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mw-list-item"><a href="https://cs.wikipedia.org/wiki/Koss" title="Koss – Czech" lang="cs" hreflang="cs" data-title="Koss" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/KOSS_Corporation" title="KOSS Corporation – German" lang="de" hreflang="de" data-title="KOSS Corporation" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%DA%A9%D8%B3_%DA%A9%D9%88%D8%B1%D9%BE%D9%88%D8%B1%DB%8C%D8%B4%D9%86" title="کس کورپوریشن – Persian" lang="fa" hreflang="fa" data-title="کس کورپوریشن" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Koss_Corporation" title="Koss Corporation – French" lang="fr" hreflang="fr" data-title="Koss Corporation" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Koss_Corporation" title="Koss Corporation – Italian" lang="it" hreflang="it" data-title="Koss Corporation" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%82%B3%E3%82%B9_(%E4%BC%81%E6%A5%AD)" title="コス (企業) – Japanese" lang="ja" hreflang="ja" data-title="コス (企業)" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no 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0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}@media print{body.ns-0 .mw-parser-output .ambox{display:none!important}}</style><table class="box-Lead_too_short plainlinks metadata ambox ambox-content ambox-lead_too_short" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Wiki_letter_w.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/en/thumb/6/6c/Wiki_letter_w.svg/40px-Wiki_letter_w.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/6/6c/Wiki_letter_w.svg/60px-Wiki_letter_w.svg.png 1.5x, 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.infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><style data-mw-deduplicate="TemplateStyles:r1242257876">.mw-parser-output .ib-company .infobox-label{padding-right:0.5em}.mw-parser-output .ib-company .infobox-data,.mw-parser-output .ib-company .infobox-below{line-height:1.35em}.mw-parser-output .ib-company-logo img{background-color:#f8f9fa}.mw-parser-output .ib-company-locality,.mw-parser-output .ib-company-country{display:inline}</style><table class="infobox ib-company vcard"><caption class="infobox-title fn org" style="font-size: 125%;">Koss Corporation</caption><tbody><tr><td colspan="2" class="infobox-image ib-company-logo logo"><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:Koss_Corporation_logo.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/en/thumb/d/d1/Koss_Corporation_logo.svg/220px-Koss_Corporation_logo.svg.png" decoding="async" width="220" height="33" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/d/d1/Koss_Corporation_logo.svg/330px-Koss_Corporation_logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/d/d1/Koss_Corporation_logo.svg/440px-Koss_Corporation_logo.svg.png 2x" data-file-width="189" data-file-height="28" /></a></span></td></tr><tr><th scope="row" class="infobox-label">Company type</th><td class="infobox-data category"><a href="/wiki/Public_company" title="Public company">Public</a></td></tr><tr><th scope="row" class="infobox-label"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Ticker_symbol" title="Ticker symbol">Traded as</a></div></th><td class="infobox-data"><a href="/wiki/Nasdaq" title="Nasdaq">Nasdaq</a>: <a rel="nofollow" class="external text" href="https://www.nasdaq.com/market-activity/stocks/koss">KOSS</a></td></tr><tr><th scope="row" class="infobox-label">Industry</th><td class="infobox-data category"><a href="/wiki/Electronics" title="Electronics">Electronics</a></td></tr><tr><th scope="row" class="infobox-label">Founded</th><td class="infobox-data">1953<span class="noprint">; 72 years ago</span><span style="display:none"> (<span class="bday dtstart published updated">1953</span>)</span></td></tr><tr><th scope="row" class="infobox-label">Headquarters</th><td class="infobox-data label"><a href="/wiki/Milwaukee" title="Milwaukee">Milwaukee</a>, <a href="/wiki/Wisconsin" title="Wisconsin">Wisconsin</a></td></tr><tr><th scope="row" class="infobox-label"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;">Area served</div></th><td class="infobox-data">Worldwide</td></tr><tr><th scope="row" class="infobox-label"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;">Number of employees</div></th><td class="infobox-data">31<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> (2023)</td></tr><tr><th scope="row" class="infobox-label">Website</th><td class="infobox-data"><span class="url"><a rel="nofollow" class="external text" href="http://koss.com">koss<wbr />.com</a></span></td></tr></tbody></table> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Koss_PortaPro.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/54/Koss_PortaPro.jpg/220px-Koss_PortaPro.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/54/Koss_PortaPro.jpg/330px-Koss_PortaPro.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/54/Koss_PortaPro.jpg/440px-Koss_PortaPro.jpg 2x" data-file-width="2000" data-file-height="1500" /></a><figcaption>Koss Porta Pro headphones</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Koss_Pro_4AA_headphones.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/62/Koss_Pro_4AA_headphones.jpg/170px-Koss_Pro_4AA_headphones.jpg" decoding="async" width="170" height="255" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/62/Koss_Pro_4AA_headphones.jpg/255px-Koss_Pro_4AA_headphones.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/62/Koss_Pro_4AA_headphones.jpg/340px-Koss_Pro_4AA_headphones.jpg 2x" data-file-width="3641" data-file-height="5461" /></a><figcaption>Koss Pro/4AA headphones</figcaption></figure> <p><b>Koss Corporation</b> is a <a href="/wiki/Corporation" title="Corporation">company</a> in <a href="/wiki/Milwaukee" title="Milwaukee">Milwaukee</a>, <a href="/wiki/Wisconsin" title="Wisconsin">Wisconsin</a>, US that manufactures <a href="/wiki/Headphones" title="Headphones">headphones</a>. The company created the first <a href="/wiki/High_fidelity" title="High fidelity">high-fidelity</a> stereo headphones in 1958.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Koss_Corporation&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1251242444" /><table class="box-More_citations_needed_section plainlinks metadata ambox ambox-content ambox-Refimprove" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Question_book-new.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x" data-file-width="512" data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This section <b>needs additional citations for <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">verification</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/Koss_Corporation" title="Special:EditPage/Koss Corporation">improve this article</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">adding citations to reliable sources</a> in this section. Unsourced material may be challenged and removed.</span> <span class="date-container"><i>(<span class="date">August 2015</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <p>John C. Koss founded the <b>J.C. Koss Hospital Television Rental Company</b> in 1953.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> After a short time Koss was looking for new ideas, and partnered with Martin Lange to eventually develop a stereo headphone. Based in <a href="/wiki/Milwaukee,_Wisconsin" class="mw-redirect" title="Milwaukee, Wisconsin">Milwaukee, Wisconsin</a>, United States, in 1991 Koss Audio & Video Electronics started producing and selling consumer electronics products as a separate company in <a href="/wiki/Hazelwood,_Missouri" title="Hazelwood, Missouri">Hazelwood, Missouri</a>, United States. The Koss family owns more than 75% of the firm. </p><p>Having only a high school education, John C. Koss worked with Lange, an engineer, to develop the headphone that launched the company almost by accident, as they came upon the headphone idea as a result of an attempt to market a portable phonograph.<sup id="cite_ref-nationsbusiness1990_4-0" class="reference"><a href="#cite_note-nationsbusiness1990-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> What made this product unique was the privacy switch feature, which gave listeners the opportunity to listen to the first Koss SP/3 Stereophones. Initially, the product's purpose was to demonstrate to consumers the high-fidelity stereo sound of the portable phonograph.<sup id="cite_ref-wisconsinhistory.org_5-0" class="reference"><a href="#cite_note-wisconsinhistory.org-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p><p>Until then headphones had only been used in communications applications. In 1958 the design was introduced at a hi-fi trade show in Milwaukee, and audiences approved of it. Soon after the trade show, Koss went into business manufacturing and marketing stereophones from his basement apartment. The technology was imitated by competing manufacturers.<sup id="cite_ref-wisconsinhistory.org_5-1" class="reference"><a href="#cite_note-wisconsinhistory.org-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p><p>In the early 1970s, Koss worked out of two locations near each other. One was Koss TV-Rental, which also did electronics and musical instrument repairs; the second was the main facility two blocks to the east. At this time, Koss pioneered the high-end "electro-static" "ES series" headphone market. These headphones set the standard for wide-range frequency response. Being very durable, they required service for wear and tear on cords and earpads during their lifespan, by K&M Electronics (Klenworth & Midwest based in Minneapolis), working out of the TV Rental location. Koss headphones were easy and cost-effective to repair. At this site, a separate garage was set up to support the musical instrument and electronics repair business. The TV rental and repair site was managed by John's brother Pete Koss. Eventually, Koss dominated the headphone market, competing mainly with Telex. Koss was considered a higher quality unit at the time, offering a wide line of models.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (December 2021)">citation needed</span></a></i>]</sup> </p><p>In the late 1970s, to accommodate rapid growth, Koss moved to its present location on the north side of Milwaukee.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (December 2021)">citation needed</span></a></i>]</sup> </p><p>in the 1980s, Koss tried to diversify, unsuccessfully, into related areas of electronics; in 1984 the company filed for bankruptcy protection after a net loss that year of US$6 million (equivalent to $18.16 million in 2024). Koss emerged from <a href="/wiki/Chapter_11" class="mw-redirect" title="Chapter 11">Chapter 11</a> bankruptcy proceedings in 1985.<sup id="cite_ref-nationsbusiness1990_4-1" class="reference"><a href="#cite_note-nationsbusiness1990-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>In 1991, Michael J. Koss, son of founder John C. Koss, took over as president and chief executive officer.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p><p>In December 2009, former vice president of finance Sujata "Sue" Sachdeva was charged in federal court with <a href="/wiki/Wire_fraud" class="mw-redirect" title="Wire fraud">wire fraud</a> after the firm discovered her <a href="/wiki/Embezzlement" title="Embezzlement">embezzlement</a> of US$34 million (equivalent to $49.83 million in 2024), and sentenced to eleven years in federal prison,<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> of which she served six years.<sup id="cite_ref-release_8-0" class="reference"><a href="#cite_note-release-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> Koss was forced to restate five years of financials.<sup id="cite_ref-fs_9-0" class="reference"><a href="#cite_note-fs-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> It was able to recoup over US$12 million from its former auditor, from Sachdeva's credit card company, and by auctioning Sachdeva's stolen merchandise.<sup id="cite_ref-release_8-1" class="reference"><a href="#cite_note-release-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p><p>In 2020, Koss sued Apple, Bose, JLAB Audio, Plantronics Inc., and Skullcandy for patent infringement.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> In July 2022 Koss and Apple reached a settlement for an undisclosed amount regarding the alleged patent infringement on Koss' intellectual property. <sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p><p>During the 2021 <a href="/wiki/GameStop_short_squeeze" title="GameStop short squeeze">GameStop short squeeze</a>, the executives and directors of Koss earned US$40 million by selling company stock. This was more than the value of the Koss Corporation at the end of 2020.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Products">Products</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Koss_Corporation&action=edit&section=2" title="Edit section: Products"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="wikitable"> <tbody><tr> <th>Product </th> <th>Description </th> <th>Year Released </th></tr> <tr> <td>SP/3 </td> <td>The World's First Stereophone </td> <td>1958 </td></tr> <tr> <td>Pro4 Stereophones </td> <td>Elected #1 by <i>Consumer Union</i> Magazine in 1963 </td> <td>1962 </td></tr> <tr> <td>Beatlephone </td> <td>Beatles Tribute Stereophone </td> <td>1966 </td></tr> <tr> <td>ESP/6 </td> <td>The first self-energizing electrostatic stereophone </td> <td>1968 </td></tr> <tr> <td>Pro4AA </td> <td>Featured a speaker system specially designed for dynamic stereophones </td> <td>1970 </td></tr> <tr> <td>HV1A </td> <td>The first dynamic stereophone to deliver all 10 audible octaves </td> <td>1974 </td></tr> <tr> <td>Porta Pro </td> <td>Portable "high-end supra-aural stereophone model" </td> <td>1984 </td></tr> <tr> <td>JCK/300 Kordless Stereophone System </td> <td>Cordless stereophone system with infrared technology </td> <td>1989 </td></tr> <tr> <td>ESP/950 </td> <td>Electrostatic, complemented by the E/90 amp<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> </td> <td>1990 </td></tr> <tr> <td>QZ1000 </td> <td>Quiet zone noise reduction stereophone </td> <td>1993 </td></tr> <tr> <td>KSC35 </td> <td>Earclip stereophone </td> <td>1995 </td></tr> <tr> <td>The Plug </td> <td>Plug in-ear earphone </td> <td>1999 </td></tr> <tr> <td>Sporta Pro </td> <td>Tilting headband reduces hair/hat interference, based on Porta Pro </td> <td>1999 </td></tr> <tr> <td>QZ/5 </td> <td>Provides isolation from all types of outside noise, high and mid frequency </td> <td>2000 </td></tr> <tr> <td>UR/20 </td> <td>Incorporated a neodymium, rare earth magnet and 16-micron mylar diaphragm for deep bass and treble clarity </td> <td>2000 </td></tr> <tr> <td>KTXPro1 </td> <td>Rubber headband </td> <td>2002 </td></tr> <tr> <td>UR40 </td> <td>Foldable headphones </td> <td>2002 </td></tr> <tr> <td>KSC75 </td> <td>Earclip headphones </td> <td>2004 </td></tr> <tr> <td>CC_01 </td> <td>Earphones with adjustable, in-ear fit. </td> <td>2009 </td></tr> <tr> <td>KDE250 </td> <td>Adjustable earclip headphones </td> <td>2009 </td></tr> <tr> <td>FitClips </td> <td>Earclip activewear headphones designed for women </td> <td>2010 </td></tr> <tr> <td>Striva </td> <td>World's first Wi-Fi headphones </td> <td>2012 </td></tr> <tr> <td>BT540i </td> <td>Wireless headphones with <a href="/wiki/Bluetooth" title="Bluetooth">Bluetooth</a> <a href="/w/index.php?title=AptX_codec&action=edit&redlink=1" class="new" title="AptX codec (page does not exist)">aptX codec</a> </td> <td>2014 </td></tr> <tr> <td>SP Series: SP540 and SP330 </td> <td>Designed specifically for personal listening </td> <td>2014 </td></tr> <tr> <td>Pro4S </td> <td>Professional studio headphones </td> <td>2014 </td></tr> <tr> <td>UR23i </td> <td>Headphones with D-Profile design, In-line one-touch microphone, and tangle-resistant flat cable </td> <td>2015 </td></tr> <tr> <td>KPH14 </td> <td>Side-firing headphones for active lifestyles </td> <td>2015 </td></tr> <tr> <td>KEB25i </td> <td>Headphones with a dynamic element positioned just outside the ear, connected to a tubular port structure that inserts into an expandable cushion </td> <td>2015 </td></tr> <tr> <td>BT539i </td> <td>Headphones with D-Profile design, Bluetooth </td> <td>2017 </td></tr> <tr> <td>KPH30i </td> <td>Pro35/KTXPro1 inspired </td> <td>2017 </td></tr> <tr> <td>PortaPro Wireless </td> <td>In-line mic, onboard controls, wireless </td> <td>2018 </td></tr> <tr> <td>Noise Canceling QZ Buds </td> <td>Monitor mode switch deactivates noise cancelling </td> <td>2018 </td></tr> <tr> <td>CS300 USB </td> <td>Flexible mic, electret mic </td> <td>2018 </td></tr> <tr> <td>Utility Series </td> <td>KPH40, KEB90, and PortPro with detachable cables </td> <td>2021 </td></tr></tbody></table> <p>Koss headphones were also sold in <a href="/wiki/RadioShack" title="RadioShack">RadioShack</a> stores under their own brand. The Koss Plug and Koss Spark Plug are in-ear passive noise-isolating earphones; they can be adapted to take the high-end Etymotics ear tip, becoming the "Koss Hybrid". Other models include the Koss Porta Pro and well-regarded budget-priced headphones including the KSC series.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> Since 1989, all headphones manufactured in North America by KOSS come with a limited lifetime warranty covering normal use by the initial owner.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> Returning to the pre-Koss use of headphones, Koss produces communications headsets with microphone.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Notes">Notes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Koss_Corporation&action=edit&section=3" title="Edit section: Notes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://investors.koss.com/node/10871/html#Business:~:text=As%20of%20June%C2%A030%2C%202023%2C%20the%20Company%20employed%2031%C2%A0non%2Dunion%20employees">"SEC Filing | Koss Corporation"</a>. <i>investors.koss.com</i>. June 20, 2023.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=investors.koss.com&rft.atitle=SEC+Filing+%7C+Koss+Corporation&rft.date=2023-06-20&rft_id=https%3A%2F%2Finvestors.koss.com%2Fnode%2F10871%2Fhtml%23Business%3A~%3Atext%3DAs%2520of%2520June%25C2%25A030%252C%25202023%252C%2520the%2520Company%2520employed%252031%25C2%25A0non%252Dunion%2520employees&rfr_id=info%3Asid%2Fen.wikipedia.org%3AKoss+Corporation" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://coolmaterial.com/roundup/history-of-headphones/">"The History of Headphones | Cool Material"</a>. <i>coolmaterial.com</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2015-09-10</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=coolmaterial.com&rft.atitle=The+History+of+Headphones+%7C+Cool+Material&rft_id=http%3A%2F%2Fcoolmaterial.com%2Froundup%2Fhistory-of-headphones%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AKoss+Corporation" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.fundinguniverse.com/company-histories/koss-corporation-history/">"Koss Corporation History"</a>. <i>fundinguniverse</i><span class="reference-accessdate">. Retrieved <span class="nowrap">9 June</span> 2020</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=fundinguniverse&rft.atitle=Koss+Corporation+History&rft_id=http%3A%2F%2Fwww.fundinguniverse.com%2Fcompany-histories%2Fkoss-corporation-history%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AKoss+Corporation" class="Z3988"></span></span> </li> <li id="cite_note-nationsbusiness1990-4"><span class="mw-cite-backlink">^ <a href="#cite_ref-nationsbusiness1990_4-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-nationsbusiness1990_4-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFBarrier1990" class="citation news cs1">Barrier, Michael (1990). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20080220035819/http://findarticles.com/p/articles/mi_m1154/is_n8_v78/ai_9237565">"Life after near-death - Koss Corp. near bankruptcy"</a>. <i>Nation's Business</i>. Archived from <a rel="nofollow" class="external text" href="http://findarticles.com/p/articles/mi_m1154/is_n8_v78/ai_9237565">the original</a> on 2008-02-20.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Nation%27s+Business&rft.atitle=Life+after+near-death+-+Koss+Corp.+near+bankruptcy&rft.date=1990&rft.aulast=Barrier&rft.aufirst=Michael&rft_id=http%3A%2F%2Ffindarticles.com%2Fp%2Farticles%2Fmi_m1154%2Fis_n8_v78%2Fai_9237565&rfr_id=info%3Asid%2Fen.wikipedia.org%3AKoss+Corporation" class="Z3988"></span></span> </li> <li id="cite_note-wisconsinhistory.org-5"><span class="mw-cite-backlink">^ <a href="#cite_ref-wisconsinhistory.org_5-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-wisconsinhistory.org_5-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.wisconsinhistory.org/Content.aspx?dsNav=N:4294963828-4294963805&dsRecordDetails=R:CS524">"John C. Koss Receives Wisconsin History Maker Award | Wisconsin Historical Society"</a>. <i>www.wisconsinhistory.org</i>. 9 May 2007<span class="reference-accessdate">. Retrieved <span class="nowrap">2015-09-10</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.wisconsinhistory.org&rft.atitle=John+C.+Koss+Receives+Wisconsin+History+Maker+Award+%7C+Wisconsin+Historical+Society&rft.date=2007-05-09&rft_id=http%3A%2F%2Fwww.wisconsinhistory.org%2FContent.aspx%3FdsNav%3DN%3A4294963828-4294963805%26dsRecordDetails%3DR%3ACS524&rfr_id=info%3Asid%2Fen.wikipedia.org%3AKoss+Corporation" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.bloomberg.com/research/stocks/people/person.asp?personId=283452&privcapId=283448">"Michael J. Koss: Executive Profile & Biography"</a>. <i>Bloomberg</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2017-12-06</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Bloomberg&rft.atitle=Michael+J.+Koss%3A+Executive+Profile+%26+Biography&rft_id=https%3A%2F%2Fwww.bloomberg.com%2Fresearch%2Fstocks%2Fpeople%2Fperson.asp%3FpersonId%3D283452%26privcapId%3D283448&rfr_id=info%3Asid%2Fen.wikipedia.org%3AKoss+Corporation" class="Z3988"></span></span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.nbcnews.com/id/wbna40245372">"Ex-Koss exec gets 11 years for $34 million embezzlement"</a>. NBC News.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Ex-Koss+exec+gets+11+years+for+%2434+million+embezzlement&rft.pub=NBC+News&rft_id=https%3A%2F%2Fwww.nbcnews.com%2Fid%2Fwbna40245372&rfr_id=info%3Asid%2Fen.wikipedia.org%3AKoss+Corporation" class="Z3988"></span></span> </li> <li id="cite_note-release-8"><span class="mw-cite-backlink">^ <a href="#cite_ref-release_8-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-release_8-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFSpivak2017" class="citation news cs1">Spivak, Cary (April 6, 2017). <a rel="nofollow" class="external text" href="https://www.jsonline.com/story/money/business/2017/04/06/sachdeva-out-prison-after-serving-six-years-stealing-34-million-koss-corp/100129710/">"Sachdeva out of prison after serving six years for stealing $34 million from Koss Corp"</a>. <i><a href="/wiki/Milwaukee_Journal-Sentinel" class="mw-redirect" title="Milwaukee Journal-Sentinel">Milwaukee Journal-Sentinel</a></i><span class="reference-accessdate">. Retrieved <span class="nowrap">2018-01-17</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Milwaukee+Journal-Sentinel&rft.atitle=Sachdeva+out+of+prison+after+serving+six+years+for+stealing+%2434+million+from+Koss+Corp.&rft.date=2017-04-06&rft.aulast=Spivak&rft.aufirst=Cary&rft_id=https%3A%2F%2Fwww.jsonline.com%2Fstory%2Fmoney%2Fbusiness%2F2017%2F04%2F06%2Fsachdeva-out-prison-after-serving-six-years-stealing-34-million-koss-corp%2F100129710%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AKoss+Corporation" class="Z3988"></span></span> </li> <li id="cite_note-fs-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-fs_9-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFNewquist2010" class="citation web cs1">Newquist, Caleb (July 1, 2010). <a rel="nofollow" class="external text" href="http://goingconcern.com/koss-files-restated-financial-statements-just-in-the-nick-of-time/">"Koss Files Restated Financial Statements, Just in the Nick of Time"</a>. goingconcern<span class="reference-accessdate">. Retrieved <span class="nowrap">2018-01-17</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Koss+Files+Restated+Financial+Statements%2C+Just+in+the+Nick+of+Time&rft.pub=goingconcern&rft.date=2010-07-01&rft.aulast=Newquist&rft.aufirst=Caleb&rft_id=http%3A%2F%2Fgoingconcern.com%2Fkoss-files-restated-financial-statements-just-in-the-nick-of-time%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AKoss+Corporation" class="Z3988"></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.jsonline.com/story/money/business/2020/07/23/koss-charges-apple-bose-and-three-others-patent-infringement-lawsuits/5494084002/">"Headphone maker Koss Corp. Sues Apple, Bose and three others for patent infringement"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Headphone+maker+Koss+Corp.+Sues+Apple%2C+Bose+and+three+others+for+patent+infringement&rft_id=https%3A%2F%2Fwww.jsonline.com%2Fstory%2Fmoney%2Fbusiness%2F2020%2F07%2F23%2Fkoss-charges-apple-bose-and-three-others-patent-infringement-lawsuits%2F5494084002%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AKoss+Corporation" class="Z3988"></span></span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFBrittain2022" class="citation news cs1">Brittain, Blake (25 July 2022). <a rel="nofollow" class="external text" href="https://www.reuters.com/legal/litigation/apple-koss-settle-wireless-headphone-patent-fight-before-trial-2022-07-25/">"Apple, Koss settle wireless-headphone patent fight before trial"</a>. <i>Reuters</i>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Reuters&rft.atitle=Apple%2C+Koss+settle+wireless-headphone+patent+fight+before+trial&rft.date=2022-07-25&rft.aulast=Brittain&rft.aufirst=Blake&rft_id=https%3A%2F%2Fwww.reuters.com%2Flegal%2Flitigation%2Fapple-koss-settle-wireless-headphone-patent-fight-before-trial-2022-07-25%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AKoss+Corporation" class="Z3988"></span></span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFHauer2021" class="citation news cs1">Hauer, Sarah (February 4, 2021). <a rel="nofollow" class="external text" href="https://www.jsonline.com/story/money/business/2021/02/04/koss-family-got-32-million-reddit-fueled-stock-market-frenzy/4383792001/">"Koss family got $32 million from Reddit-fueled stock market frenzy -- more than the company was worth at the end of 2020"</a>. <i><a href="/wiki/Milwaukee_Journal_Sentinel" title="Milwaukee Journal Sentinel">Milwaukee Journal Sentinel</a></i>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Milwaukee+Journal+Sentinel&rft.atitle=Koss+family+got+%2432+million+from+Reddit-fueled+stock+market+frenzy+--+more+than+the+company+was+worth+at+the+end+of+2020&rft.date=2021-02-04&rft.aulast=Hauer&rft.aufirst=Sarah&rft_id=https%3A%2F%2Fwww.jsonline.com%2Fstory%2Fmoney%2Fbusiness%2F2021%2F02%2F04%2Fkoss-family-got-32-million-reddit-fueled-stock-market-frenzy%2F4383792001%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AKoss+Corporation" class="Z3988"></span></span> </li> <li id="cite_note-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-13">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFGuttenberg" class="citation web cs1">Guttenberg, Steve. <a rel="nofollow" class="external text" href="https://www.cnet.com/tech/mobile/the-koss-esp-950-headphone-dazzles-the-audiophiliac/">"The Koss ESP-950 headphone dazzles the Audiophiliac"</a>. <i>CNET</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2023-04-17</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=CNET&rft.atitle=The+Koss+ESP-950+headphone+dazzles+the+Audiophiliac&rft.aulast=Guttenberg&rft.aufirst=Steve&rft_id=https%3A%2F%2Fwww.cnet.com%2Ftech%2Fmobile%2Fthe-koss-esp-950-headphone-dazzles-the-audiophiliac%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AKoss+Corporation" class="Z3988"></span></span> </li> <li id="cite_note-14"><span class="mw-cite-backlink"><b><a href="#cite_ref-14">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.headphone.com/products/headphones/all-headphones/koss-ksc-75.php">Koss KSC 75 @ HeadRoom - Right Between Your Ears</a></span> </li> <li id="cite_note-15"><span class="mw-cite-backlink"><b><a href="#cite_ref-15">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://koss.com/pages/warranty-repair">"Warranty Repair"</a>. <i>Koss Stereophones</i>. 7 February 2019.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Koss+Stereophones&rft.atitle=Warranty+Repair&rft.date=2019-02-07&rft_id=https%3A%2F%2Fkoss.com%2Fpages%2Fwarranty-repair&rfr_id=info%3Asid%2Fen.wikipedia.org%3AKoss+Corporation" class="Z3988"></span></span> </li> <li id="cite_note-16"><span class="mw-cite-backlink"><b><a href="#cite_ref-16">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://koss.com/collections/headsets-gaming-headphones">"Communication Headsets"</a>. <i>Koss Stereophones</i><span class="reference-accessdate">. Retrieved <span class="nowrap">8 February</span> 2023</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Koss+Stereophones&rft.atitle=Communication+Headsets&rft_id=https%3A%2F%2Fkoss.com%2Fcollections%2Fheadsets-gaming-headphones&rfr_id=info%3Asid%2Fen.wikipedia.org%3AKoss+Corporation" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Koss_Corporation&action=edit&section=4" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239549316">.mw-parser-output .refbegin{margin-bottom:0.5em}.mw-parser-output .refbegin-hanging-indents>ul{margin-left:0}.mw-parser-output .refbegin-hanging-indents>ul>li{margin-left:0;padding-left:3.2em;text-indent:-3.2em}.mw-parser-output .refbegin-hanging-indents ul,.mw-parser-output .refbegin-hanging-indents ul li{list-style:none}@media(max-width:720px){.mw-parser-output .refbegin-hanging-indents>ul>li{padding-left:1.6em;text-indent:-1.6em}}.mw-parser-output .refbegin-columns{margin-top:0.3em}.mw-parser-output .refbegin-columns ul{margin-top:0}.mw-parser-output .refbegin-columns li{page-break-inside:avoid;break-inside:avoid-column}@media screen{.mw-parser-output .refbegin{font-size:90%}}</style><div class="refbegin" style=""> <ul><li>Bednarek, David I., 'Koss Corp. May Be Suffering from Wall Street's Low Interest,' Milwaukee Journal, September 1, 1991.</li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation news cs1"><a rel="nofollow" class="external text" href="https://archive.org/details/sim_boston-phoenix_1981-05-26_10_21/page/n99/mode/1up">"Koss Effective: An Interview With the Man Who Gave Us Stereo Headphones"</a>. <i>The Boston Phoenix</i>. 26 May 1981<span class="reference-accessdate">. Retrieved <span class="nowrap">28 March</span> 2024</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+Boston+Phoenix&rft.atitle=Koss+Effective%3A+An+Interview+With+the+Man+Who+Gave+Us+Stereo+Headphones&rft.date=1981-05-26&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fsim_boston-phoenix_1981-05-26_10_21%2Fpage%2Fn99%2Fmode%2F1up&rfr_id=info%3Asid%2Fen.wikipedia.org%3AKoss+Corporation" class="Z3988"></span></li></ul> </div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Koss_Corporation&action=edit&section=5" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1266661725">.mw-parser-output .portalbox{padding:0;margin:0.5em 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