This could be a one row seating option that uses speaker grill fabric cloth, as wall surfaces, and in wall surround speakers, in backer boxes
for sound containment.
It could be a pretty interesting budget build, if it used five stadium rocker seats, and simple speaker grill fabric walls. A SeymourAV XD DIY AT screen
wall would hide the front speakers, and the fabric walls would hide in wall surround speakers, in backer boxes. If you don't extend the fabric panels all the
way down to the floor, then you could work in some LED down lights around the back wall and side walls. Now you could use backer boxes for some
in ceiling spot lights, and that ductwork could frame a soffit up front and then work in some screen spots. The front wall could be a plain and simple black
speaker grill AT wall, and a sand filled stage in behind. That's how my current room is, which was done because of a 80" soffit over the AT wall. I wanted a stage
but figured it'd mess with the scale, and look crowded. My next space will be bigger but it will be stage-less, as I've come to appreciate a screen with no design
That angled wall could create a small lobby, and be a feature wall. And still give you some space to finish a nice laundry room. I am thinking my next space will have
a horizontal run wood wall, some spots, stand off theater name letters, and an embedded digital movie poster light box. That will add a little design flair to what will be
a pretty hard core performance driven theater that will be my next theater. I've been slowly edging that way over numerous remodels, but can't quite subscribe to a black
cave look. Some texture in the fabric walls, and some nice zoned lighting, will be what keeps my next room a step or two out of the "black cave" category. I've been thinking
of simply using Unistrut channel to mount home built fabric panels to the walls (to allow for them to be removable) plus create some depth for LED down lighting.
A little entry bling project, that is almost budget considering what
a 40" hdtv can be had for. I got a little carried away with this, to see how max'ed out I could get it, but it also could be a sub $200 project.
As for the speaker grill walls, I like Art Install's small rooms. I'd nix the gear up front, and do a proper AT space to disguise some of your ductwork. Rooms like the Bauhaus, Loft,
Lego, and Crystal really work the lighting as design elements.
There's not a lot of single row rooms in North America, but they seem to be more popular across the Atlantic. The JBL demo room also uses panelled fabric walls, and employs
stadium seating, and it's actually a cutting edge room, despite it's simple looks.
Could your office be a little open concept? I could see a nice built in desk on the theater wall, and some sort of open shelving built in under the stairs. Or some simple shallow media shelves backing some office cubby space, under the stairs. That would open up the office foot print a little, and maybe let you put a little more space into the utility/storage space. And maybe a nice laundry room gets you a little bonus points, for the theater.
That is a rather nice basement and your want list is very realistic, for it. You could build a simple but high performance room, in that space, and you could achieve reference levels with
dome tweeter'ed speakers, since the foot print is reasonably compact. The seating for five also makes for simpler cooling needs.
BTW, you really don't want second row seating on the back wall, and right on top of the rear surround speakers. You need some physical separation so individual surround speakers aren't pulled
out of the surround sound mix, and you ideally want at least three feet off the speakers. Stadium seating might get you a compact enough seating to have 2 rows of 4. One nice thing about a single row is you can plant the seating around the 2/3rds mark, and easily have the seating off the back wall. Four feet off the back wall and surround speakers is a nice luxury to have, though.
Anyways just throwing ideas at you...
BTW, where the future addition going? That could be a factor with future traffic flow.