Measuring Response: How close is "close enough" to anechoic?

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Joined 2005
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Just a followup to this ; I’m late to this party.

I’m aware you ended up acquiring the NFS.

Does your data, which I understand is for review purposes (ie. you want to make relatively fast and consistent measurements to be able to compare products fairly), now match data from other NFS owners?

Or, if you tear the test rig down, and set it up again in another time/space, are the measurements exactly the same (within <0.5dB)

Or, is that you are experiencing, whether it is indoor GP, outdoor GP, NF + FF part of the Observer Effect?