[AUDITORY] SAT, and Question about Sound Pressure Levels (Kevin Austin )


Subject: [AUDITORY] SAT, and Question about Sound Pressure Levels
From:    Kevin Austin  <kevin.austin@xxxxxxxx>
Date:    Thu, 7 Nov 2013 17:56:20 -0500
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

--Boundary_(ID_rFj/DYUlYkTiCk7SRhciMg) Content-type: text/plain; charset=windows-1252 Content-transfer-encoding: quoted-printable Thank you for the prompt response. 105 dB !!?? I will from now on strongly advise AGAINST people attending events at = SAT http://sat.qc.ca until such time as it is clear that the = production team at SAT understands the damaging effects to hearing of = the sound pressure levels that seem to be found as =93acceptable=94. These are the figures from the Center for Disease Control: http://www.cdc.gov/healthyyouth/noise/signs.htm Potentially Hazardous Sound Level Sound Source Examples Sound Intensity (Decibels) Recommended = Exposure Limits For Repeated Exposures* Comments School cafeteria 85 8 hours Prolonged exposures might cause = slight hearing loss. Hearing protection should be used if regularly = exposed to this sound level beyond the exposure limit.=87 Band class 90 2 hours Hearing protection should be used if = regularly exposed to this sound level beyond the exposure limit.=87 Wood or metal shop, power tools, snowmobile 100 15 minutes = Hearing protection should be used if exposed to this sound level beyond = the exposure limit.=87 Hazardous Sound Level Sound Source Examples Sound Intensity (Decibels) Recommended = Exposure Limits For Repeated Exposures* Comments Personal stereo system at high volume 105 5 minutes Hearing = protection should be used if exposed to this sound level beyond the = exposure limit.=87 Might I strongly suggest that the production team at SAT review the = procedures for assuring the public that sound pressure levels, DO NOT, = reach or exceed 90dB. >> Thanks for your time >>=20 >> Kevin Austin >> Professor, Electroacoustic Studies >> Department of Music >> Faculty of Fine Arts >> Concordia University >>=20 On 2013, Nov 7, at 11:35 AM, Auche Alexandre SAT <aauche@xxxxxxxx> = wrote: > Hello Mr Austin > Our venue is taking care of the sound level and we are never up to 105 = DBA at the sound board. We don't want to hurt our clients. We have a = multi-diffusion PA system that allows us to have a good sound all over = the room without pushing the front PA at a high level. We are probably = one of the only venue like this in Montreal, close to European norms. > Thanks > Alexandre Auch=E9 >=20 > Le 2013-11-06 =E0 21:37, Kevin Austin a =E9crit : >=20 >>=20 >> Monique Savoie >> Pr=E9sidente - Fondatrice & Directrice artistique >> SOCI=C9T=C9 DES ARTS TECHNOLOGIQUES [SAT] >> Montreal, QC >>=20 >>=20 >> Hi >>=20 >> Some students in my classes have told me that the sound pressure = levels of SAT shows may be dangerously high and that people should wear = good earplugs to avoid hearing damage. >>=20 >> Could you let me know how you monitor sound pressure levels, and what = are the peak and RMS values at shows. >>=20 >>=20 >> Thanks for your time >>=20 >> Kevin Austin >> Professor, Electroacoustic Studies >> Department of Music >> Faculty of Fine Arts >> Concordia University >>=20 >>=20 >>=20 >>=20 >> CC: electroacoustics@xxxxxxxx >>=20 >> Alexandre Auch=E9 >> G=E9rant Espace SAT >>=20 >> J=E9r=F4me Arsenault >> Directeur technique, SAT[Espace] >=20 > ALEXANDRE AUCH=C9 > G=C9RANT SAT & LABO CULINAIRE/FOODLAB - R=C9SERVATIONS SALLES=20 > SAT & LABO CULINAIRE/FOODLAB MANAGER - VENUE BOOKING > SAT.QC.CA > SOCI=C9T=C9 DES ARTS TECHNOLOGIQUES [SAT] --Boundary_(ID_rFj/DYUlYkTiCk7SRhciMg) Content-type: text/html; charset=windows-1252 Content-transfer-encoding: quoted-printable <html><head><meta http-equiv=3D"Content-Type" content=3D"text/html = charset=3Dwindows-1252"></head><body style=3D"word-wrap: break-word; = -webkit-nbsp-mode: space; -webkit-line-break: = after-white-space;"><div><br></div><div>Thank you for the prompt = response.</div><div><br></div><div>105 dB = !!??</div><div><br></div><div>I will from now on strongly advise AGAINST = people attending events at SAT &nbsp;<a = href=3D"http://sat.qc.ca">http://sat.qc.ca</a> &nbsp;until such time as = it is clear that the production team at SAT understands the damaging = effects to hearing of the sound pressure levels that seem to be found as = =93acceptable=94.</div><div><br></div><div><br></div><div>These are the = figures from the Center for Disease Control:</div><div><a = href=3D"http://www.cdc.gov/healthyyouth/noise/signs.htm">http://www.cdc.go= v/healthyyouth/noise/signs.htm</a></div><div><br></div><div><table = border=3D"0" cellpadding=3D"0" cellspacing=3D"0" style=3D"margin: 1rem = auto 0px; padding: 2.5px; box-sizing: border-box; border: 1px solid = rgb(0, 0, 0); border-collapse: collapse; word-wrap: break-word; = table-layout: auto; color: rgb(0, 0, 0); font-family: Verdana, Arial, = Helvetica, sans-serif; font-size: 12.152777671813965px; = background-color: rgb(255, 255, 255); position: static; z-index: = auto;"><tbody style=3D"margin: 0px; padding: 0px;"><tr style=3D"margin: = 0px; padding: 0px;"><th scope=3D"col" colspan=3D"4" bgcolor=3D"#FF9900" = style=3D"margin: 0px; padding: 2.5px; border: 1px solid rgb(0, 0, 0); = text-align: center; background-color: rgb(243, 242, 249);"><strong = style=3D"margin: 0px; padding: 0px;"><font size=3D"4">Potentially = Hazardous Sound Level</font></strong></th></tr><tr style=3D"margin: 0px; = padding: 0px;"><th scope=3D"col" width=3D"30%" class=3D"psmall" = style=3D"margin: 0px; padding: 2.5px; border: 1px solid rgb(0, 0, 0); = text-align: center; font-weight: normal; background-color: rgb(243, 242, = 249);"><b style=3D"margin: 0px; padding: 0px;"><font size=3D"4">Sound = Source Examples</font></b></th><th scope=3D"col" class=3D"psmall" = width=3D"11%" style=3D"margin: 0px; padding: 2.5px; border: 1px solid = rgb(0, 0, 0); text-align: center; font-weight: normal; background-color: = rgb(243, 242, 249);"><b style=3D"margin: 0px; padding: 0px;"><font = size=3D"4">Sound Intensity (Decibels)</font></b></th><th scope=3D"col" = class=3D"psmall" width=3D"17%" style=3D"margin: 0px; padding: 2.5px; = border: 1px solid rgb(0, 0, 0); text-align: center; font-weight: normal; = background-color: rgb(243, 242, 249);"><b style=3D"margin: 0px; padding: = 0px;"><font size=3D"4">Recommended Exposure Limits For Repeated = Exposures*</font></b></th><th scope=3D"col" class=3D"psmall" width=3D"35%"= style=3D"margin: 0px; padding: 2.5px; border: 1px solid rgb(0, 0, 0); = text-align: center; font-weight: normal; background-color: rgb(243, 242, = 249);"><b style=3D"margin: 0px; padding: 0px;"><font = size=3D"4">Comments</font></b></th></tr><tr style=3D"margin: 0px; = padding: 0px;"><td scope=3D"row" align=3D"left" width=3D"30%" = class=3D"psmall" bgcolor=3D"#FFFFFF" style=3D"margin: 0px; padding: = 2.5px; border: 1px solid rgb(0, 0, 0);"><font size=3D"4">School = cafeteria</font></td><td align=3D"center" width=3D"11%" class=3D"psmall" = bgcolor=3D"#FFFFFF" style=3D"margin: 0px; padding: 2.5px; border: 1px = solid rgb(0, 0, 0);"><font size=3D"4">85</font></td><td align=3D"center" = width=3D"17%" class=3D"psmall" bgcolor=3D"#FFFFFF" style=3D"margin: 0px; = padding: 2.5px; border: 1px solid rgb(0, 0, 0);"><font size=3D"4">8 = hours</font></td><td width=3D"35%" class=3D"psmall" bgcolor=3D"#FFFFFF" = style=3D"margin: 0px; padding: 2.5px; border: 1px solid rgb(0, 0, = 0);"><font size=3D"4">Prolonged exposures might cause slight hearing = loss. Hearing protection should be used if regularly exposed to this = sound level beyond the exposure limit.=87</font></td></tr><tr = style=3D"margin: 0px; padding: 0px;"><td scope=3D"row" align=3D"left" = width=3D"30%" class=3D"psmall" bgcolor=3D"#FFFFFF" style=3D"margin: 0px; = padding: 2.5px; border: 1px solid rgb(0, 0, 0);"><font size=3D"4">Band = class</font></td><td align=3D"center" width=3D"11%" class=3D"psmall" = bgcolor=3D"#FFFFFF" style=3D"margin: 0px; padding: 2.5px; border: 1px = solid rgb(0, 0, 0);"><font size=3D"4">90</font></td><td align=3D"center" = width=3D"17%" class=3D"psmall" bgcolor=3D"#FFFFFF" style=3D"margin: 0px; = padding: 2.5px; border: 1px solid rgb(0, 0, 0);"><font size=3D"4">2 = hours</font></td><td width=3D"35%" class=3D"psmall" bgcolor=3D"#FFFFFF" = style=3D"margin: 0px; padding: 2.5px; border: 1px solid rgb(0, 0, = 0);"><font size=3D"4">Hearing protection should be used if regularly = exposed to this sound level beyond the exposure = limit.=87</font></td></tr><tr style=3D"margin: 0px; padding: 0px;"><td = scope=3D"row" align=3D"left" width=3D"30%" class=3D"psmall" = bgcolor=3D"#FFFFFF" style=3D"margin: 0px; padding: 2.5px; border: 1px = solid rgb(0, 0, 0);"><font size=3D"4">Wood or metal shop, power tools, = snowmobile</font></td><td align=3D"center" width=3D"11%" class=3D"psmall" = bgcolor=3D"#FFFFFF" style=3D"margin: 0px; padding: 2.5px; border: 1px = solid rgb(0, 0, 0);"><font size=3D"4">100</font></td><td align=3D"center" = width=3D"17%" class=3D"psmall" bgcolor=3D"#FFFFFF" style=3D"margin: 0px; = padding: 2.5px; border: 1px solid rgb(0, 0, 0);"><font size=3D"4">15 = minutes</font></td><td width=3D"35%" class=3D"psmall" bgcolor=3D"#FFFFFF" = style=3D"margin: 0px; padding: 2.5px; border: 1px solid rgb(0, 0, = 0);"><font size=3D"4">Hearing protection should be used if exposed to = this sound level beyond the exposure limit.=87</font></td></tr><tr = style=3D"margin: 0px; padding: 0px;"><th scope=3D"col" colspan=3D"4" = bgcolor=3D"#FF0000" style=3D"margin: 0px; padding: 2.5px; border: 1px = solid rgb(0, 0, 0); text-align: center; background-color: rgb(243, 242, = 249);"><strong style=3D"margin: 0px; padding: 0px;"><font = size=3D"4">Hazardous Sound Level</font></strong></th></tr><tr = style=3D"margin: 0px; padding: 0px;"><th scope=3D"col" width=3D"30%" = class=3D"psmall" style=3D"margin: 0px; padding: 2.5px; border: 1px solid = rgb(0, 0, 0); text-align: center; font-weight: normal; background-color: = rgb(243, 242, 249);"><b style=3D"margin: 0px; padding: 0px;"><font = size=3D"4">Sound Source Examples</font></b></th><th scope=3D"col" = class=3D"psmall" width=3D"11%" style=3D"margin: 0px; padding: 2.5px; = border: 1px solid rgb(0, 0, 0); text-align: center; font-weight: normal; = background-color: rgb(243, 242, 249);"><b style=3D"margin: 0px; padding: = 0px;"><font size=3D"4">Sound Intensity (Decibels)</font></b></th><th = scope=3D"col" class=3D"psmall" width=3D"17%" style=3D"margin: 0px; = padding: 2.5px; border: 1px solid rgb(0, 0, 0); text-align: center; = font-weight: normal; background-color: rgb(243, 242, 249);"><b = style=3D"margin: 0px; padding: 0px;"><font size=3D"4">Recommended = Exposure Limits For Repeated Exposures*</font></b></th><th scope=3D"col" = class=3D"psmall" width=3D"35%" style=3D"margin: 0px; padding: 2.5px; = border: 1px solid rgb(0, 0, 0); text-align: center; font-weight: normal; = background-color: rgb(243, 242, 249);"><b style=3D"margin: 0px; padding: = 0px;"><font size=3D"4">Comments</font></b></th></tr><tr style=3D"margin: = 0px; padding: 0px;"><td scope=3D"row" align=3D"left" width=3D"30%" = class=3D"psmall" bgcolor=3D"#FFFFFF" style=3D"margin: 0px; padding: = 2.5px; border: 1px solid rgb(0, 0, 0);"><font size=3D"4">Personal stereo = system at high volume</font></td><td align=3D"center" width=3D"11%" = class=3D"psmall" bgcolor=3D"#FFFFFF" style=3D"margin: 0px; padding: = 2.5px; border: 1px solid rgb(0, 0, 0);"><font = size=3D"4">105</font></td><td align=3D"center" width=3D"17%" = class=3D"psmall" bgcolor=3D"#FFFFFF" style=3D"margin: 0px; padding: = 2.5px; border: 1px solid rgb(0, 0, 0);"><font size=3D"4">5 = minutes</font></td><td width=3D"35%" class=3D"psmall" bgcolor=3D"#FFFFFF" = style=3D"margin: 0px; padding: 2.5px; border: 1px solid rgb(0, 0, = 0);"><font size=3D"4">Hearing protection should be used if exposed to = this sound level beyond the exposure = limit.=87</font></td></tr></tbody></table><div><br></div></div><div><br></= div><div>Might I strongly suggest that the production team at SAT review = the procedures for assuring the public that sound pressure levels, DO = NOT, reach or exceed 90dB.</div><div><br></div><div><blockquote = type=3D"cite"><div style=3D"word-wrap: break-word; -webkit-nbsp-mode: = space; -webkit-line-break: after-white-space;"><blockquote = type=3D"cite">Thanks for your time<br><br>Kevin Austin<br>Professor, = Electroacoustic Studies<br>Department of Music<br>Faculty of Fine = Arts<br>Concordia = University<br><br></blockquote></div></blockquote></div><div><br></div><di= v><br></div><div><br></div><div><br></div><div><br></div><br><div><div>On = 2013, Nov 7, at 11:35 AM, Auche Alexandre SAT &lt;<a = href=3D"mailto:aauche@xxxxxxxx">aauche@xxxxxxxx</a>&gt; = wrote:</div><br class=3D"Apple-interchange-newline"><blockquote = type=3D"cite"><div style=3D"word-wrap: break-word; -webkit-nbsp-mode: = space; -webkit-line-break: after-white-space; ">Hello Mr Austin<div>Our = venue is taking care of the sound level and we are never up to 105 DBA = at the sound board. We don't want to hurt our clients. We have a = multi-diffusion PA system that allows us to have a good sound all over = the room without pushing the front PA at a high level. We are probably = one of the only venue like this in Montreal, close to European = norms.</div><div>Thanks</div><div>Alexandre = Auch=E9</div><div><br><div><div>Le 2013-11-06 =E0 21:37, Kevin Austin a = =E9crit :</div><br class=3D"Apple-interchange-newline"><blockquote = type=3D"cite"><br>Monique Savoie<br>Pr=E9sidente - Fondatrice &amp; = Directrice artistique<br>SOCI=C9T=C9 DES ARTS TECHNOLOGIQUES = [SAT]<br>Montreal, QC<br><br><br>Hi<br><br>Some students in my classes = have told me that the sound pressure levels of SAT shows may be = dangerously high and that people should wear good earplugs to avoid = hearing damage.<br><br>Could you let me know how you monitor sound = pressure levels, and what are the peak and RMS values at = shows.<br><br><br>Thanks for your time<br><br>Kevin Austin<br>Professor, = Electroacoustic Studies<br>Department of Music<br>Faculty of Fine = Arts<br>Concordia University<br><br><br><br><br>CC: <a = href=3D"mailto:electroacoustics@xxxxxxxx">electroacoustics@xxxxxxxx= a</a><br><br>Alexandre Auch=E9<br>G=E9rant Espace SAT<br><br>J=E9r=F4me = Arsenault<br>Directeur technique, = SAT[Espace]</blockquote></div><br><div> <meta http-equiv=3D"content-type" content=3D"text/html; = charset=3DUTF-8"> <title>Signature</title> =20 =20 =20 <table = style=3D"font-family:arial;font-size:11px;color:#333333;border:1px solid = #dddddd;border-left:none;border-right:none;" border=3D"0" = cellpadding=3D"2" cellspacing=3D"0" width=3D"100%"> <tbody> <tr> <td = style=3D"font-weight:bold;font-size:14px;padding-top:12px;color:#dc2620;">= ALEXANDRE AUCH=C9</td> </tr> <tr> <td style=3D"font-weight:bold;"> G=C9RANT SAT &amp; LABO CULINAIRE/FOODLAB - R=C9SERVATIONS = SALLES <br> SAT &amp; LABO CULINAIRE/FOODLAB MANAGER - VENUE BOOKING </td> </tr> <tr> <td> <a href=3D"http://sat.qc.ca/" = style=3D"color:#333333;vertical-align:top;">SAT.QC.CA</a></td> </tr> <tr> <td = style=3D"color:#888;font-size:11px;padding-bottom:15px;padding-top:4px;"> SOCI=C9T=C9 DES ARTS TECHNOLOGIQUES [SAT]</td> </tr> </tbody> </table> =20 =20 </div> <br></div></div></blockquote></div><br></body></html>= --Boundary_(ID_rFj/DYUlYkTiCk7SRhciMg)--


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