So, I went the easy route. After a quick study online, I headed down to my local art supply and bought a 3x5 foot panel of 1/2 inch black foam board ($12) and a can of spray adhesive (appropriate for photo paper $7). Laid everything out on a flat area. Rolled the poster up on a 2 inch round sleeve. Sprayed the whole board and let it set for about a minute. Started unrolling and used a plastic spreader knife (4 inches wide) and went to work unrolling and pushing out the bubbles. I trimmed the excess board away and hung it on my wall with 2-sided tape. Perfect!? Well, not quite. My wife was the first to notice that the direction of the apparent sound on the photo was opposite the sound coming from my speakers. Could have put it on the opposite wall and fixed that, but a pesky thermostat complicated that idea. Oh well. But it looks great, and I'll get to enjoy it tonight when my buddy comes over for a listening session. May have to turn it up a little extra loud tonight to get the full effect!
Thanks for all the input.
Thanks for all the input.