Change request: Calculation (and visualization) of seat-to-seat variation

[Jonas_h]

I would love for REW to calculate the seat-to-seat variance in a selected frequency interval. Both in terms of a single value and a visualization of the normalized variation. It would most likely be used for 10-80hz, but REW should allow for the full frequency spectrum and also take the smoothing into consideration. The new CEDIA RP22 requirements has thresholds for both bass and fullrange speakers which the above functionality could help measure.

Disclaimer: I am not sure how CEDIA or Harman calculates the single number. Is it max/min over the entire range or some kind of mean value over the range.

Harman use a normalized visualization of the seat-to-seat variation which would be a great way of doing it.

Trinnov has something like this where it maps the variation to a single number to compare to the RP22 requirements. REW doesn't need to show the levels, but at least it should calculate the value for the given frequency interval selected.

 

[John Mulcahy]

If you generate an average for the measurements and set the average as the SPL reference you will get a normalised view of variations.

I'll look into the variance figures, it could be shown as part of graph metrics.

 

[Jonas_h]

If you generate an average for the measurements and set the average as the SPL reference you will get a normalised view of variations.

View attachment 85309

I'll look into the variance figures, it could be shown as part of graph metrics.

Ah, very nice! Didnt know about this feature. Thank you.