This is also a really good test for binaural recording and replay!

Can you get the sound to be outside of your head when playing back the 
recording via external sound isolating earphones?
Does it help to rub your hand together when listening to the recording?
- Bo-Erik 

-----Original Message-----
From: Sursound [mailto:sursound-boun...@music.vt.edu] On Behalf Of Kees de 
Visser
Sent: den 26 november 2014 08:00
To: Surround Sound discussion group
Subject: [Sursound] Natural sound source to calibrate playback level

Dear list,

I'm looking for easy to use natural sound sources that can be used to calibrate 
a playback system, especially headphones and in-ear monitors, without the use 
of specialized equipment.
This website uses a neat trick, but I wonder if there are more precise ways:

http://www.audiocheck.net/testtones_hearingtestaudiogram.php

"rub your hands together, in front of your nose, quickly and firmly, and try 
producing the same sound as our calibration file. You are now generating a 
reference sound that is approximately 65 dBSPL. As you play back our 
calibration file, adjust your computer's volume to match the sound level you 
just heard from you hands. Proceed back and forth - preferably with your eyes 
closed, to increase concentration - until both levels match. Then, do not touch 
your computer's volume knob anymore. Calibration is done: your computer's 
volume knob has been set to match 65 dBSPL. This procedure should give us a 
confidence of approximately 10 dBHL in the next hearing test."

Thanks,
Kees de Visser

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