So, I checked the crossover setting that my Denon AVR-X4200W came up with. It had my GE Sevens set to full-range and my Center Channel at 40Hz, indicative that those speakers do an awesome job of playing full range content. This is with a Def Tech 15" subwoofer in my theater (cant recall exact model #)

My Invisa 650s were crossed over at 90Hz, which only just misses the THX recommendation of 80Hz. I can't quibble with that for an in-ceiling speaker.

My Phase Tech surrounds were set to 120Hz, indicative that a 5.25" driver can only go so low, especially when couple with a slender on-wall profile. That slender profile was the reason I went with them in the first place, but I'm hoping an in-wall will give me something closer to that 80Hz crossover, to minimize subwooofer localization effects (bad when the subwoofer is in the front and the speakers are behind you). Also, with an in-wall I go from slender profile to no protrusion whatsoever.

The PhaseTechs do play plenty loud though, and the second tweeter probably helps in this regard.

So what do you guys out there end up with as a x-over setting for your MPXs. I'd be surprised if they end up any lower than 120Hz, but with Sandy's magic, you never know.

If you have a sub the front Triton Sevens should not be set to large, you are losing lots of headroom that way, for no good reason. For Home Theater I would set to Small and 60 to 80Hz. Center to 80Hz too unless the sub is in some strange place, then maybe 60Hz.

The MPX will be happy to crossover at 80Hz.

If those settings were created by Audyssey I would suggest you go back and wipe all that out and start over doing a manual setup.

Moderator wrote: If you have a sub the front Triton Sevens should not be set to large, you are losing lots of headroom that way, for no good reason. For Home Theater I would set to Small and 60 to 80Hz. Center to 80Hz too unless the sub is in some strange place, then maybe 60Hz.

The MPX will be happy to crossover at 80Hz.

If those settings were created by Audyssey I would suggest you go back and wipe all that out and start over doing a manual setup.

All great advice. In fact, I had done just those suggestions after I ran Audyssey a couple of years back. However, I had to re-run Audyssey recently after I added the Invisa 650 Atmos speakers. I had forgotten to check the results of that Audyssey set-up until this discussion spurred me to go & check my x-over settings.

If the MPXs cross-over at 80Hz, I'd be happy, but I'm guessing (and it's just a guess) that they'll end up close to the setting of my current surround speakers. Probably somewhere in the 120 to 150Hz range. I haven't see any lab test of these speakers and most reviews refrain from testing in-wall/in-ceilings because of all the variables involved.

If the Invisa MPX is installed in a full stud bay you can expect them to be room flat to 40Hz. I am not "guessing" at that number, I have a pair installed for my 7.1 rears.

Moderator wrote: If the Invisa MPX is installed in a full stud bay you can expect them to be room flat to 40Hz. I am not "guessing" at that number, I have a pair installed for my 7.1 rears.

WOW (pauses to tip hat to Sandy).

I knew that the wall enclosure acts as a large cabinet to boost low frequency response and that the GE (like most other) in-walls are designed to take advantage of that boost but I am still amazed that two 4.5" drivers can get significant output below 80Hz, never mind down to 40Hz.

I'm feeling better regarding the prospect of adding 4 MPXs to my theater, to replace the existing side/back surrounds. I was wary of the small driver set and was looking at something like these Martin Logans to provide a reasonably close timbre match, ina more substantial unit. If that MPXs can go that low and play loud while doing so, I don'e see any reason to mix brands, given the identical pricing.