Subject: Re: [AUDITORY] speakers at ear level From: =?utf-8?Q?Krzysztof_Basi=C5=84ski?= <k.basinski@xxxxxxxx> Date: Fri, 20 Jun 2025 10:36:48 +0200--Apple-Mail=_A7FDAD90-344C-4C82-A44E-F40AB2FF81D1 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Sam, I=E2=80=99m no physicist but was a sound engineer once=E2=80=A6 The = phenomenon you're describing is well known and has to do with the = directionality of high frequencies. What they tell you in sound = engineering 101 is to place your tweeters at ear level because they are = the ones that emit high frequencies (~ 1-2 kHz and higher). Woofers can = be lower, higher, whatever you want because they emit low and mid = frequencies. Here=E2=80=99s a nice little blog post that tries to explain the physics = of it: = https://www.theaudioblog.org/post/why-high-frequencies-are-directional-and= -low-aren-t . I don=E2=80=99t think there=E2=80=99s much psychology here = to be honest - just the fact that your auditory system receives less = high frequency power when your ears are not level with the tweeters. I=E2=80=99m sure there are much more competent people here that will be = able to explain the physics in greater detail=E2=80=A6 but hope this = helps. Best, Chris -- Krzysztof Basi=C5=84ski, PhD PRINCIPAL INVESTIGATOR Auditory Neuroscience Laboratory <https://informator.gumed.edu.pl/23> anl.gumed.edu.pl <https://mug.edu.pl/> ASSISTANT PROFESSOR Division of Quality of Life Research = <https://informator.gumed.edu.pl/23> Medical University of Gda=C5=84sk krzysztof.basinski@xxxxxxxx <mailto:krzysztof.basinski@xxxxxxxx> zbnjz@xxxxxxxx <mailto:zbnjz@xxxxxxxx> +48 58 349 1569 Tuwima 15, 80-210 Gda=C5=84sk=20 mug.edu.pl=C2=A0 <https://mug.edu.pl/> farU.edu.pl/en=C2=A0 <https://faru.edu.pl/en> =EF=BF=BC=20 This e-mail and attachments to it may include information legally = privileged. It is intended solely for the recipient. If you are not the = recipient,please inform the sender accordingly and delete the e-mail = with all attachments received. Copying and/or disseminating this e-mail = and information included in the e-mail by unauthorised individuals is = strictly prohibited. Your personal data is administered by Medical = University of Gda=C5=84sk. Information on personal data processing is = available at gumed.edu.pl/55839.html <https://gumed.edu.pl/55839.html> > On 19 Jun 2025, at 12:07, Samuel Mehr <sam@xxxxxxxx> wrote: >=20 > Hi all, I was moving offices, set up speakers at my desk and was = reminded of the quite striking difference in sound quality when speakers = are at ear level vs below (even if angled up toward the ears).=20 >=20 > I was just wondering if anyone has resources explaining why this = phenomenon occurs =E2=80=94 has this been studied in any depth? I = imagine the physics of it are plain enough to model, but one also = wonders about the psychology of it, which probably is less = straightforward. >=20 > thanks, > Sam >=20 > =E2=80=94=E2=80=94=E2=80=94 > Samuel Mehr > School of Psychology, University of Auckland > and Child Study Center, Yale University > Be a citizen scientist at themusiclab.org <https://themusiclab.org/>! --Apple-Mail=_A7FDAD90-344C-4C82-A44E-F40AB2FF81D1 Content-Type: multipart/related; type="text/html"; boundary="Apple-Mail=_B93F06DE-E24F-4C6E-ADF7-1A8266A27E5D" --Apple-Mail=_B93F06DE-E24F-4C6E-ADF7-1A8266A27E5D 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"overflow-wrap: break-word; = -webkit-nbsp-mode: space; line-break: = after-white-space;">Sam,<div><br></div><div>I=E2=80=99m no physicist but = was a sound engineer once=E2=80=A6 The phenomenon you're describing is = well known and has to do with the directionality of high frequencies. = What they tell you in sound engineering 101 is to place your tweeters at = ear level because they are the ones that emit high frequencies (~ 1-2 = kHz and higher). Woofers can be lower, higher, whatever you want because = they emit low and mid frequencies.</div><div><br></div><div>Here=E2=80=99s= a nice little blog post that tries to explain the physics of = it: <a = href=3D"https://www.theaudioblog.org/post/why-high-frequencies-are-directi= onal-and-low-aren-t">https://www.theaudioblog.org/post/why-high-frequencie= s-are-directional-and-low-aren-t</a> . I don=E2=80=99t think = there=E2=80=99s much psychology here to be honest - just the fact that = your auditory system receives less high frequency power when your ears = are not level with the tweeters.</div><div><br></div><div>I=E2=80=99m = sure there are much more competent people here that will be able to = explain the physics in greater detail=E2=80=A6 but hope this = helps.</div><div><br></div><div>Best,</div><div>Chris</div><div><div> <meta charset=3D"UTF-8"><div style=3D"font-family: Helvetica; font-size: = 12px; 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; = text-decoration: none; caret-color: rgb(0, 0, 0); color: rgb(0, 0, = 0);"><font face=3D"Arial" color=3D"#023f87" = size=3D"2"><b>--</b></font></div><div style=3D"font-family: Helvetica; = font-size: 12px; 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; = text-decoration: none; caret-color: rgb(0, 0, 0); color: rgb(0, 0, = 0);"><font face=3D"Arial" color=3D"#023f87" size=3D"2"><b>Krzysztof = Basi=C5=84ski, PhD</b><br>PRINCIPAL INVESTIGATOR</font></div><div = style=3D"font-family: Helvetica; font-size: 12px; 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; text-decoration: none; caret-color: = rgb(0, 0, 0); color: rgb(0, 0, 0);"><b style=3D"color: rgb(2, 63, 135); = font-family: Arial;"><a href=3D"https://informator.gumed.edu.pl/23" = style=3D"color: rgb(2, 63, 135) !important;">Auditory Neuroscience = Laboratory</a></b></div><div style=3D"font-family: Helvetica; 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= font-size: 12px; font-style: normal; font-variant-caps: normal; = font-weight: 400; 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; = text-decoration: none; caret-color: rgb(0, 0, 0); color: rgb(0, 0, = 0);"></span><br class=3D"Apple-interchange-newline" style=3D"font-family: = Helvetica; font-size: 12px; font-style: normal; font-variant-caps: = normal; font-weight: 400; 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; = text-decoration: none; caret-color: rgb(0, 0, 0); color: rgb(0, 0, = 0);"><span style=3D"font-family: Helvetica; font-size: 12px; font-style: = normal; font-variant-caps: normal; font-weight: 400; 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; text-decoration: none; caret-color: = rgb(0, 0, 0); color: rgb(0, 0, 0);"></span><span style=3D"font-family: = Helvetica; font-size: 12px; font-style: normal; font-variant-caps: = normal; font-weight: 400; 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; = text-decoration: none; caret-color: rgb(0, 0, 0); color: rgb(0, 0, = 0);"></span><span style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, = 0); font-family: Helvetica; font-size: 12px; font-style: normal; = font-variant-caps: normal; font-weight: 400; 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; text-decoration: = none;"></span><span><img alt=3D"attachment.png" = src=3D"cid:319FB767-0F26-4411-945B-6D0B0F5B4E02"></span><meta = charset=3D"UTF-8"><span style=3D"font-size: 12px; font-style: normal; = font-variant-caps: normal; font-weight: 400; 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; text-decoration: none; caret-color: = rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: = -webkit-standard;"> </span><p style=3D"font-style: normal; = font-variant-caps: normal; font-weight: 400; 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; text-decoration: none; caret-color: = rgb(0, 0, 0); font-size: 0.5em; font-family: arial; color: rgb(128, 128, = 128);"><br>This e-mail and attachments to it may include information = legally privileged. It is intended solely for the recipient. If you are = not the recipient,please inform the sender accordingly and delete the = e-mail with all attachments received. Copying and/or disseminating this = e-mail and information included in the e-mail by unauthorised = individuals is strictly prohibited. Your personal data is administered = by Medical University of Gda=C5=84sk. Information on personal data = processing is available at <a = href=3D"https://gumed.edu.pl/55839.html" style=3D"color: rgb(128, 128, = 128) !important;">gumed.edu.pl/55839.html</a></p> </div> <div><br><blockquote type=3D"cite"><div>On 19 Jun 2025, at 12:07, Samuel = Mehr <sam@xxxxxxxx> wrote:</div><br = class=3D"Apple-interchange-newline"><div><meta charset=3D"UTF-8"><div = class=3D"message-content" style=3D"font-family: -apple-system, = BlinkMacSystemFont, Aptos, Roboto, "Segoe UI", Helvetica, = Arial, sans-serif, "Apple Color Emoji", "Segoe UI = Emoji", "Segoe UI Symbol"; line-height: 1.4; caret-color: = rgb(0, 0, 0); font-size: 12px; font-style: normal; font-variant-caps: = normal; font-weight: 400; letter-spacing: normal; text-align: start; = text-indent: 0px; text-transform: none; white-space: normal; = word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: = none;"><div class=3D"trix-content"><div>Hi all, I was moving offices, = set up speakers at my desk and was reminded of the quite striking = difference in sound quality when speakers are at ear level vs below = (even if angled up toward the ears). <br><br>I was just wondering = if anyone has resources explaining why this phenomenon occurs = =E2=80=94 has this been studied in any depth? I imagine the physics = of it are plain enough to model, but one also wonders about the = psychology of it, which probably is less = straightforward.<br><br>thanks,<br>Sam<br><br></div><div>=E2=80=94=E2=80=94= =E2=80=94<br>Samuel Mehr<br>School of Psychology, University of = Auckland<br>and Child Study Center, Yale University<br><strong>Be a = citizen scientist at<span = class=3D"Apple-converted-space"> </span></strong><a = href=3D"https://themusiclab.org/"><strong>themusiclab.org</strong></a><str= ong>!</strong></div></div></div></div></blockquote></div><br></div></body>= </html>= --Apple-Mail=_B93F06DE-E24F-4C6E-ADF7-1A8266A27E5D Content-Transfer-Encoding: base64 Content-Disposition: inline; filename=attachment.png Content-Type: image/png; name="attachment.png" Content-Id: <319FB767-0F26-4411-945B-6D0B0F5B4E02> iVBORw0KGgoAAAANSUhEUgAAANoAAAAjCAYAAADygBQKAAAACXBIWXMAAA9hAAAPYQGoP6dpAAAb bUlEQVR4nO1dB3hVRfY/M/cVQv6GEoJEJbB2cRFxl0VI8oiFFRXX9hfsvX4WFCwpYIyQIsra3bWy 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