I want to measure the sound spectrum of a hair dryer. So I did two RTA measurement: With (A) and without (B) switching on the hair dryer.
And then in the "All SPL" graph I do the (A) minus (B) and generated the third graph. I hope this more or less represent the spectrum of the hair dryer. However I got a very weird graph. Please see the attached saved measurement.
Why there seems nothing at the higher frequency part in the A-B graph?
Thank you very much.
And then in the "All SPL" graph I do the (A) minus (B) and generated the third graph. I hope this more or less represent the spectrum of the hair dryer. However I got a very weird graph. Please see the attached saved measurement.
Why there seems nothing at the higher frequency part in the A-B graph?
Thank you very much.