Yes, there is extra space for cables.
Found that tape measurer:
Mixer Section:
Width - 10 1/2 inches. There is approximately 1/4" on each side for the lip of the mixer.
Length - 11 inches - usable
- 15 inches to the back (4 inches for cables). There are also two 1" foam pieces that are glued to the front of the case. You could probably remove these for some extra space, as long as your mixer didn't have anything on the front of it.
Depth - 3 1/4 inches, level all the way through.
It seems your mixer might be just a little too long to fit. You might be able to squeak it if you had right-angle cables for the mixer side, and were able to remove the front foam pieces. Proceed with caution, your mileage may vary.
Or you could pick up a Q-MX2BPM.