Originally Posted by avtexan
If I need them in a different place which number lines up with the best spot?
Couple of options, depending on how many columns you want to build:
Columns every 4 feet apart: Wide speakers would be 4 feet forward of main listening position (±55°), Side speakers directly to the sides of listening position (±90°), dummy columns 4 feet behind the Sides, Rear speakers 4 feet behind dummy columns, in the back corners of the room (±155°) with the columns physically on the back wall facing forward. (all angles are from the centre speaker) IF you want to match the columns on the back wall, you can do the same thing on either side of the screen, as you did in your second drawing (will be about 5 feet away from Wide speaker columns).
Columns every 6 feet apart: Wides at 4 feet forward of listening position (±55°), Sides 2 feet behind listening position (±120°), Rear speakers 6 feet behind Side speaker columns, in the back corners of the room (±155°) with the columns on the back wall. Again, you have the choice to do columns on either side of the screen, like in your second drawing, in order to have front corner columns that match the back corner columns.
Both options have the colunms spaced pretty evenly. I doubt anyone will notice that the front corner columns are 5 feet away rather than having the consistent 4 or 6 foot spacing (5 feet is close to both options, splitting the difference). Not to mention that the room will be dark most of the time. If you do front columns that are stradling the front corners (rather than flat on the front wall), then do the same with the rear corner columns (just for a consistent look).
Personally, I would choose the first option (prefer my Side speakers directly to my sides rather than behind me). Of course that's easy for me to say since I'm not the one having to build the columns. The second option saves you on building a couple of dummy columns, though I don't know if that really makes a big difference to you or not, considering you'll already be building so many columns (what's a couple more in the assembly line?). It also gets the side speakers a couple feet closer to the back row; though for listeners in the front row (main listening position) it means that all four surrounds will be behind them.