I cannot claim to understand much of the technical details mentioned in this post, but I appreciate the information. I am running a similar configuration as well (Bose 901s w/XLS-602) and I too noticed the clip LEDs illuminating in what appeared to be strange circumstances.
If this is an unavoidable situation with this setup, what is the acceptable limit for allowing the amp to clip? I realize no clipping is ideal, but can the LED flicker occaionally without doing harm to any component? The rate of flicker seems to be less than once or twice per second. Will this do harm over time? Will it shorten the life of the amp?
I got the 901s for free so I'm going to use them in this configuration regardless of this situtation, so I'm just trying to find out how hard I can push this system without doing real damage.
BTW, I'm running this off of a personal computer with the PC hooked to the Bose equalizer, with a Rolls Promatch MB15 between the equalizer and the amp.