Subject: Re: [AUDITORY] loudspeaker recommendations From: Peter Lennox <P.Lennox@xxxxxxxx> Date: Wed, 8 Mar 2017 10:01:50 +0000 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>--_000_AM5PR0101MB2467B32EE3FD9623642431AECE2E0AM5PR0101MB2467_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Obviously with a single speaker you are not looking at spatial matters, but= spatial matters have some bearing on the perception of your spectrally ric= h soundscapes. Is the soundproof booth actually anechoic? - if not, (and pr= esuming it's small) there will be frequency dependent effects (of reflectio= ns at some frequencies) and so the signal measured at the eardrums would no= t be the same as that measured at the speaker. I do agree with other commentators that coaxial ought to be best, though ag= ain, if not anechoic, the results of different dispersion characteristics f= or different frequencies might be confounding. regards ppl Dr. Peter Lennox SFHEA Senior Lecturer in Perception College of Arts, Humanities and Education School of Arts e: p.lennox@xxxxxxxx<mailto:p.lennox@xxxxxxxx> t: 01332 593155 https://derby.academia.edu/peterlennox https://www.researchgate.net/profile/Peter_Lennox University of Derby, Kedleston Road, Derby, DE22 1GB, UK ________________________________ From: AUDITORY - Research in Auditory Perception <AUDITORY@xxxxxxxx>= on behalf of Chait, Maria <m.chait@xxxxxxxx> Sent: 07 March 2017 22:26:04 To: AUDITORY@xxxxxxxx Subject: loudspeaker recommendations Dear Colleagues, So far we have been conducting our behavioural experiments using high quali= ty headphones, but for various reasons will need to shift to using free fie= ld sound presentation for some of our work. I was hoping you might be able= to recommend a high quality loud speaker to use for this purpose; Ideally,= one that we can purchase easily from the UK. Our requirements: Experiments are conducted in a small-ish sound-proof boo= th, and we plan to position a single loudspeaker about 50-70 cm in front of= the listener (space constraints prevents this from being any further away)= . Stimuli are spectrally rich =91soundscapes=92. My understanding is that we should prefer single cone speakers? Many thanks, Maria Maria Chait PhD m.chait@xxxxxxxx<mailto:m.chait@xxxxxxxx> Reader in Auditory Cognitive Neuroscience Lab site: http://www.ucl.ac.uk/ear/research/chaitlab/ UCL Ear Institute 332 Gray's Inn Road London WC1X 8EE The University of Derby has a published policy regarding email and reserves= the right to monitor email traffic. If you believe this was sent to you in error, please reply to the sender an= d let them know. Key University contacts: http://www.derby.ac.uk/its/contacts/ --_000_AM5PR0101MB2467B32EE3FD9623642431AECE2E0AM5PR0101MB2467_ Content-Type: text/html; charset="Windows-1252" 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=3D"Content-Type" content=3D"text/html; charset=3DWindows-1= 252"> <meta name=3D"Generator" content=3D"Microsoft Word 14 (filtered medium)"> <style><!-- /* Font Definitions */ @xxxxxxxx {font-family:Calibri; panose-1:2 15 5 2 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"; mso-fareast-language:EN-US;} 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;} span.EmailStyle17 {mso-style-type:personal-compose; font-family:"Calibri","sans-serif"; color:windowtext;} .MsoChpDefault {mso-style-type:export-only; font-family:"Calibri","sans-serif"; mso-fareast-language:EN-US;} @xxxxxxxx WordSection1 {size:612.0pt 792.0pt; margin:72.0pt 72.0pt 72.0pt 72.0pt;} div.WordSection1 {page:WordSection1;} --></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=3D"EN-GB" link=3D"blue" vlink=3D"purple"> <style type=3D"text/css" style=3D"display:none;"><!-- P {margin-top:0;margi= n-bottom:0;} --></style> <div id=3D"divtagdefaultwrapper" style=3D"font-size:12pt;color:#000000;font= -family:Calibri,Arial,Helvetica,sans-serif;" dir=3D"ltr"> <p>Obviously with a single speaker you are not looking at spatial matters, = but spatial matters have some bearing on the perception of your spectrally = rich soundscapes. Is the soundproof booth actually anechoic? - if not,= (and presuming it's small) there will be frequency dependent effects (of reflections at some frequencies) and so= the signal measured at the eardrums would not be the same as that measured= at the speaker.</p> <p>I do agree with other commentators that coaxial ought to be best, though= again, if not anechoic, the results of different dispersion characteristic= s for different frequencies might be confounding.</p> <p>regards</p> <p>ppl</p> <p><br> </p> <div id=3D"Signature"> <div id=3D"divtagdefaultwrapper" dir=3D"ltr" style=3D"font-size: 12pt; colo= r: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "= Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "= Segoe UI Symbol", "Android Emoji", EmojiSymbols;"> <div class=3D"BodyFragment"><font size=3D"2"> <div class=3D"PlainText"><span id=3D"ms-rterangepaste-start"></span> <div> <p class=3D"MsoPlainText">Dr. Peter Lennox SFHEA</p> <p class=3D"MsoPlainText">Senior Lecturer in Perception</p> <p class=3D"MsoPlainText">College of Arts, Humanities and Education </p> <p class=3D"MsoPlainText">School of Arts </p> <p class=3D"MsoPlainText"> </p> <p class=3D"MsoPlainText">e: <a href=3D"mailto:p.lennox@xxxxxxxx" id=3D"= LPNoLP">p.lennox@xxxxxxxx</a> </p> <p class=3D"MsoPlainText">t: 01332 593155</p> <p class=3D"MsoPlainText"> </p> <p class=3D"MsoNormal"><a href=3D"https://derby.academia.edu/peterlennox" i= d=3D"LPNoLP">https://derby.academia.edu/peterlennox</a> </p> <p class=3D"MsoNormal"><a href=3D"https://www.researchgate.net/profile/Pete= r_Lennox" id=3D"LPNoLP">https://www.researchgate.net/profile/Peter_Lennox</= a> </p> <p class=3D"MsoNormal"> </p> <p class=3D"MsoNormal"><span style=3D"font-size:9.0pt; font-family:"Ar= ial",sans-serif">University of Derby,<br> Kedleston Road,<br> Derby,<br> DE22 1GB, UK</span></p> </div> <span id=3D"ms-rterangepaste-end"></span></div> </font></div> </div> </div> </div> <hr style=3D"display:inline-block;width:98%" tabindex=3D"-1"> <div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st= yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> AUDITORY - Research i= n Auditory Perception <AUDITORY@xxxxxxxx> on behalf of Chait, = Maria <m.chait@xxxxxxxx><br> <b>Sent:</b> 07 March 2017 22:26:04<br> <b>To:</b> AUDITORY@xxxxxxxx<br> <b>Subject:</b> loudspeaker recommendations</font> <div> </div> </div> <div> <div class=3D"WordSection1"> <p class=3D"MsoNormal">Dear Colleagues,<o:p></o:p></p> <p class=3D"MsoNormal">So far we have been conducting our behavioural exper= iments using high quality headphones, but for various reasons will need to = shift to using free field sound presentation for some of our work. I = was hoping you might be able to recommend a high quality loud speaker to use for this purpose; Ideally, one that we = can purchase easily from the UK. <o:p></o:p></p> <p class=3D"MsoNormal"><o:p> </o:p></p> <p class=3D"MsoNormal">Our requirements: Experiments are conducted in= a small-ish sound-proof booth, and we plan to position a single loudspeake= r about 50-70 cm in front of the listener (space constraints prevents this = from being any further away). Stimuli are spectrally rich =91soundscapes=92. <o:p></o:p></p> <p class=3D"MsoNormal">My understanding is that we should prefer single con= e speakers?<o:p></o:p></p> <p class=3D"MsoNormal"><o:p> </o:p></p> <p class=3D"MsoNormal">Many thanks,<o:p></o:p></p> <p class=3D"MsoNormal">Maria<o:p></o:p></p> <p class=3D"MsoNormal"><o:p> </o:p></p> <p class=3D"MsoNormal"><o:p> </o:p></p> <p class=3D"MsoNormal">Maria Chait PhD<o:p></o:p></p> <p class=3D"MsoNormal"><a href=3D"mailto:m.chait@xxxxxxxx"><span style=3D"= color:blue">m.chait@xxxxxxxx</span></a><o:p></o:p></p> <p class=3D"MsoNormal">Reader in Auditory Cognitive Neuroscience <o:p></o:p= ></p> <p class=3D"MsoNormal">Lab site: <a href=3D"http://www.ucl.ac.uk/ear/r= esearch/chaitlab/"><span style=3D"color:blue">http://www.ucl.ac.uk/ear/rese= arch/chaitlab/</span></a><o:p></o:p></p> <p class=3D"MsoNormal">UCL Ear Institute<o:p></o:p></p> <p class=3D"MsoNormal">332 Gray's Inn Road<o:p></o:p></p> <p class=3D"MsoNormal">London WC1X 8EE<o:p></o:p></p> <p class=3D"MsoNormal"><o:p> </o:p></p> </div> </div> <br> <br> The University of Derby has a published policy regarding email and reserves= the right to monitor email traffic. <br> If you believe this was sent to you in error, please reply to the sender an= d let them know.<br> <br> Key University contacts: http://www.derby.ac.uk/its/contacts/ </body> </html> --_000_AM5PR0101MB2467B32EE3FD9623642431AECE2E0AM5PR0101MB2467_--