Here are a few common mistakes users make. Maybe by reading over them, you can avoid making the same mistakes:

1. forgetting to configure the rig to measure the desired speaker with the desired mic
2. forgetting to configure the PA so that only one speaker is producing sound for the measurement
3. forgetting to compute delay time prior to beginning the measurement process
4. forgetting to move the mic when taking the next measurement
5. forgetting to capture a measurement before moving onto the next measurement position