Here's my build status update:
Tucking the heights all the way up into the corner gives me 35 degree spread and around 32 degrees up.
The wides ended up at 50 degree spread, due to my desirte to keep symmetry of them.
The LH 8" HVAC pipe kept me from going more rearward on the LH side within the 24" span between concrete form studs, now if I went totally rear of that 8" pipe and the concrete stud then on the RH side I get into all my 4 circuits wiring for lights
In the 2-3 year upgrade plan, if I do upgrade to a Grafiyik eye for light control then I'd need to re-do the box/wiring there, then I'd move these rearward and be around 62-63 degrees spread.
For now, I'm just within the +- 10 degree tolerance Chris K gave.
Some pictures of final install:
This picture shows the dead flat varnish I coated the re-paint area....looks like I need to put a little more forward, they eyes can't see this or I would have of course done it.
I added that way back in 2008 to help the flat paint burnish issue
I lined the sides/back/top of the box with 2" OC703 for resonance control, and to help my bookshelf breath, since it is rear ported.
Some subjective listening by a small group of neighbors, I'll post those later.Edited by mtbdudex - 1/25/13 at 7:34am