Magnus, the reason I ask about separate measurements, particularly in a surround system, is because for my 2.2 system, I use the Audyssey Multi XT32 software built into my Marantz prepro. It runs a frequency sweep for each speaker from eight positions to calculate the average filters for each speaker. I can’t use that for my 5.2 surround because my multichannel DAC, a miniDSP, is analog out and the Marantz won’t apply Audyssey filtering to its multichannel analog input.
The other thing that REW alone can’t do, to my knowledge, is provide any bass management. As many of you know, SACD/DSF tracks are full range to all speakers in a surround format. My surround and center channels are smaller speakers and I don’t want the bass routed to them. In my setup, I am using my old fashioned Outlaw Audio ICBM-1 analog bass management device to route all bass from the front, center and surround speakers to the subs. It would be that bass managed output from the ICBM-1 that I would run REW on, although it seems strange to have all 7 speakers measured as one single speaker. But I guess you are suggesting that it can work pretty well that way.
Now, if anyone knows how I could export the Audyssey measurements in the Marantz and put them into Roon, that would be ideal. (Anybody?). Thanks. JCR