18 x 13 x 10 seems like good dimensions from the acoustics point of view.
You can spend tons of money on acoustics treatments or just get a good A/V processor with room correction (that's what I would do).
Datasat used to be SOTA years ago. But from what I have read Trinnov is the one to beat today.
As far as room within a room, that's great if you are able to do it. More isolation from outside noises and less sound waves going out.
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