This tutorial builds on the previous REW for MacOS - Taking Measurements video. However, as noted in that video, taking measurements is really the same in Windows or MacOS once you have REW up and running properly.
In this tutorial, I introduce the requirements for measurements that will be used for MSO, review some general guidelines, discuss how many measurements are required, and then show how to prepare to take the necessary measurements.
There are two follow on videos that cover measuring for sub-only MSO optimization and measuring for a subs+mains MSO optimization.
Sub Measurements: https://youtu.be/K7hNNmQzyy0
Subs+Mains Measurements: https://youtu.be/t6BwQDpcOzY