Talk but not walk?

MG, I (bdp24, not dbp24; bdp for black diamond pearl---my favorite vintage drum shell finish, and 24 for the diameter of my bass drums in inches) intentionally didn’t include your acoustical products, fine as they are (I have your Room Tunes, Corner Tunes, and Echo Tunes), in my list of those to use with planars because I was speaking specifically in terms of diffusion of their rear wave. You don’t offer QRD or Skyline type diffusers, do you?

It’s a fluid situation in the room. The whole dynamics of speaker locations, listener position, the size and shape of the room and type and number of room treatments, among other variables, combine to determine the sound quality, all other things being equal. But as I pointed out in my last post, all this *uncertainty* changes when you employ the speaker set-up track on the XLO Test CD or similar Test CD. Using your own ears - move a little/listen a little - to try and find optimum speaker locations is bound to fail. You might find locations that you deem better than when you started but they won’t be the very best locations. There are a million possibilities. People get it into their heads that speakers should be far apart for a wider soundstage and toed in toward the listener. You will discover when using the Test CD that is actually not the case at all. Generally, most speakers should be closer together rather than far apart.

In any case, for those who experiment with room treatment and other tweaks like vibration isolation, etc., you need to re-visit the speaker set up track *every time* to add or change room treatments or tweaks. Otherwise, things can easily get out of control. Complexity is not your friend. In fact, the best course of action - remove all room treatments from the room, and using the out-of-phase track as a guide, slowly introduce the room treatments back into the system, moving the speakers as required to get the best results from the out-of-phase track. Then, placement of diffusers, absorbers, Helmholtz resonators, tiny bowl resonators, crystals, what have you, is a snap.

It also helps to have a SPL lever meter and test frequency track on hand to be able to map out the 3 dimensional space of the room to get a handle on where room treatments should be placed initially. For example, Tube Traps are sometimes best when placed a foot or two *away* from the room corner. It depends on where the standing wave sets up in a given room. There’s also the empty box trick for locating standing waves and similar sound pressure peaks in the room that can be employed.

Going back to what MG wrote: "" when you get out from underneath these audiophile prescribed myths. Keep in mind that the folks making these myths are folks who themselves are only theorizing. If they haven't gone and done they are doing the same thing that the "talkers" here are.  ... There's a big difference between drawing drawings and talking theory vs actually doing. ""      
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Which was the original start of this thread. When I wrote I did my speakers my way, not the theory of the 5m/10ms, seemed like the theory had to be defended by the person who mentioned it, rather than accept what worked for me,  it just is someone's made up theory and I find it to not be of much use. (sure it is true 10ms takes 10m however in practical use, it does not correlate to a 5m distance from the rear wall)  
That is the thing with notions. Once you have them IN YOUR HEAD, folks tend to defend them, like personal property. So I really liked this thread.. as it brings to the fore problems of dogma, and the stuff folks just carry around.. preventing them from looking at problems in a fresh way.

I'm enjoying this thread.When others post about actual experience even when it's the opposite of what I believe to be true,I'm open to learning more about it.Instead of "Oh that will never work!" I'm in the camp of "Hmm,gotta investigate further".