Sub crossover freq for MMGs?

[Feanor]

That is assuming you use a line-level crossover so you feed you amp and hence the MMGs only the >80Hz signal. I don't recall you amp set up, but to this your need a preamp/main set up or "main in" connectors on your integrated or receiver.

You have a good sized room while the MMGs have a limited "loudness" capability for rock or classical orchestral crescendos or the like. Setting the crossover high, (80Hz), largely compensates for this shortcoming. If you have a decent quality sub, (which you do), setting it higher would be better still in this regard, but you will begin to loose stereo separation so it would be a trade off.

[JoeE SP9]

I agree. I think 80Hz is an excellent frequency to start. It takes the burden of low bass off the MMG's without getting into the area where directionality becomes a factor.