GRLA5500:
RMS Power Rating:
4 ohms: 1700 watts x 1 chan.
2 ohms: 2500 watts x 1 chan.
1 ohm: 3200 watts x 1 chan.
SSL EV5000
1 ohm 5000w x 1 Max power
2 ohm 3500w x 1 Max power,
4 ohm 1800w x 1 RMS power
2 ohm 2500w x 1 RMS
The ssl claims to be 1 ohm stable but i had it on 4 alpine...