Well I have to say that for movie playback I don't think the centre matching is quite as critical as you think, not when mixing and matching M DSP speakers.

I have 5000's on the front and have a 5000c. I also bought a 33c, I bought it as a stop gap while waiting for a 5000c to crop up and it happend to crop up before I had eveen paid for the 33c.
When it arrived the driver was damaged so I had to get a new one fitted from Meridian, to make sure it was fine I had it playing for a week and if I am totally honest, there is very little in it for films when crossed over at 80hz.
There is a difference when leaving the sub out and setting all to large, but still not massive.

The real difference is when playing at reference level, when there is a lot going on the 5000c keep it sounding more open and less muddled, but this is only maybe 3% of a film.


Now with music in Trifield I do think the centre is worth matching up.

33 rears vs 3100 rears?? I couldn't see the point, I would rather put another pair of fronts on the back myself.

No Darling, I've had it months!