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'professional auditorium'
It sounds as if you plan on measuring these things "in air". While it is useful to measure real world results, this method will raise the bar on the method of measurement involved.
It would seem that to achieve any meaningful numbers you would need to perform the test in an Anechoic chamber rather than an auditorium to avoid echo creating phase problems misleading your measurements. The choice of a laboratory grade speakers and microphones is a greater can of worms. Microphones and Speakers exhibit more variation than tube amps vs. solid state ever would. Then there is speaker loading difference between tube and solid state making direct amp output measurements about as difficult as mic and speaker readings.
I sincerely will you good luck with the details of project
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