It's been a couple years since I have used REW to take any measurements of my system, still using the same equipment. Today I upgraded to 5.19 beta 8 and am having a strange problem with the SPL graph. The response is looks very odd compared to my previous results. There's no way my subs are flat down below 10hz. When I look at the waterfall and RTA graph it looks normal like my previous measurements. I reviewed my settings and can't figure out what the problem is.
The pink is from a couple years ago and yellow is from today.
Here's the RTA measurement from today which looks like what I would expect.
The pink is from a couple years ago and yellow is from today.

Here's the RTA measurement from today which looks like what I would expect.
