Originally Posted by jtalden
Yes, I use HOLMImpulse
1- take a measurement at 6 mic positions
use meas location 11,12,13 for mic positions 1,2,3 (I name them 1,2,3 to keep track)
use meas location 16,17,18 for mic positions 4,5,6 (I name them 4,5,6 to keep track)
2- display in A,B,C: locations 11,12,13 and set options to raw, select Highest Positive Peak, then autoselect
3- confirm that the 3 impulse responses are all aligned with each other as shown below (important)
4- now Change C to L14 (location 14)
5- select manipulation, Sum C = A+B
6- change A to L13, B to L14, C to L15
7- select manipulation, Sum A+B=C
You now have the sum of 3 impulse responses in L15 like this:
[Now we repeat for the other 3 mic positions]
8- display in A,B,C: locations 16,17,18 and set options to raw, select Highest Positive Peak, then autoselect
9- confirm that the 3 impulse responses are all aligned with each other as shown below (important)
10- Change C to L19
11- select manipulation, Sum C = A+B
12- change A to L18, B to L19, C to L20
13- select manipulation, Sum A+B=C
[You now have the sum of all 3 impulse responses in L20]
14- change A to L15, B to L20, C to L2 (or anyplace you want)
15- confirm that the 2 impulse responses are aligned and you are still set to raw like this:
16- select manipulation, Sum C = A+B
You now have the summed impulse response saved in L2. You can now rename it and filter it as you like.
I believe this summed 6-pos impulse response provides the correct average amplitude and phase response except that it is increased in amplitude by approximately 15.563 dB [20*LOG(6)]. You can just scale down again if you like, but I see no reason as the amplitude scale is arbitrary to start with.
This process sounds long and complicated and it goes slowly at first. With some practice it goes quickly. I complete a 6 measurement average in maybe 3-5 minutes so it’s not really so bad. I use HOLM as it carries along the phase response. REW is a little easier to use but just provides amplitude response.
I did this “guide” quickly and mostly off the top of my head. There are many little details to watch and I may have forgotten to mention one or two. Let me know if you have questions.