As far as the XES is concerned:
3/4 way crossover, selectable crossover points, 72dB/octave slopes, as well as time alignment for each channel with the X1 unit. There is a parametric EQ included in the P1 (Command module)
Toslink in and I believe there were 20 bit Burr-Browns on each channel. They may have been 16 bit, though. I had one of these setups for quite a while. It used what is by far the most ergonomic remote ever developed for car audio (IMO). Another possible bonus is the X1 may be able to be controlled via PC with a unilink emulator. This unit would function on a standalone basis if that was the case, and be very attractive to the members of this forum.
This system also used Unilink for control, and has a niche following currently as far as modifications go (XM/Ipod control.) Here's a reputable forum:
http://www.rush2112.net/phpBB2/viewf...55cfeff063f71b
The XDP4000X (Screwed up the model # above. It's been a while..) was a very similar unit as far as functionality, but I can't recall the differences.
I have a friend currently running the ODR, and it has similar functionality to the XES setup, but with fewer boxes.
I will be running the P9 stuff in the install I am planning now. Hopefully I will get a thread started in worklogs over the next couple of days.
I realize you weren't necessarily looking for all of the options, but I figured I'd toss out a few SQ heavy options for those on more liberal budgets.