Re: [AUDITORY] loudspeaker recommendations (Kevin Austin )


Subject: Re: [AUDITORY] loudspeaker recommendations
From:    Kevin Austin  <kevin.austin@xxxxxxxx>
Date:    Wed, 8 Mar 2017 20:53:17 -0500
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

--Apple-Mail=_51061FAF-4C05-40C8-A555-3BB69274E25E Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 I think it also depends upon budget, and the objectives of the study. If = you have the budget, the speaker will be mounted in the wall so that = there is not sound coming out of the sides or back of the speaker. In a = true free-field situation, out of doors or an anechoic chamber, these = side, top, bottom and back vibrations should not reach the listener=E2=80=99= s ears [with the possible exception of very long wavelengths]. Room = coloration can be reduced by proximity to the speaker. Elevation and = angle of the drivers will also vary from listener to listener. Not all coaxial speakers are made equal. You would want the driver to be = phase and time-aligned to avoid phase cancellations through the = crossover frequency. If you need high quality, which you seem to be looking for, I would = imagine the minimum cost of this speaker would start around five-hundred = pounds sterling. Acquiring =E2=80=98one=E2=80=99 high quality speaker = may mean going to the manufacturer. High quality speakers are often sold = as pairs, matched as precisely as possible. The speaker, ideally, will come with a printout of its response curves. I use Dynaudio BM5 mkIII at home, and the tweeters are about 45-50 cm = from my ears, aimed directly at my eyes. They may have been = discontinued. Try contacting Dynaudio with the specifics of your needs. Kevin > On 2017, Mar 7, at 5:26 PM, Chait, Maria <m.chait@xxxxxxxx> wrote: >=20 > Dear Colleagues, > So far we have been conducting our behavioural experiments 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. > =20 > Our requirements: Experiments are conducted in a small-ish = sound-proof booth, 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 =E2=80=98soundscapes=E2= =80=99. =20 > My understanding is that we should prefer single cone speakers? > =20 > Many thanks, > Maria > =20 > =20 > Maria Chait PhD > m.chait@xxxxxxxx <mailto:m.chait@xxxxxxxx> > Reader in Auditory Cognitive Neuroscience=20 > Lab site: http://www.ucl.ac.uk/ear/research/chaitlab/ = <http://www.ucl.ac.uk/ear/research/chaitlab/> > UCL Ear Institute > 332 Gray's Inn Road > London WC1X 8EE --Apple-Mail=_51061FAF-4C05-40C8-A555-3BB69274E25E Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 <html><head><meta http-equiv=3D"Content-Type" content=3D"text/html = charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; = -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" = class=3D""><div class=3D""><br class=3D""></div><div class=3D"">I think = it also depends upon budget, and the objectives of the study. If you = have the budget, the speaker will be mounted in the wall so that there = is not sound coming out of the sides or back of the speaker. In a true = free-field situation, out of doors or an anechoic chamber, these side, = top, bottom and back vibrations should not reach the listener=E2=80=99s = ears [with the possible exception of very long wavelengths]. Room = coloration can be reduced by proximity to the speaker. Elevation and = angle of the drivers will also vary from listener to listener.</div><div = class=3D""><br class=3D""></div><div class=3D"">Not all coaxial speakers = are made equal. You would want the driver to be phase and time-aligned = to avoid phase cancellations through the crossover frequency.</div><div = class=3D""><br class=3D""></div><div class=3D"">If you need high = quality, which you seem to be looking for, I would imagine the minimum = cost of this speaker would start around five-hundred pounds sterling. = Acquiring =E2=80=98one=E2=80=99 high quality speaker may mean going to = the manufacturer. High quality speakers are often sold as pairs, matched = as precisely as possible.</div><div class=3D""><br class=3D""></div><div = class=3D"">The speaker, ideally, will come with a printout of its = response curves.</div><div class=3D""><br class=3D""></div><div = class=3D"">I use Dynaudio BM5 mkIII at home, and the tweeters are about = 45-50 cm from my ears, aimed directly at my eyes. They may have been = discontinued. Try contacting Dynaudio with the specifics of your = needs.</div><div class=3D""><br class=3D""></div><div = class=3D"">Kevin</div><div class=3D""><br class=3D""></div><div = class=3D""><br class=3D""></div><div class=3D""><br class=3D""></div><br = class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On = 2017, Mar 7, at 5:26 PM, Chait, Maria &lt;<a = href=3D"mailto:m.chait@xxxxxxxx" class=3D"">m.chait@xxxxxxxx</a>&gt; = wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div = class=3D"WordSection1" style=3D"page: WordSection1; font-family: = CourierNewPSMT; font-size: 18px; font-style: normal; font-variant-caps: = normal; font-weight: normal; letter-spacing: normal; orphans: auto; = text-align: start; text-indent: 0px; text-transform: none; white-space: = normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: = 0px;"><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; = font-family: Calibri, sans-serif;" class=3D"">Dear Colleagues,<o:p = class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; = font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">So far we = have been conducting our behavioural experiments using high quality = headphones, but for various reasons will need to shift to using free = field sound presentation for some of our work. &nbsp;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 = class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; = font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p = class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; = font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">Our = requirements: &nbsp;Experiments are conducted in a small-ish sound-proof = booth, 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 =E2=80=98soundscapes=E2=80=99. = &nbsp;<o:p class=3D""></o:p></div><div style=3D"margin: 0cm 0cm = 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" = class=3D"">My understanding is that we should prefer single cone = speakers?<o:p class=3D""></o:p></div><div style=3D"margin: 0cm 0cm = 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" = class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm = 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" = class=3D"">Many thanks,<o:p class=3D""></o:p></div><div style=3D"margin: = 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" = class=3D"">Maria<o:p class=3D""></o:p></div><div style=3D"margin: 0cm = 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" = class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm = 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" = class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm = 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" = class=3D"">Maria Chait PhD<o:p class=3D""></o:p></div><div = style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: = Calibri, sans-serif;" class=3D""><a href=3D"mailto:m.chait@xxxxxxxx" = style=3D"color: purple; text-decoration: underline;" class=3D""><span = style=3D"color: blue;" class=3D"">m.chait@xxxxxxxx</span></a><o:p = class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; = font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">Reader in = Auditory Cognitive Neuroscience<span = class=3D"Apple-converted-space">&nbsp;</span><o:p = class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; = font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">Lab = site:&nbsp;<a href=3D"http://www.ucl.ac.uk/ear/research/chaitlab/" = style=3D"color: purple; text-decoration: underline;" class=3D""><span = style=3D"color: blue;" = class=3D"">http://www.ucl.ac.uk/ear/research/chaitlab/</span></a><o:p = class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; = font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">UCL Ear = Institute<o:p class=3D""></o:p></div><div style=3D"margin: 0cm 0cm = 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" = class=3D"">332 Gray's Inn Road<o:p class=3D""></o:p></div><div = style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: = Calibri, sans-serif;" class=3D"">London WC1X = 8EE</div></div></div></blockquote></div><br class=3D""></body></html>= --Apple-Mail=_51061FAF-4C05-40C8-A555-3BB69274E25E--


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