I've been thinking about this one myself. I have an Orion, and have used my friend's Pro II/PW-1, and have been told by our resident guru that it wouldn't be wise to use the Orion/PW-2 combo, because there is no ALC adjustment on the Orion. About 16 watts of drive with the Pro II puts out around 800 watts on the PW-1, but my understanding that the low drive wattage of the exciter is not the problem. The problem is voltage transients on the non-ALC adjustable rigs. I love my Orion too, but I don't think I'd be willing to take a chance of wasting a near 4K amp just to make a point that it could be done.