Multi-Sub Optimizer Reference Manual (page 28)

Multi-Sub Optimizer FAQ

So far, this FAQ only contains one question, but it's by far the most commonly asked one, and the number of possible answers is quite large. Unfortunately, the problem of mismatch between MSO's calculated results and the final measured results is one that's very difficult to solve in a forum Q&A setting. To accurately and efficiently track the problem down would require being physically present during the whole process.

Why Doesn't My Final Measured Data Agree With MSO's Predictions?

This problem is usually measurement-related. If you're not getting reliable measurements, MSO's calculated results will not correspond to final measured results either. If this is indeed the case, then the problem of getting unreliable REW measurements needs to be solved.

See this post for the kind of accuracy (calculated vs. measured) that can be achieved.

A Suggested Technique for Verifying MSO Predictions

Before delving into the details of the potential causes of verification errors, it's worth mentioning one technique for measurement and verification that has worked well for many users:

A List of Possible Causes of Prediction/Measurement Mismatch

Below is a list of some causes of the mismatch between MSO predictions and final measurement that have been identified by MSO users.

This FAQ will be updated from time to time as more possibilities come to mind and more user experience is incorporated.