Hey All I'm in the process of finalizing seating locations in my theater-in-progress so I can start building my riser and such. Been plugging away at the Stereophile Guide to HT spreadsheet and would like someone to confirm my results before I lock this puppy down. I tried loading my complete sheet to my website but ran into technical difficulties, so if someone could plug the following numbers into theirs and offer thoughts that would be great. ROOM DIMENSIONS Length @ 23'8" (284") Width @ 16'4" (196") Height @ 8' (96") SEATING DISTANCE From back wall @ 152" (11' from front screen) From side wall @ 83" From floor @ 44" Based on my interpretation there seems to be only two problem frequencies at this location: 214.7Hz and 241.9Hz, both peaks and easily attenuated. What's more, when I plug in the locations of the remaining front seats (at 57", 104", and 128" from the side walls respectively) they share the same peaks at seats 1 and 2, only the 214.7 peak at seat 3, and the 214.9 flips to a null at seat 4. For the back seats (same distances from side walls, 69" back from the front seats, elevated 12" compared to the front seats) 167Hz replaces 214.7Hz as the problem peak in seats 1-4, and 241.9 repeats in 1 and 2 as peaks, 4 as a null just like the front row. So if I'm reading this correctly, for all eight seats I have three peaks to contend with (214, 241, and 167Hz) and one null (241). The biggest problem I see is for the "cheap seats" at the far right in both rows where they not only have the natural 241Hz null but it will be completely exacerbated by the correction of its peak in seats 1-3 in both rows. But those aren't my seats so I'm not concerned. There are other problem frequencies noted in the room but if I understand correctly the ones I'm concerned with are located where people actually sit. Another question: what other information can be gleaned from this spreadsheet? How can it be used to determine the best locations for speakers and subs? This is a rectangular room but there are jogged sections at the front and a bulkhead around the ceiling perimeter. For the sake of this analysis I have ignored them and just used the longest dimensions. Don't know how that will affect the final result. My original seating position was at 12' from the screen but that introduced a PILE of trouble areas. The movement up one foot made a big difference. This also determines my screen size which is now looking to be 87" wide 16:9 (previously planned for 96" wide but at 11' distance that's a 40 degree viewing angle and maybe a little too extreme). All thoughts would be greatly appreciated. Thanks. FYI, here are pictures of my construction in case they may be of help.