I noticed some odd crossover function as well with the fronts set to large. I didn't bother to detail much about it since I went with setting fronts to small.

With fronts set to large and sub = L+R/Sub, if you "roll over" the crossover setting from the high setting of 200Hz to the lowest setting the bass is turned up, and that's not what I would expect.

But, if you then bump up the crossover setting to the next highest freq. and then bump it back down to the lowest setting, it works as you would expect and the bass is not enhanced.

What I mean by "rollover" is that you simply push the up arrow button and cause the 990 to rollover from the highest crossover setting to the lowest.

I figured this was a software glitch, just not one to bothersome to me.

Hope that helps..