How many measurements and how close should they be

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I apoligize if this in a FAQ or something I did search, read tips and check help.

I'm only doing LF correction and it is Per speaker.

How many measurements (Mic positions) per speaker?

How physically close should each measurement to each other be?

How physically equal should the distance between the Mic and Speaker stay for each measurement?

I have a single couch in listening space. I was thinking of doing 3 measurements at ear height across the couch.

I plan to average these measurements together in REW and then build filters off that.

RPlusD believes the more the better. But I think if they are too far apart then things start to get very blury.

[Wayne A. Pflughaupt]

How many measurements (Mic positions) per speaker?
How physically close should each measurement to each other be?
How physically equal should the distance between the Mic and Speaker stay for each measurement?

I’d take a measurement from each listening location that you’re concerned about.

Regards,
Wayne