Hi TonyN,
The low frequency roll-off will not be an issue as no doubt you are crossing into a subwoofer. The M5HP does have a lower sensitivity so you will need a bit more power to get to the same volume level. Three identical speakers behind an acoustical transparent screen is a nice combo. I think you will like that. There is an option to use our in-cabinet speakers back there also because we can make them whatever depth you need. This would make it possible to go up to three M80 in-cabinets used as in-walls behind your screen. This would give you more sensitivity than your M60s and more dynamic capabilities. Thought I would throw that option out there.
