My 2¢ - 14.4v @ 2ohms is 100w.
I would use a -5db tone and set the voltage on the amp to 15v. This should keep you at or near 120w @ 2.5ohm and I doubt there will be any clipping. Should be pretty clean. Just remember, that is on a tone that you are hitting those wattage's with, on music you will safely be using 85 - 100w 99% of the time if you play it LOUD.
