Thinking about in-wall subwoofers...

The alternative being a giant box which my wife would hate, and more expensive and when would I ever get to that. Now I know well the wall is not the greatest "enclosure" but then again
  • I had 8" in-walls in a previous house, and my brother does now, and it's not the end of the world.
  • I could fit certainly 4 quite possibly 6 in the available stud bays, possibly mounted higher and thus pretty hidden by the TV (now 75"...85" coming). Thus the pressure in each cavity and the motion of each woofer would not be so much.
  • I see various grilles which could suit
  • But mounting, ha ha that's the joker. There are some actual in-wall subwoofer kits not expensive but performance unknown and no parameters and 10" max. Whereas there are certainly 12" shallow enough to mount in a wall with parameters yielding maybe decent results in the large stud bay "enclosure." Screwing a 12" into drywall seems dubious-thoughts?
Or any other thoughts?
6x12" seems like a lot of cone area, heh heh
Oh and I'm thinking by necessity small woofers on the side of the TV-Arendal 1961 would have been PERFECT but are gone gone gone. So a big advantage to in-wall is I could run the woofers up to 150-200 Hz which would better match like a Genelec 8030 or maybe JBL CBT 70J-1...
 
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Do you know about (double) bass arrays? What you think about is one of the best ways at all to create low frequencies in a room!

How is your wall construction? Give us a sketch.
When you want to do it properly you very likely need to strengthen the given structure ... what is possible to do? Just cutting a hole in one layer plasterboard is not strong enough.
 
Or any other thoughts?
I'd agree screwing a 12" into drywall, or depending on drywall cavities will be problematic if you want loud sub levels without lots of noise.

You would probably want the top speakers to be flush or a bit in front of the TV screen to avoid diffraction.
Assuming the front of the top speakers are ~8" from the wall, with a 3" depth TV, there is around 9 cubic feet/250 liters (gross) hidden behind it, without cutting any holes in the wall. Well braced 1/2" ply could be used for cabinet construction.
A few more inches off the wall, and a lot more volume opens up, and larger woofers could be side mounted without going wider than the top speakers already extend.
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Making "L" shaped cabinets, the volume available behind the TV could be used, and a single fabric grill matching your wife's decor choice could cover the speakers on either side.
 
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I presume that means opening the wall?
From the installation manual on Support page:

"The Fathom IWS enclosure is designed to suspend from a single anchor
point inside the wall cavity of 16-inch, on-center stud (aluminum or wood)
construction homes. Once installed, the enclosure will “hang” snugly within
the wall cavity. The enclosure has various spacers and padding applied to
specific areas, allowing it to only make gentle contact with its surrounding
wallboard surfaces."

I wonder how high in frequency that goes
Spec page says:

"Frequency Response (Anechoic) 26 Hz - 101 Hz (± 1.5 dB) -3dB at 25 Hz / 112 Hz -10dB at 22 Hz / 150 Hz"

and

"Filter Slope(s) 12/24 dB/octave
Filter Frequency Range 30 Hz - 130 Hz"
 
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I presume that means opening the wall? And yeah if I was going to spend that much I think I would build external. I wonder how high in frequency that goes? Paradigm had a unit (also not cheap) with internal opposed like 3x9" woofers for force canceling-discontinued now anyway.
Drywall/sheetrock is one of the cheapest building materials available and super easy to work with. If you’re gonna do this, do it properly. And jeez, the stuff is so easy to work with.

But you’ll need to know the depth of each stud cavity. Could be 3.75” which limits what drivers you can use with the mounting depth restriction. The Auto sound world has lots of shallow mount sub options available.