I am recently working a lot with REW (wonderful tool!) and use the EQ functionality a lot. I usually take multiple measurements and correct timing and SPL when necessary. I am not sure, what averaged measurements are the best to calculate proper EQ values in REW. db average is named as a candidate but has no phase information. As far as I know, REW can take phase information into account when computing the Filters (trying to produce minimum-phase filters). Following observations when trying to compute filters for L+R:
- when I use vector average between L and R, I basically get the same frequency response as an L+R measurement. IMHO, this provides a good basis to calculate filters with REW EQ
- when I use vector average for multiple measurements of one speaker, the frequency response drops in the highs. IMHO, this does not provide a good basis to calculate filters
Putting the information together, I assume that following workflow makes most sense when having multiple L and R measurements
- time align and SPL align all L measurements and then do a dB + phase avg. => result is an averaged L with phase information (L-dB)
- do the same for all R measurements => result is an averaged R with phase information (R-dB)
- do vector average with L-dB and R-dB => result is a "realistic" averaged L+R with phase information (L+R-VA)
- use L+R-VA to compute the filters
Is this correct? Did I miss something important? I did some research which left me confused, since different people use very different approaches (e.g. using only "Average the Responses" or only "Vector Average").