Actually the only measuring I did was the following:
HSU test disc with newer analog RS SPL meter C-slow weighted prior to Anti-Mode and Traps install and measured a huge peak at around 50hz. After Anti-mode EQ, the peak was gone using the same method of testing.
Later I downloaded the Real Traps test disc that does 1hz increments from 10hz and above. This is what I started using when I was moving my Sub from location to location until I found the best spot in my room (using RS SPL meter –C weighted slow). The 50hz peak was definitely part of the room because no matter where I put the Sub, the peak was there. In some locations, it was less and more even and other locations, like the corner, it really excited that mode.
I then talked with Bryan Pape and GIK, sent him pics of my room, dimensions and gear. He made recommendations that I would not have thought of at the time like covering the back window with Monster Traps and the 244 behind the mains for SBIR
. Bryan also advised about keeping treatments symmetrical in my room and a bunch of other stuff. I also followed some “general rules of thumb” when I could afford it by treating all corners and first point reflection.
After all the Bass Traps were installed, I re-ran Anti-mode again and it had a more even response (verifying with Real Traps test disc and RS meter).
I then used the Receiver test tones and SPL meter to level set everything but running the sub about 2-3db hot. Finally, I double checked everything with the Audio Toolkit DVD
that Mark Seaton supplied with the SubMersive. Then I listen for a few hours or days and see how I like it. So far, I prefer the Submersive in DSP1/PGM1 in my room but running 2-3dbs hot.
I did re-run Audyssey a few weeks ago and then level matched using the SPL meter, Audio Tool Kit and receiver test tones. I thought the mains sounded similar vs no Audyssey but thought the bass was lacking a bit. I then measured the bass response, I noticed that the bass response from 20hz to 40hz was down about 5-6db with Audyssey, Anti-mode and Traps installed Versus with just Traps and Anti-mode. With this new location and Traps installed, I prefer the bass without Audyssey. One of the things my simple minded measurements don’t show is decay time but you can definitely hear the bass response is much tighter and smoother in the treated room.Edit:
Forgot to mention that I also measured the test tones in Dolby PLX Movie mode and adjusted the sub Distance (in my case adding 1.5ft after accounting for the actual Sub Distance and latency in Anti-mode). Mark Seaton told me about the first few weeks when I got my SubMersive but CraigJohn illustrates how well it does work here
I know these measurement techniques are not ideal and are time consuming compared to REW, Omnimic or XTZ and I may get Omnimic later to further experiment/learn but so far they have helped me achieve most of my goals in this room and have taught me a little some things while doing so.
PS...Some of the best advice I received on this forum and the Seaton forum was you telling me to contact Bryan Pape at GIK not to mention you convincing me that I should get a SubMersive! Thank You again Mike!