Have you used a frequency/tone CD w/SPL meter ...

Yes, some measurement of frequency response is valuable, but, there is simply no comparison between using a SPL meter with a test disc vs using a spectrum analyser (like a Behringer DEQ2496). The spectrum analyser gives you an immediate indication of any changes (like speaker or listener position). It gives you a much clearer idea of the whole spectrum.

Kenyonbm...Your results are not unusual. And what a lot of work!!! (Get yourself a Behringer DEQ2496). By the way, did you try repeating the meter measurement several times at the same spot? I bet that some of the veriation is simply the measurement. Low frequency should not vary much over a short distance. High frequency will vary.

Kenyonbm...There have been many (too many?) postings about the Behringer DEQ2496. You can also download the complete users manual from the Behringer website, as well as the sales brochure.

Streetdaddy...With the white noise signal playing,just look at the RTA display before you do any equalization. If you have a test disc you could play that instead of the built-in noise signal. You can watch the response gradually become flatter as the equalization process is performed. As Chrisla notes you may prefer a response that is shaped (not flat) in some way, and that is easy to achieve by setting up the target curve before you do the auto eq.

No doubt the professional room tuning equipment and procedures the Chrisla describes are more accurate than the simple 1/3 octave corrections done automatically by the Behringer (unless you take the trouble to use the "feedback destroyer" function which is as sharp as 1/60 octave). But in practical terms the Behringer, properly used, comes so close to optimum results that I don't think the ear could tell the difference. Certainly the variation depending on listener position will be greater than the difference between professional room tuning and the Behringer result.