Originally Posted by WestCoastD
Thanks, appreciate all this valuable info! I still have to invest into an SPL meter.
If you can't move your speakers around (if you are stuck with a certain position that they must be in in your listening area), then wasting time on measuring isn't going to make a huge difference except for treating reflection points (to lower reverberation and decay times) and eliminating slap echo in your room (assuming you can hang treatments, and don't have a wife who is limiting the speaker placement and room treatment as well).
If you can move them around (and have a lot of positioning freedom) and plan on using an SPL and some kind of small Hz increments to measure the FR, then I recommend trying the WASP method to get a general sense of where the least amount of room interference will occur. The FR measurements only become useful when you can go to any lengths once you have found the optimal positioning, especially for lowering decay times, reverberation time, fixing slap echo issues, dealing with direct reflections and more oblique reflection issues, etc. I only say so because it is actually much easier to find the optimal positioning by methods like clapping than most people think!
Trying to use an SPL, or even ETF to find the optimal positioning, without any sense of where to start, would take a tremendously wasteful amount of time. Like I mentioned, I tried the 1 Hz increments that I made and burned for myself onto a disc and measured the FR with an SPL meter, it was, as someone else mentioned, quite tedious. The WASP method was infinitely more practical and helped me locate the same optimal position that a professional acoustical engineer located later on with room acoustics programs that were created to find optimal speaker positions. BTW, I'm not sure how well it would work for surround sound though, but it works great for two channel setups.
I recommend over anything else, building a dedicated room with an acoustical engineer if you can afford to do so, or at the least having one re-engineer your existing space to work within whatever limitations you are forced to deal with, i.e. have them figure out exactly where you need to place any treatments in the room, where the speakers will work best within whatever limitations you set, etc. It will save you a lot of time and money if you go with someone like Rives as the consultations are fairly cheap as far as Acoustical Engineering consultations go (building a new room OTOH does get expensive if you basically reconstruct an entire room, as I can attest to)... I think a level 1 (consultation without post-renovation fine tuning and measurements, etc) is around $1000.
Hehehe, sorry if I am rambling on and on, and on, and on, and on.........