loud sounds again (Neil Todd )

Subject: loud sounds again
From:    Neil Todd  <TODD(at)FS4.PSY.MAN.AC.UK>
Date:    Wed, 24 Feb 1999 16:50:32 GMT

Dear List Thanks for all replies to my request, for your interest attached below. Armed with my B&K 2260 Investigator this intrepid explorer set out to sample some of Manchester's sounds. To my surprise most venues have been extremely helpful and willing for me to take measurements. It seems that I can get into just about any place free of charge. Damm good thing that I took some precautions though, as recommened. For example, in one venue which had PA with a power rating of a mean 20,000 W(!), I measured on one occasion an LAeq (equivalent continuous level, A-weighting) of 111 dB. The peak of power was at 400 Hz (1/3 octave) 126 dB A weighting, fast response. (This would be about 130 dB on the C weighting). At 111 dB OSHA gives the maximum allowable exposure per 8 hour day at at 26 minutes. ISO recommend 3.25 minutes maximum allowable exposure per 40 hour week! The predominance of low frequencies, 500 Hz and less, apparently the source of pleasure that loud dance music provides via vibrotactile and other non-auditory sensations, is consistent with damage to low frequency hearing (as well as high frequencies) that I have been finding in a survey of undergraduate students who frequent dance clubs. E.g. in 10 subjects I looked at so far I found the mean loss at 250 was about 12 dB compared with 4 dB at 2 kHz. Cheers Neil *********************************** Dr Neil Todd Lecturer in Psychology University of Manchester tel. 0161 275 2557 *********************************** >From: Self <TODD> >To: AUDITORY(at)LISTS.MCGILL.CA >Subject: loud sounds >Date: Tue, 26 Jan 1999 13:29:15 > >Dear List > > I am currently embarking on a small survey of Manchester dance clubs in order >to sample typical intensities in these environments. > > I was wondering if any camparable surveys have been done recently, or in the >last few years. Any references most welcome. > > Thanks > > Neil Todd > Date: Tue, 26 Jan 1999 09:55:48 -0600 To: Neil Todd <TODD(at)fs4.psy.man.ac.uk> From: Sheila Williams <williams(at)psy.utexas.edu> Subject: Re: loud sounds Go for it Neil (sounds like a great excuse!!) Sheila Williams Dr Sheila M Williams phone: 512-471-4253 Psychology, University of Texas at Austin lab: 512-471-0693 528 Mezes Hall, Austin, Texas, USA, 78712 fax: 512-471-6175 Reply-to: <dfreed(at)hei.org> From: "Dan Freed" <dfreed(at)hei.org> To: "'Neil Todd'" <TODD(at)fs4.psy.man.ac.uk> Subject: RE: loud sounds Date: Tue, 26 Jan 1999 10:17:38 -0800 Importance: Normal You might check the following, as well as previous papers by this author: Axelsson A et al. (1995). Hearing in pop/rock musicians: a follow-up study. Ear and Hearing 16(3):245-253. There have been several articles published on this topic in the Journal of the Audio Engineering Society over the years. Some of these are rather old (1970s). Here's the most recent one: Dibble K (1995). Hearing loss and music. Journal of the Audio Engineering Society 43(4):251-?. You can search the AES journal database online at http://www.aes.org/journal/search.html. Dan Freed Software Engineer, Hearing Aid Research Laboratory House Ear Institute 2100 W. Third St., Fifth Floor Los Angeles, CA 90057 USA Phone: +1-213-353-7084 Fax: +1-213-413-0950 Email: dfreed(at)hei.org Date: Tue, 26 Jan 1999 12:53:35 -0500 To: Neil Todd <TODD(at)fs4.psy.man.ac.uk> From: "Richard J. Fabbri" <fabbri(at)netaxis.com> Subject: loud sounds Todd, I would wear good ear protection during your survey as I've heard the experts in this field are all deaf. Rich Date: Tue, 26 Jan 1999 15:02:00 +0100 From: Fred Cummins <fred(at)sedano.idsia.ch> To: TODD(at)fs4.psy.man.ac.uk Subject: Re: loud sounds What fun! Which reminds me, I never did get to say thanks for the packet of papers you left me at the ASA! cheers, Fred -- '''''''''''''''''''''''''''''''''' Fred Cummins, IDSIA, Corso Elvezia 36, CH-6900 Lugano, Switzerland Web: www.idsia.ch/~fred email: fred at idsia.ch (replace ' at ' with '(at)') '''''''''''''''''''''''''''''''''' Date: Tue, 26 Jan 1999 15:29:38 +0100 (MET) From: Christophe Couvreur <ccouvreu(at)baard.lhs.be> To: Neil Todd <TODD(at)fs4.psy.man.ac.uk> Subject: Re: loud sounds Organization: Lernout & Hauspie Speech Products You might want to have a look at the noise control engineering literature. I remember seeing a paper on a similar topic at the InterNoise '94 conference in Leuven, Belgium. Sorry if I can't be more precise, but this was in a previous life in a different field... Christophe Couvreur -- Dr. Ir. Christophe Couvreur Basic Research Division, Lernout & Hauspie Speech Products Koning Albert laan 64, B-1789 Wemmel (Belgium) Tel. +32-2-456.05.00, Fax +32-2-460.01.72 Date: Wed, 27 Jan 1999 11:09:21 -0800 From: Erick Gallun <erick(at)EAR.PSYCH.BERKELEY.EDU> Subject: Re: loud sounds Neil, I have a webpage reference (http://interact.uoregon.edu/MediaLit/FA/MLArticleFolder/common.html), but no actual surveys are cited. You might see where this guy got his info. His phone number used to be on his website but isn't anymore. Write me at erick(at)ear.berkeley.edu if you want it. erick Date: Thu, 18 Feb 1999 09:09:01 -0400 (AST) From: "Dr.Marek Roland-Mieszkowski" <roland(at)is.dal.ca> To: Todd(at)fs4.psy.man.ac.uk Cc: acohen(at)upei.ca Subject: *** Noise in clubs *** Mr.Neil Todd Lecturer in Psychology University of Manchester England Dear Mr.Todd, February 18, 1999 1.Your E-mail was forwarded to me by Dr.Annabel Cohen. 2.We did study of noise in the Halifax clubs in the period 1982-1987. Levels were sometimes up to 129 dB on C scale, fast response. 3.For more info about noise please take a look at: http://www.digital-recordings.com http://www.hearnet.com 4.Please let me know your results from Manchester dance clubs. Looking forward to hearing from you....... Best regards, Marek Roland-Mieszkowski, M.Sc., Ph.D. President, Digital Recordings, Canada tel./ fax. (902) 429-9622 or 425-1154 E-mail: info(at)digital-recordings.com WWW: http://www.digital-recordings.com

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