Subject: Soundproof room conundrum From: "Richard H." <auditory@xxxxxxxx> Date: Thu, 23 Aug 2007 14:49:11 +0100 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>This is a multi-part message in MIME format. ------=_NextPart_000_0115_01C7E594.C42C3320 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable The room I use for hearing tests has 14 inch thick walls and double = glazing. 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 glazing. 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!=20 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! ------=_NextPart_000_0115_01C7E594.C42C3320 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.6000.16525" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial>The room I use for hearing tests has 14 inch = thick walls=20 and double glazing.</FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial>I therefore don't use a booth.</FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial>I was finding that people with HF loss often = have VERY=20 sensitive hearing at LF, so they can detect trucks etc despite the = double=20 glazing.</FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial>I have now had the room QUADRUPLE glazed ... so = the=20 external LF sounds are greatly reduced.</FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial>However ... this seems to have given me a new=20 problem:</FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial>The room is now so quiet that WHEN external = sounds DO get=20 through (there are always some!) the person being tested is distracted = by them,=20 however faint!</FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial>I think I preferred the days when a steady = burble of=20 outside noise masked general activity around the building.</FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial>OK, the test results would be 10dB in error .. = but at=20 least the testing went smoothly! </FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial>My tests are now more accurcate .. but the = testees moan=20 about the smallest extraneous bump or click ... very = wearing!</FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial>It looks like I'll now need to buy a booth as = well ....=20 madness!</FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV></BODY></HTML> ------=_NextPart_000_0115_01C7E594.C42C3320--