It is getting colder with the measurement room temp at 14 degrees C. Reference axis was the center of the tweeter (aligned by eye). Likewise listening tests are performed per research that shows mono listening is much more revealing of differences between speakers than stereo or multichannel. Measurements are compliant with latest speaker research into what can predict the speaker preference and is standardized in CEA/CTA-2034 ANSI specifications. In a nutshell, the measurements show the actual sound coming out of the speaker independent of the room.
Both of these factors enable testing in ordinary rooms yet results that can be more accurate than an anechoic chamber. It also measures the speaker at close distance ("near-field") which sharply reduces the impact of room noise. This is a robotic measurement system that analyzes the speaker all around and is able (using advanced mathematics and dual scan) to subtract room reflections (so where I measure it doesn't matter). Measurements that you are about to see were performed using the Klippel Near-field Scanner (NFS). In testing it really plugged the port unlike foam ones which half of the time feel like they are not doing anything. I put in the very well designed dense foam plug that fits the port exceptionally well.
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