Originally Posted by mcascio
I'm trying to determine where the ideal speaker placement is. I'm assuming I should just use the location between both rows as the ideal listening environment. Although when you sit it either the front row or back row, the speakers aren't always ideal.
Between the Madagascar screen shot, and the fabulous 3D modeling, I'm hooked in this thread. Great design and planning.
A few ideas to offer, having just finished my first 7.1 room with two rows, I've come to some conclusions.
a) The most serious/critical listening or watching happens solo. In the money seat--front/center. When others join, the concerns over "template perfection" are relaxed. So I attached a diagram with the Dolby template shifted to the prime seat.
b) Having had the opportunity to do some serious seat time in both rows, I've come to appreciate the extra envelopment in the rear. As a result, if I had the chance, I'd move the surrounds from their current locations, 90-deg to the front row ears, to maybe 6"-12" forward.
c) The 140" screen width gives a 60-deg viewing angle. Serious widescreen effect. In that case, I'd recommend considering a 2.40 screen so that 16x9 images don't overwhelm. Unless maybe you're an Imax fan, then go for it!
This calculator spreadsheet
is real useful for checking the math. It shows that a smaller screen can also work, but then you run into the issue of the frame blocking the L/R speakers. I made my screen small enough to fit between the speakers, so it's a 42-deg view.
d) Looks like several walls/floor are concrete, which are good at keeping bass inside the room. Should enhance the room modes. My prediction is that you’ll need and want more subs. Partly for peak output, but more for improved uniformity across the seats. Might consider planning for a total of 4 subs near the 4 corners. Have a look at Fig 19 of this paper by Dr. Toole
. Could consider either something like in-wall Triad subs, or whatever powered subs would fit—and pre-wire accordingly. I had rather severe bass nulls in my room, and multiple “subs” and a BassQ processor fixed it. I didn’t try multiple subs until I had the BassQ, so can’t say if I could have gotten away with just the multiple subs used alone.