I would imagine that at calibrated levels the sub wouldn't clip. I wonder if the improvement of the 2.4k amp, as noted my many, is more to do with added control the extra power brings, ie it can respond, push it harder and faster, stop it and pull it back quicker.
Just a thought
Part of Mark's original HP Amplifier Upgrade Post:
The new US sourced amplifier
is quite the beast, and effectively eliminates any hard amplifier clipping under any condition I've found thus far. Obviously there are limits past which it won't get any louder, but those are higher than the original SubMersive and it is even more graceful when it does reach that limit. Where the most benefit is realized is below 16-20Hz, but there is benefit across the board. The new amplifier does not make one SubMersive HP equal to a pair of originals, but it does make it better. Addition/update:
With the added robustness and tolerance to over-driving in the new amplifier, I have also put the second DSP program to use. This relates to the PGM SEL, two position switch. While I still recommend the depressed (IN) program for most, I decided to use the extended (OUT) position of the switch to shift the roll off deeper to better match larger rooms or those who listen at lower levels wanting more lift to the bottom end. The response below 15Hz is parallel, but higher in level to the original response, with the +/-3dB window shifting down to 15Hz vs. the 19Hz of the original.