Irregular speakers setup questions

[wargreen]

Hi,

I plan to use some of your plugins for a theater show, and some questions remain.
In live situation, we mostly have an arbitrary speaker setup. In this theater, we have a 11 channels setup, with LCR PA, LCR delay line and 5 points around the audience. One additional channel for the subs with cross-over around 110hz.

This is obviously sub-optimal for a correct ambisonic reproduction... But :

Is AmbiDEC adapted for this kind of situations ?
Is a real difference exist between decoders what take radius of the position's speaker in the process matrix generation (as ADT for Fons's Ambdec) and AmbiDEC ?

For use case exemple, the SPAT Revolution or Holophonix, L-ISA processors use any arbitrary speakers setup. What do you think about the comparative perceptual reproduction ?

And finally, what AmbiDEC config can you recommend for this usage ?

For political and creative reason, i want to use only FLOSS for my shows.

Thanks for your insights.
Regards