Originally Posted by IgorZep
Originally Posted by mogorf
Hi Max, all's well in my neck of the woods. Thanks.
As regards the graph I think you are right, it did look pretty smooth for me as well even after setting 1/24 smoothing. Each of the graphs were averaged in REW after taking 6 independent in-room measurements in a style we place the Audyssey mic during setup. Could it be that an averaged graph looks quite smooth even at 1/24 smoothing while a single point measurement will show up like in your example?
Yes, the average is much more smooth than individual measurements.
Nope, that's incorrect.
Feri, even with averaged graphs, what matters is the individual graphs' smoothing settings before averaging. You can quickly try this on your own:
If you take 6 graphs, set each graph to 1/3 smoothing, then average them all to produce Avg1
Take the same 6 graphs, individually set them to 1/24 smoothing, then average them all to produce Avg2.
Avg1 will be much smoother than Avg2. You will also discover that when you save the mdat of the averaged graphs (I took a look at your mdat zip file), you can, at a later time change the smoothing to a lower resolution (i.e. switching the smoothing of Avg2 from the original 1/24 to 1/3 smoothing makes it look similar to Avg1 with its 1/3 smoothing), but you now cannot increase the resolution (I.e. switching Avg1 from the original 1/3 to 1/24 smoothing still looks like 1/3 smoothing).
REW is incredibly powerful in how you can manipulate what you want to see from measurements (so you can analyze the results), eg. what range you want to focus on, and how much resolution you want, but you need to be careful to set it properly.
As with Jason's example of always measuring full range because you can always zoom in on the bass region later if you want to, whereas if you set REW to ONLY measure the bass frequencies, you won't be able to use that measurement later to see the full range result.
Likewise, when averaging measurements, if you start by setting each individual measurement to No Smoothing, the averaged result will have maximum resolution, which you can later decrease if you want to view the full range averaged measurement at 1/3 or 1/6 smoothing for example. But if you want to focus on the bass, you can zoom in on the 5-300Hz range of this same averaged measurement and set it to No Smoothing for maximum resolution/detail.
If however, you created the averaged measurement from individual measurements with smoothing already applied, you won't be able to see the maximum resolution (No Smoothing) at a later time, unless you take all the individual measurements again and average them again AFTER individually setting them to No Smoothing.
MaxEdited by djbluemax1 - 1/12/13 at 2:15am