You dont have to worry about blowing those subs. My cousin has two of the 7500 12's running off of a MTX 81001D. Its around 1500 RMS. In a slot ported box. The box sounds like its too small though. Those subs are rated at 600 rms a piece. This amp is underrated like the subs so I know its putting out more than 1500 watts. Its very loud and the subs take it well. If I were you I would get the 8500 if you really want them and put atleast 1500 watts on them and they will be fine. They might even want a lil more power. Dont worry about blowing them.