Hi everyone, I hope you're all having a nice Xmas holiday.
I just wanted to post a quick update.
First of all, thanks again for the guide, it's such a fantastic resource and a great time saver.
Because I'm doing tests at the moment with my 3311 to be ready to calibrate properly when my X7200W arrives in the next couple of weeks, I'm not going to waste your time with interim measurements.
As I'm expecting XT32 to be much better than XT, it's also more efficient to see how the new Audissey can improve things.
What I've done until now is optimize my sub placement, speakers crossovers and check the effect of various pieces of furniture.
Unfortunately my room is quite small so although it is dedicated (and entirely black velvet covered) I don't have much flexibility for speaker placement or room treatment.
I used REW to decide between left corner or between FL and C for the sub (latter was much better) and also to find the best distance from the front wall for the sub. I settled for about 3 inches. I also used it to optimize the crossover for the front and centre speakers (I settled for 60Hz/small for the front and 80Hz for the centre, vs the 40Hz large/60Hz small Audissey default).
Just doing this was invaluable!
I then tried to see how I could tame some dips I had between 100Hz and 200hz on the centre speaker and it looks like they are completely connected to my recliners which feet are about 3 ft from the centre speaker when extended. That's probably going to be my biggest issue, as XT doesn't do much about it. I'm hoping XT32 will do a better job. The dips almost entirely disappear if I fold the recliners, but that's not a very realistic use.
The other issue I'm going to have to deal with is some ringing revealed by the waterfall graph but again I want to see what XT32 does with the X7200W before wasting your time with this.
The last thing I did is generate a 90 degrees file from my standard 0 degrees one following the steps outlined here: http://johnr.hifizine.com/2014/09/ho...ibration-file/
. The only thing that's not needed is the last columns of zeros (phase data, not in the original calibration file and apparently not needed for REW). Also I did a few measurements for each position as I noticed that sometimes there is one measurement that is kind of astray. You don't want to use that one for either the A or M measurement.
As the 90 degrees vs 0 degrees mostly has an effect above 10KHz, I chose to position the Umik at about 1ft from the tweeter of my left front speaker, at exactly the same height as the tweeter centre (80 cm). That way the measurements were more consistent for the range above 10KHz. I had set the 3311 to direct to disable the sub and any audio processing.
Overall that was very easy, very straightforward and very efficient. I'm mainly posting this as it's a good way to generate this file for those who don't have it. As you can see it makes a BIG difference (up to 5dB) over 10KHz, and it's quite significant (up to 2-3 dB) between 1.5KHz and 5kHz.
That's the only graph I'm going to attach for now, as I'd rather save your collective wisdom and energy for when I get measurements with my X7200W, in a few weeks at most.
As the method linked above doesn't touch the calibration file below 1000Hz, I set the cursor there, so you can see the effect of the new calibration file over the default when the Umik is used at 90 degrees.
I used the same file names as in the linked article. A is the measurement with the default 0 degrees calibration file with the mike at 0 degrees, M is the measurement at 90 degrees with no calibration file (with the tip of the mike in exactly the same position as in A), and V is the verification measurement using the newly generated 90 degrees calibration file, exact same microphone position as in M.
Thanks again for all the help present in the guide, it really allows to hit the ground running. I'll post more as soon as the X7200W is here.