Exactly what I was talking about, see that narrow -50db down peak in the harmonic distortion graph at 1.8KHz.
That's approximately 0.01% distortion !!!
Just kidding : ) That is an exceptional performance @ 90db average output. Few of the NRC supplied reports on the SoundStageNetwork measurements page come close.
Just from past experience, I would personally be interested to hear the response from your engineering crew. Would an extra minute on the CNC machine contouring the rear midrange opening even be audible as the output increases above 95db?
Welcome to the Incremental Tweaker World, it never ends ... ever.
Thank you for the time and effort you spend in the Circle.