Great subs...... I used a 750.1 Autotek Supersport for a few weeks when I had 1, then put a Autotek SS1900.1D on them. I'm sure they can take more, but I had to get what I could afford.
I had a hifonic bxi 1606 on them slot ported box @ 1ohm tuned to 30hz and they pounded big time. Now just bought a hifonics 2608 (2600w rms) as I felt they needed much more to drive them