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Re: Soundproof room conundrum

Is the LF actually structure-bourne?

Dr. Peter Lennox
Signal Processing Applications Research Group
University of Derby
Int. tel: 3155

>>> "Richard H." <auditory@xxxxxxxxxxxxxx> 23/08/2007 14:49 >>>
The room I use for hearing tests has 14 inch thick walls and double

I therefore don't use a booth.

I was finding that people with HF loss often have VERY sensitive
hearing at LF, so they can detect trucks etc despite the double

I have now had the room QUADRUPLE glazed ... so the external LF sounds
are greatly reduced.

However ... this seems to have given me a new problem:

The room is now so quiet that WHEN external sounds DO get through
(there are always some!) the person being tested is distracted by them,
however faint!

I think I preferred the days when a steady burble of outside noise
masked general activity around the building.

OK, the test results would be 10dB in error .. but at least the testing
went smoothly! 

My tests are now more accurcate .. but the testees moan about the
smallest extraneous bump or click ... very wearing!

It looks like I'll now need to buy a booth as well .... madness!

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