owners manual for 10.0 shows:
25 x 2 @ 4ohm
100 x 2 @ 2ohm
250 x 2 @ 1ohm
500 x 2 @ .5 ohm and ,25ohm
50 x 1 @ 8ohms
200 x 1 @ 4ohms
500 x 1 @ 2ohms
1000 x 1 @ 1ohm and .5ohm
i've been running mine from 1-1.5ohms for over a year and have had no problems. it does get very hot but i heard it will automatically reduce it's output when it nears it's limits(i haven't gotten it that hot yet i guess).