a 4ohm load the K10 is a monster (12-15kW for 1 second).
At 8-ohms for the first 80seconds the iTech beats the K10 by about 800watts total.
On Average both of them can do about ~5-6kW for about ~1minute, give or take. Which is a lot of power for a coil to heat up with.