Do you need a speaker box in the ceiling to mount these or do you just cut a hole in the drywall and install them?

Its been a while since I installed mine but I do recall the instructions telling you to allow a moderate amount of space around the speaker; something like 1 foot by 1 foot. You do not specifically need a speaker box but your ceiling construction will affect the acoustics so if you find you have no bass, you may need some type of enclosure or baffle behind the speaker. I have four of these speakers installed in a 8 foot flat ceiling which has my attic space open to it and they sound great; one speaker mounting hole is secured to a 2x4 attic beam and the remaining mounting holes are secured to just the drywall. I left the fiberglass insulation in the attic so that it rested on the back of the speaker and again, the speakers sound really good. I also have a 10 inch subwoofer in the living area to handle the real low-end sound but these speakers provide a solid thump which sounds great.

Has anyone used them in a home theater, preferably in an Dolby Atmos setup?

Using 4 of them in a 7.2.4 Atmos setup and they work perfectly, The tweeters are even adjustable so you can point them as I had to do since my ceiling is vaulted hip style. Everyone even the least technical people who never heard of atmos of dts-X walk away impressed.

\Which makes a better frontspeaker set up. 3 or these or 1 MTM with a 6.5 or 8 for left and right? How about these for rear speakers too. I like the idea of 5 identical speakers, but not if this isn't a suitable main (with a sub of course).

I went with 8" for front right and two rears and the dual 5.25 for center. If I were to do it again I would have done two 8s for the center. The duals sound good but need a little more of the lower frequencies

Micca doesn't make towers with 8 inch drivers. I was thinking of buying these and building wooden towers using mdf or something. Bad idea ?

If you are wanting a two way system with a single 8" and tweeter, it should work fine. I'd stay away from any kind of venting unless you have reliable Thiel-Small parameters, but I would definitely recommend stuffing the box with AcoustiStuff or similar. I don't recall if Micca published T-S numbers for the woofer, but since it's made to go in a wall, I presume it's designed for a fairly forgiving infinite baffle alignment. Good luck!

Power Source	Corded Electric
Speaker Maximum Output Power	150 Watts
Subwoofer Connectivity Technology	Wired
Connectivity Technology	wired
Audio Driver Size	5 Inches
Audio Driver Type	Dynamic Driver
Item Weight	6.27 Pounds
Item Dimensions D x W x H	3.5"D x 15.4"W x 8.3"H
Unit Count	1.0 Count
Impedance	8 Ohm
Number of Audio Channels	2.0
Compatible Devices	Television, Projector, Home Theater Systems
Speaker Size	5.25
Woofer Diameter	5.25 Inches
Tweeter Diameter	1 Inches
Processor Count	2
Specific Uses For Product	Home Theater, Whole House Audio
Controller Type	Corded Electric
Color	White
Is Waterproof	FALSE
Warranty Type	Limited
Control Method	App
Audio Output Mode	Surround
Mounting Type	Wall Mount
Material Type	Composite
Speaker Type	Center Channel
Recommended Uses For Product	Surround Sound, Whole House Audio, Home Theater
Subwoofer Diameter	5.25 Inches

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