idk how you think a 2.5" coil will hold up to 2500w reliably. much less need that much to "get off". The sa12 has been proven to be most efficient right around 900-1100w. ive had 300w from a 5 channel and it was pushing my sa nicely. the sa sub has been a tried and PROVEN benchmark for what a $200 2.5" coil sub should be.
not to mention what is up with the forte's power rating...
the 10 takes 800, the 12 1000, the 15 1250 and the 18 1500 but they all use the same coil and it appears same motor except the 18.