Modular Room-w/in-a Room HT? Think's a good idea?

Yes, sub-genius!, .. you can put fabric and sound treatments n wiring and such on the existing walls in a home, or also in the tool shed which you live in in granny's back Yard!! Yes you should do that!

The entirety of this post was centered around A MODULAR SOUND ISOLATION STRUCTURE (not permanent extensive construction to existing walls/boundaries..or your toy box), WHICH COULD BE EASILY ASSEMBLED/DISASSEMBLED INSIDE AN EXISTING SPACE - NOT MADE PERMANENT!, THUS KEEPING THE GOOD SOUND IN AND OUTSIDE SOUND OUT -SEPARATE FROM YOUR VIBRATION/NOISE TRANSMITTING HOME STRUCTURE. Have a clue yet r did you actually read ALL of the post, besides 2 lines of content?

*BTW, "CHEAP" inwall speakers suck -not expensive ones, if you researched (yes, they even have one's with their own enclosure/cabinets - sealed). And, you don't HAVE to use in'ies. regular speakers could be used in a number of fashions. Just a consideration/suggestion for convenience and clean look inside. ..not siginificant to the core of this post. But thanks for chiming in. ...love explaining myself 3x's

Avgoround,

You're the human equivalent of Pink Floyd's Dark Side of the Moon album. Every time I read one of your posts, I hear the same lyrics in my head over and over again: "The lunatic is on the grass".

I think the concept is sound; a room within a room, like a recording studio. Can you consult with a general contractor who has built recording studios? I think any prefab unit may be expensive and may not completely fulfill your needs.

How large is your listening room anyway?

Lowrider57, I actually have a couple of different rooms which I could use at my home, including a garage space. The idea would be to at least have the base partition structure fit in, say, a rather small room/space - 11'x12' , for example - with maybe at least a few inches of air space on each side of the partitions , once assembled. That would allow for some ventilation options, and connectivity flexibility to electrical outlets, openings, entrances/obstructions, and so forth in the existing room. Yes, it's true that this narrow space separation would NOT be ideally conducive to isolating bass energy, as that really requires more space between the wall spaces. HOWEVER using very thick, heavy, somewhat flexible rubber mat material as the outer partition wall boundary material just might knock enough of the bass impact down, to perhaps half the effectiveness you'd othewise have just playing bass in an attached room in any given home. Gotta be an improvement. Then, of course, if you could assemble the same in a larger space, you would get the added benefit of depth/distance between inner/outer room boundaries, which definitely would improve bass and mid range/upper energy isolation, for even better performance, yes!
Basically, the system could be either fixed predetermined size, to fit in any given space you need, or could maybe be adjustable, by fitting more sidewall panels, with some sort of adjustable ceiling system engineered into it???
Anyway, just thoughts and ideas. But I can tell you right now, that, in any typical room in a house/apartment/condo, ANYTHING would be better than simply sticking equipment into the room and expecting to either isolate internal or external sound from the outside or the rest of the home!!! That's a given.

Agreed. That's why recording studios are built that way; with sonics the priority and keeping out external sound. Those rehearsal rooms are not concerned with keeping the true sonics of the instrument, the concern is a quiet room inside and out.
I think, if you've got the budget, it could become a good music room. The alternative is constructing secondary drywall with sound absorption and wiring which amounts to building an entire room, which may cost more.

That's why a consultation with a contractor who has built studios may be a good way to start.