[SML] 125Hz room resonance

[mouse at fieldmousepro.com]

(Sorry, Tim. For some reason, the SML server seems to have left off the 
usual "reply to" address from your last message, so when I clicked 
"Reply" it only went to your address. I'll try re-sending it to the list 
here.)

Tim, that's interesting. I have heard of some frequencies "masking" 
other frequencies, particularly at various relative volume levels to 
each other. I believe the phenomenon is integrated into the MP3 data 
compression algorithm. It was discovered that some aspects of an audio 
signal could be thrown away because they're not perceptible underneath 
other aspects of the signal.

Looking at the circumstances you describe with a different focus, 
there's another possibility that might be worth considering: You might 
have the high frequency tone in your ears constantly but at a barely 
perceptible level, similar to a very light Tinnitus. However, you might 
only notice it while you're in an indoor space that's quiet and relaxing 
enough for it to not be masked by ambient environmental noise or the 
mental focus of work and activities.

The low frequencies of the indoor space might be coincidence, as they're 
also located in the indoor space, and you're concentrating on careful 
listening at that point.

I'll say this much: Sound can be a wacky combination of art, science, 
objective and subjective experiences. Even as a professional audio 
engineer, I know how often I can psych myself into hearing things. :) 
I'll plead the 5th on the number of times that I've carefully adjusted 
an EQ to my satisfaction, only to later realize that it was bypassed the 
whole time.

Stephen Lee

Tim Catlett wrote:

> I know that was the cause because the tinnitus would reduce when I 
> walked away from the room and went outside. It would also disappear 
> after a full day at work, only to reappear shortly after I returned 
> home.
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