Editing Loudspeaker (section)

====Magnetostrictive speakers====
Magnetostrictive transducers, based on [[magnetostriction]], have been predominantly used as [[sonar]] ultrasonic sound wave radiators, but their use has spread also to audio speaker systems. Magnetostrictive speaker drivers have some special advantages: they can provide greater force (with smaller excursions) than other technologies; low excursion can avoid distortions from large excursion as in other designs; the magnetizing coil is stationary and therefore more easily cooled; they are robust because delicate suspensions and voice coils are not required. Magnetostrictive speaker modules have been produced by Fostex<ref>{{cite web|first=Takeyoshi |last=Yamada |title=Fostex Prototypes Tabletop Vibration Speaker System Using Super Magnetostrictor |url=http://techon.nikkeibp.co.jp/english/NEWS_EN/20051117/110823/ |publisher=Tech-On! |date=November 2005 |quote=The cone-shaped speaker system is 95 mm in diameter and 90 mm high. It features an actuator using a magnetostrictor that extends and shrinks in line with magnetic field changes. The actuator converts input sound into the vibration and conveys it to the tabletop thus rendering sound. |access-date=October 5, 2009 |ref=Fostex1 }}</ref><ref>{{cite web |first=Hirofumi |last=Onohara |title=(WO/2006/118205) Giant-Magnetostrictive Speaker |url=http://www.wipo.int/pctdb/en/wo.jsp?wo=2006118205 |archive-url=https://archive.today/20120805230459/http://www.wipo.int/pctdb/en/wo.jsp?wo=2006118205 |archive-date=August 5, 2012 |publisher=World Intellectual Property Organization |date=November 2006 |access-date=October 5, 2009 |quote=A giant-magnetostrictive speaker exhibiting good acoustic characteristics when it is used while being placed on a horizontal surface. |ref=Fostex2}}</ref><ref>{{Cite patent |country=JP |number=WO/2006/118205 }}</ref> and [[FeONIC]]<ref>{{cite web|url=http://media.feonic.com/downloads/specs/Retail_Whispering_Windows_-_FeONIC_F1.pdf|archive-url=https://www.webcitation.org/5nhuXaouq?url=http://media.feonic.com/downloads/specs/Retail_Whispering_Windows_-_FeONIC_F1.pdf |archive-date=February 21, 2010 |title=Whispering Windows |publisher=FeONIC |access-date=October 5, 2009 |ref=feonicf1 }}</ref><ref>{{cite web|title=FeONIC D2 Audio Drive |url=http://media.feonic.com/downloads/specs/D2SpecsheetNov2008.pdf |archive-url=https://web.archive.org/web/20091229011920/http://media.feonic.com/downloads/specs/D2SpecsheetNov2008.pdf |archive-date=December 29, 2009 |publisher=FeONIC |page=1 |access-date=October 5, 2009 |quote=The D2 is unlike traditional speaker technology because it uses a very high powered magnetostrictive smart material as the driver instead of a moving coil. The material was originally developed by the US military for sonar applications and is now de-restricted for commercial use. |ref=feonicd2}}</ref><ref>{{cite web |first=Florin |last=Tibu |title=Terfenol-D: No Speakers = Great Sound! |date=February 26, 2008 |url=http://news.softpedia.com/news/Terfenol-D-No-Speakers-Great-Sound-79569.shtml |publisher=Softpedia |access-date=October 5, 2009 |ref=Softpedia |archive-date=September 17, 2011 |archive-url=https://web.archive.org/web/20110917201318/http://news.softpedia.com/news/Terfenol-D-No-Speakers-Great-Sound-79569.shtml }}</ref><ref>{{cite web |title=MINDCo launches FeONIC Invisible & Green audio |url=http://news.ezw.com/News.aspx?newsID=15 |publisher=Economic Zones World |date=January 2010 |ref=MINDCo |access-date=January 19, 2010 |archive-url=https://web.archive.org/web/20110710215008/http://news.ezw.com/News.aspx?newsID=15 |archive-date=July 10, 2011 }}</ref> and subwoofer drivers have also been produced.<ref>{{cite web |title=FeONIC S–Drive Bass Sounder |url=http://media.feonic.com/downloads/specs/SDriveSpecsheetNov2008.pdf |archive-url=https://www.webcitation.org/5nhuXaqk0?url=http://media.feonic.com/downloads/specs/SDriveSpecsheetNov2008.pdf |archive-date=February 21, 2010 |publisher=FeONIC |date=November 2008 |access-date=October 5, 2009 |ref=feonicsub }}</ref>