Re: [AUDITORY] Tweeters for noise trauma (=?UTF-8?Q?Boris_Gour=c3=a9vitch?= )


Subject: Re: [AUDITORY] Tweeters for noise trauma
From:    =?UTF-8?Q?Boris_Gour=c3=a9vitch?=  <boris@xxxxxxxx>
Date:    Sat, 13 Feb 2021 12:04:15 +0100

This is a multi-part message in MIME format. --------------FE29801E6DD75D6D15AB9AB8 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by edgeum4.it.mcgill.ca id 11DB4LMN099840 Thank you everyone for your replies. A short summary of some replies to=20 the list or those I received in private messages as well: - distance really matters. From the data at 1m away, you can easily add=20 6dB when halving the distance and therefore 18dB at 12cm of the ear. I=20 must admit I completely forgot this point when I asked my question. - a 3D cone or an insert will amplidy again the signal energy to reach=20 traumatizing levels but in that case it is mostly valid for one animal=20 or even one ear. - common tweeters could do the job thanks to these distance/cone tricks.=20 Their quality/frequency range does not always allow reaching very high=20 frequencies - sensitivity at 1m is crucial here and depends on the quality of the=20 manufacturer. If we start from 86 dB at 1m, it is not the same than=20 starting from 96 dB to use the distance/cone tricks - compression drivers could be a solution. They are not expensive and=20 reach much higher SPLs. See here the sensitivity for instance=20 http://www.bmsspeakers.com/index.php?id=3Dcompression_drivers - going upper than 20kHz (because of mice) might be a problem for common=20 tweeters and even compression drivers. 30kHz could be possible (see=20 smallest BMS drivers) but I've seen no solution for 40kHz for instance.=20 This is not common for traumas though but this is to remember when using=20 white noise for instance. - speakers specs have to be checked when calibrating the speaker you=20 bought, you can't only trust the manufacturer and there is a variability=20 from one speaker to another as well (I observed that with the TDT EC1=20 speakers by the way even if they're very good) many thanks again, have a good week-end Boris Le 12/02/2021 =E0 16:25, Bernstein,Leslie a =E9crit=A0: > I'm copying here a response that Dr. Doug Oliver sent to Boris and I'm=20 > attaching the documentation: > > /We have had great success with Eminence tweeters when they are=20 > modified to prevent overheating. A protocol is attached. We are using=20 > 116 dB at 11 cm from the front of the horn on awake mice. After=20 > modification, our speakers have lasted over a year. At least 40 hours=20 > of use, one hour at a time.////Best of luck./ > > Les Bernstein > > On 2/12/2021 12:10 AM, Bob Masta wrote: >> *** Attention: This is an external email. Use caution responding, open= ing attachments or clicking on links. *** >> >> Speaker specs are always given at 1 meter distance. Animals being exp= osed are >> usually much closer. >> >> Note that this can cause its own problems if you are trying to expose = multiple >> animals using multiple close-by speakers, which will create interferen= ce >> patterns. With noise stimuli, I have been able to reduce that problem= somewhat >> by using two unrelated noise sources to drive alternate tweeters in th= e array. >> >> Another issue is that the animal will move around in its cage, and may= thus >> move out of the main beam of a close-by speaker if it has space to do = so. >> >> Since you mentioned mice, I expect you will be working above 20 kHz. = Tweeter >> frequency responses tend to be very ragged in this region, probably si= nce they >> are made for humans(!). Be sure to get curves for the models you are >> interested in. >> >> Also note that simple speaker power-handling specs can be misleading i= n a major >> way, if they assume that the speaker is used to reproduce music, and t= hey state >> the power applied to a full-range system that uses that tweeter. Assu= ming a >> pink-noise power distribution that falls at 3 dB/oct, with the woofer = using the >> most power, the tweeter gets very little. >> >> You may have to contact the maker directly for relevant data. High-po= wer >> tweeters tend to be expensive ($40 US seems to be typical at >> https://urldefense.com/v3/__http://www.parts-express.com__;!!N0rdg9Wr!= 7g1-G7NsB8QT8y74rn5s0MhRhUHyHf_6d1Eehj5K0JcYeq5z5_0abG2259kayIA9Cw$ the= se days). The last time I set up a system to do this >> was 2007. I ordered one each of 2 prospective models and ran my own te= sts. I >> think they are out of production now. The Pyramid TW47 was the one I = chose. >> It hit 121 dB SPL at 9 inches driven by 4 Vrms in 1/3rd octave around = 10 kHz, >> or 118 dB with a full octave at 16 kHz. >> >> Hope this helps! >> >> Bob Masta >> >> >> ------------------------- >> On 11 Feb 2021 at 11:12, Boris Gour=E9vitch wrote: >> >>> Dear auditory list, >>> >>> I was looking for a speaker (probably a tweeter) that would reach 120= to >>> maybe 130 dB SPL in a high frequency range (for mice). >>> >>> I am a bit puzzled with the many papers inducing noise trauma (i.e. >>> Warren, Fenton et al, J Neuroscience 2020; Amanipour et al, 2018; Che= n, >>> Sheppar and Salvi 2016; Novak, Zelenka et al, 2016) which actually us= ed >>> pretty common tweeters to do that. Technical specifications for these >>> tweeters do not really indicate that they could handle such high SPL >>> (and therefore such high voltage). How did they determine that ? How = can >>> we know then ? Only by sensitivity measure adjusted for the watt powe= r >>> of the speaker ? >>> >>> Let's take an example: in the Warren et al above cited, the Visaton >>> speaker from RadioSpare is used to deliver 3kHz at 126 dB SPL. The >>> technical specifications >>> (https://urldefense.com/v3/__https://docs.rs-online.com/170c/0900766b= 802e5b23.pdf__;!!N0rdg9Wr!7g1-G7NsB8QT8y74rn5s0MhRhUHyHf_6d1Eehj5K0JcYeq5= z5_0abG2259mXNym04A$ ) indicate 30W max >>> and a sensitivity of 86 dB. Thus, it seems that this speaker could no= t >>> deliver above 101 dB SPL. How did the authors do to avoid damaging th= eir >>> speaker ? >>> >>> Same question with other speakers as well. I'm not an >>> acoustician/electronician and I am probably missing something here. >>> >>> Many thanks for your help. Also, many of the tweeters from the papers >>> above are discontinued so if you know a pretty robust one that you ar= e >>> safely using at high SPLs, please do not hesitate to tell me. >>> >>> Best regards >>> >>> Boris >>> >>> -- >>> Dr Boris Gour=E9vitch >>> CNRS Researcher >>> >>> Institut de l'Audition >>> UMR1120 Inserm, Institut Pasteur >>> 63 rue de Charenton >>> 75012 Paris, France >>> >>> Tel: (+33) 1 76 53 50 41 >>> >>> Personal Web page:https://urldefense.com/v3/__http://www.pi314.net/__= ;!!N0rdg9Wr!7g1-G7NsB8QT8y74rn5s0MhRhUHyHf_6d1Eehj5K0JcYeq5z5_0abG2259nZ4= -XLPA$ >>> >>> >>> -- >>> L'absence de virus dans ce courrier =E9lectronique a =E9t=E9 v=E9rifi= =E9e par le >>> logiciel antivirus Avast.https://urldefense.com/v3/__https://www.avas= t.com/antivirus__;!!N0rdg9Wr!7g1-G7NsB8QT8y74rn5s0MhRhUHyHf_6d1Eehj5K0JcY= eq5z5_0abG2259kfhXW54Q$ > > > --=20 > *Leslie R. Bernstein, Ph.D. **| *Professor > Depts. of Neuroscience and Surgery (Otolaryngology) | UConn School of=20 > Medicine > 263 Farmington Avenue, Farmington, CT 06030-3401 > Office: 860.679.4622 | Fax: 860.679.2495 > > --------------FE29801E6DD75D6D15AB9AB8 Content-Type: multipart/related; boundary="------------0FCA82530F74E4D41E9BAB75" --------------0FCA82530F74E4D41E9BAB75 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: base64 PGh0bWw+CiAgPGhlYWQ+CiAgICA8bWV0YSBodHRwLWVxdWl2PSJDb250ZW50LVR5cGUiIGNv bnRlbnQ9InRleHQvaHRtbDsKICAgICAgY2hhcnNldD13aW5kb3dzLTEyNTIiPgogIDwvaGVh ZD4KICA8Ym9keT4KICAgIDxkaXYgY2xhc3M9Im1vei1jaXRlLXByZWZpeCI+VGhhbmsgeW91 IGV2ZXJ5b25lIGZvciB5b3VyIHJlcGxpZXMuIEEKICAgICAgc2hvcnQgc3VtbWFyeSBvZiBz b21lIHJlcGxpZXMgdG8gdGhlIGxpc3Qgb3IgdGhvc2UgSSByZWNlaXZlZCBpbgogICAgICBw cml2YXRlIG1lc3NhZ2VzIGFzIHdlbGw6PC9kaXY+CiAgICA8ZGl2IGNsYXNzPSJtb3otY2l0 ZS1wcmVmaXgiPjxicj4KICAgIDwvZGl2PgogICAgPGRpdiBjbGFzcz0ibW96LWNpdGUtcHJl 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This message came from the mail archive
src/postings/2021/
maintained by:
DAn Ellis <dpwe@ee.columbia.edu>
Electrical Engineering Dept., Columbia University