So if I understand, you have a large theater with a non AT screen so the center channel needs to go either below or above the screen and there’s not a lot of vertical space available?……so you were thinking horizontal MTM for the power handling to keep up with your mains at 120db dynamic peaks?……correct?
If this a proper home theater, then the center channel only needs to play down to 100hz as you are using subwoofers which would likely be located under the screen across the front sound stage, correct?
If the above is accurate, then you don’t need an MTM at all…..a single 15” coax with a slightly angled front baffle aiming at the listening position is all you need.……..ported and tuned to 100hz with a high pass filter to protect the driver from over excursion. You can still keep your subwoofer low pass filter at 80hz since the center will be so close to either the floor or ceiling…..there will be boundary reinforcement on the 80-100hz region from the bounce
I would use this coaxial woofer
https://usspeaker.com/Eminence KappaLite KL3015CX-8-1.htm
I would choose a compression driver with a large diaphragm for the power handling and the required low crossover point of around 1.2khz. Everything is a compromise so there the response above 15khz won’t be great and that’s ok, you’ll have the floor or ceiling bounce anyway.
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