Managed to jockey things around and get the 990 set up and A/B'd it with my existing pre-amp in stereo bypass mode. After figuring out the little graphic on the left that indicates the speaker configuration, and putting the Front L/R in large with no sub, I was quite impressed with it's transparency. This was one of my greatest concerns when buying a new pre-amp. Now I'll drag out the old Stereo-70 for the surrounds while I'm waiting on the 7125. Just one general question. . . are there any issues with switching the 990 from stand-by to ON with the PA's already turned on?