Earlier in this thread
I spoke with the Behr rep, and they agreed my idea doing a "test" zone for comparison flat enamel vs eggshell vs satin. Based upon that review to buy (reimburse) me up to 5 gallons of paint, 2 gallons of flat poly (If I really-really want that), plus $30 in supplies - of course as long as it's Behr paint. They admit Behr does NOT make a true flat poly, so another brand is acceptable.
Here is my test patch painted last week, and dried for 7 days.
You can see where I painted Satin, Eggshell, and flat enamel (which my side walls had originally) on either side for comparison purposes
LH side wall direct shot
LH side wall from 2nd row:
Pictures "in movie mode", these taken while watching Star Wars I: The Phantom Menace with my 3 kids tonight, all on tripod w/o flash:
This taken with ISO 1600, LH most side of 2nd row
This taken with ISO 200, LH most side of 2nd row
This taken with ISO 800 (1600 too washed out/noisy pict), RH most side of 2nd row
This taken with ISO 200, RH most side of 2nd row
Definitely glad I did this test, Satin does have too much sheen and reflects more light than I suspected, Eggshell is on the border of acceptable tradeoff sheen/reflecting light vs more durable than Flat Enamel.
Hopefully this little test/picts posted helps others:
a) I'd say never choose Satin for your side walls in a Home Theater, too much sheen/reflection
b) Even eggshell reflects more than I thought, YMMV is you choose eggshell for side walls. Since I'm going to put acoustic treatments at 1st reflection points, 2 panels/side wall, most likely I'm going with Eggshell.
You people who do the full acoustic treatments floor/ceiling obviously don't have this problem (I realize you stop the 703 @ ear height and above that is cotton batting behind the GOM).
c) Obviously flat for ceiling is best, just be careful about touching it afterward
d) Be VERY CAREFUL when you clean your walls
Others in this thread seem to have success with flat/flat enamel in other brands, so my choices are:
1) Stick with Behr, have them pay me for their paint brand re-painting (materials, not labor)
2) Go with another brand, pay from my own pocket
Most likely, I'm going with choice 1) at least $100 I'll "save", and I learned the cleaning issue the hard way.