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loud sounds again
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@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@fs4.psy.man.ac.uk>
From: Sheila Williams <williams@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@hei.org>
From: "Dan Freed" <dfreed@hei.org>
To: "'Neil Todd'" <TODD@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@hei.org
Date: Tue, 26 Jan 1999 12:53:35 -0500
To: Neil Todd <TODD@fs4.psy.man.ac.uk>
From: "Richard J. Fabbri" <fabbri@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@sedano.idsia.ch>
To: TODD@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 '@')
''''''''''''''''''''''''''''''''''
Date: Tue, 26 Jan 1999 15:29:38 +0100 (MET)
From: Christophe Couvreur <ccouvreu@baard.lhs.be>
To: Neil Todd <TODD@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@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@ear.berkeley.edu if you want it.
erick
Date: Thu, 18 Feb 1999 09:09:01 -0400 (AST)
From: "Dr.Marek Roland-Mieszkowski" <roland@is.dal.ca>
To: Todd@fs4.psy.man.ac.uk
Cc: acohen@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@digital-recordings.com
WWW: http://www.digital-recordings.com