double-wall sound proof booth attenuation (LAVANDIER mathieu )


Subject: double-wall sound proof booth attenuation
From:    LAVANDIER mathieu  <Mathieu.LAVANDIER@xxxxxxxx>
Date:    Fri, 5 Mar 2010 17:44:07 +0100
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

--_000_B8E3DB6B7A954841A17F9862131BF46761BE762464simel01entpen_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear list, Would anyone have measured the attenuation characteristics of a double-wall= sound proof booth once the booth is installed on site, compared to the cha= racteristics announced by the manufacturer? I'm having a booth built, and after several installation attempts (by the m= anufacturer), I still don't get what was announced. Basically, they announ= ce an attenuation over 90 dB above 1 kHz (which is huge), I'm getting 70 dB= (which is quite good, but still 20 dB less than what I'm paying for...), a= nd the manufacturer says: "that's fine, that's what we normally get for mea= surement on site". The reference measurement giving over 90 dB is supposed to be done in a rev= erberant room (so, same sound level all around the booth during the measure= ment). The room where my booth is installed might not be as reverberant; bu= t I'm doing the measurement with the microphone between the sound source an= d the booth, so on the worse side of the booth. So I anticipate that, if my= room was perfectly reverberant, I would get equal or smaller performances.= .. I would like to know if I'm getting what others are getting or if I should = keep on complaining. Actually, very soon the manufacturer will not have any= proposition for improvement (they told me already) so I have to decide if = I keep the booth, or if they take it away and I'm looking for somebody else= to build me a better one... (I haven't tell the manufacturer name, but it = might be difficult to find a better known company in the field...) Thanks in advance for your advice, Mat ---------------------------------------------------------------------------= -------------------- Mathieu Lavandier Universit=E9 de Lyon, Ecole Nationale des Travaux Publics de l'Etat (ENTPE) D=E9partement G=E9nie Civil et B=E2timent (DGCB), Unit=E9 CNRS 1652 Rue M. Audin, 69518 Vaulx-en-Velin Cedex, FRANCE T=E9l : +33 (0)4 72 04 70 30 Fax : +33 (0)4 72 04 70 41 --_000_B8E3DB6B7A954841A17F9862131BF46761BE762464simel01entpen_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <html xmlns:v=3D"urn:schemas-microsoft-com:vml" xmlns:o=3D"urn:schemas-micr= osoft-com:office:office" xmlns:w=3D"urn:schemas-microsoft-com:office:word" = xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" xmlns=3D"http:= //www.w3.org/TR/REC-html40"> <head> <meta http-equiv=3DContent-Type content=3D"text/html; charset=3Diso-8859-1"= > <meta name=3DGenerator content=3D"Microsoft Word 12 (filtered medium)"> <style> <!-- /* Font Definitions */ @xxxxxxxx {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4;} @xxxxxxxx {font-family:Consolas; panose-1:2 11 6 9 2 2 4 3 2 4;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {margin:0cm; margin-bottom:.0001pt; font-size:11.0pt; font-family:"Calibri","sans-serif";} a:link, span.MsoHyperlink {mso-style-priority:99; color:blue; text-decoration:underline;} a:visited, span.MsoHyperlinkFollowed {mso-style-priority:99; color:purple; text-decoration:underline;} p.MsoPlainText, li.MsoPlainText, div.MsoPlainText {mso-style-priority:99; mso-style-link:"Texte brut Car"; margin:0cm; margin-bottom:.0001pt; font-size:10.5pt; font-family:Consolas;} span.EmailStyle17 {mso-style-type:personal-compose; font-family:"Calibri","sans-serif"; color:windowtext;} span.TextebrutCar {mso-style-name:"Texte brut Car"; mso-style-priority:99; mso-style-link:"Texte brut"; font-family:Consolas;} .MsoChpDefault {mso-style-type:export-only;} @xxxxxxxx Section1 {size:612.0pt 792.0pt; margin:70.85pt 70.85pt 70.85pt 70.85pt;} div.Section1 {page:Section1;} --> </style> <!--[if gte mso 9]><xml> <o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" /> </xml><![endif]--><!--[if gte mso 9]><xml> <o:shapelayout v:ext=3D"edit"> <o:idmap v:ext=3D"edit" data=3D"1" /> </o:shapelayout></xml><![endif]--> </head> <body lang=3DFR link=3Dblue vlink=3Dpurple> <div class=3DSection1> <p class=3DMsoNormal>Dear list,<o:p></o:p></p> <p class=3DMsoNormal><o:p>&nbsp;</o:p></p> <p class=3DMsoNormal><span lang=3DEN-US>Would anyone have measured the atte= nuation characteristics of a double-wall sound proof booth once the booth is instal= led on site, compared to the characteristics announced by the manufacturer?<o:p= ></o:p></span></p> <p class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p> <p class=3DMsoNormal><span lang=3DEN-US>I&#8217;m having a booth built, and= after several installation attempts (by the manufacturer), I still don&#8217;t ge= t what was announced. =A0Basically, they announce an attenuation over 90 dB a= bove 1 kHz (which is huge), I'm getting 70 dB (which is quite good, but still 20 d= B less than what I&#8217;m paying for&#8230;), and the manufacturer says: &quot;that's fine, that's what we normally get for measurement on site&quot= ;.<o:p></o:p></span></p> <p class=3DMsoNormal><span lang=3DEN-US>The reference measurement giving ov= er 90 dB is supposed to be done in a reverberant room (so, same sound level all arou= nd the booth during the measurement). The room where my booth is installed mig= ht not be as reverberant; but I&#8217;m doing the measurement with the microph= one between the sound source and the booth, so on the worse side of the booth. = So I anticipate that, if my room was perfectly reverberant, I would get equal or= smaller performances&#8230;<o:p></o:p></span></p> <p class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p> <p class=3DMsoNormal><span lang=3DEN-US>I would like to know if I'm getting= what others are getting or if I should keep on complaining. Actually, very soon the manufacturer will not have any proposition for improvement (they told me already) so I have to decide if I keep the booth, or if they take it away a= nd I'm looking for somebody else to build me a better one&#8230; (I haven&#821= 7;t tell the manufacturer name, but it might be difficult to find a better know= n company in the field&#8230;)<o:p></o:p></span></p> <p class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p> <p class=3DMsoNormal><span lang=3DEN-US>Thanks in advance for your advice,<= o:p></o:p></span></p> <p class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p> <p class=3DMsoNormal><span lang=3DEN-US>Mat<o:p></o:p></span></p> <p class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p> <p class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p> <p class=3DMsoNormal><span lang=3DEN-US style=3D'font-size:10.0pt;font-fami= ly:"Times New Roman","serif"'>&nbsp;<o:p></o:p></span></p> <p class=3DMsoNormal><span lang=3DEN-US style=3D'font-size:10.0pt;font-fami= ly:"Times New Roman","serif"'>&nbsp;<o:p></o:p></span></p> <p class=3DMsoNormal><span lang=3DEN-US style=3D'font-size:10.0pt;font-fami= ly:"Times New Roman","serif"'>&nbsp;<o:p></o:p></span></p> <p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Times New= Roman","serif"'>----------------------------------------------------------= -------------------------------------<o:p></o:p></span></p> <p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Times New= Roman","serif"'>Mathieu Lavandier<br> Universit=E9 de Lyon, Ecole Nationale des Travaux Publics de l'Etat (ENTPE)= <br> D=E9partement G=E9nie Civil et B=E2timent (DGCB), Unit=E9 CNRS 1652<o:p></o= :p></span></p> <p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Times New= Roman","serif"'>Rue M. Audin, 69518 Vaulx-en-Velin Cedex, FRANCE<br> T=E9l : +33 (0)4 72 04&nbsp;70 30<br> Fax : +33 (0)4 72 04 70 41<o:p></o:p></span></p> <p class=3DMsoNormal><o:p>&nbsp;</o:p></p> </div> </body> </html> --_000_B8E3DB6B7A954841A17F9862131BF46761BE762464simel01entpen_--


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