vintage Bruel & Kjaer protractor SC 2361
Bruel & Kjaer protractor
SC 2361 protractor for determination of reverberation time from decay curves recorded on level recorder type 2305 or 2307.
more info at
pag 31 on,
http://www.cieri.net/Documenti/Misure%20audio/Bruel%20&%20Kjaer%20-%20Electro%20Acoustic%20Measurements%20(AN16-035).pdf
(once opend search 2361 or Ctrf + F and 2361)
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