The first thing that occurs to me is that fitting that much seating in that space is going to be really tough. Normally, I'm of the school of thought that you should figure out all the details of that sort before you start buying equipment and running cable. In your particular case, I think it might be practical for you to try some things out before you start spending a lot of money or opening walls or anything.
Your expectations are the biggest unknown for me at this point. There's a lot of variation among the ways you could potentially go, balancing number of people, accoustic requirements (especially including sound isolation), and budget - not to mention screen size and aspect (though, for me, that is part of the calculation for number of people).
So, unless you can say with a great deal of certainty where you stand on those three (or four) points, I'd suggest setting up some equipment temporarily and seeing how many chairs you can fit end enjoy sitting in, and what the sound is like (both in that room and the rest of the house). Do you have any of the equipment you plan to use, already?
Others may give you specific recommendations - and that's fine - but your expectations aren't clear to me, and my impression is that some of them (your expectations) may not be realistic.
Fred
Your expectations are the biggest unknown for me at this point. There's a lot of variation among the ways you could potentially go, balancing number of people, accoustic requirements (especially including sound isolation), and budget - not to mention screen size and aspect (though, for me, that is part of the calculation for number of people).
So, unless you can say with a great deal of certainty where you stand on those three (or four) points, I'd suggest setting up some equipment temporarily and seeing how many chairs you can fit end enjoy sitting in, and what the sound is like (both in that room and the rest of the house). Do you have any of the equipment you plan to use, already?
Others may give you specific recommendations - and that's fine - but your expectations aren't clear to me, and my impression is that some of them (your expectations) may not be realistic.
Fred