wikipedia skrev:Clément Ader demonstrated the first two-channel audio system in Paris in 1881, with a series of telephone transmitters connected from the stage of the Paris Opera to a suite of rooms at the Paris Electrical Exhibition, where listeners could hear a live transmission of performances through receivers for each ear. Scientific American reported,
"Every one who has been fortunate enough to hear the telephones at the Palais de l'Industrie has remarked that, in listening with both ears at the two telephones, the sound takes a special character of relief and localization which a single receiver cannot produce… This phenomenon is very curious, it approximates to the theory of binauricular audition, and has never been applied, we believe, before to produce this remarkable illusion to which may almost be given the name of auditive perspective."
This two-channel telephonic process was commercialized in France from 1890 to 1932 as the Théâtrophone, and in England from 1895 to 1925 as the Electrophone. Both were services available by coin-operated receivers at hotels and cafés, or by subscription to private homes.
http://en.wikipedia.org/wiki/Stereophonic_sound
Detta visar ju på en del väldigt intressanta saker, dels att vi faktiskt firar 130-årsjubileum gällande stereoåtergivning, sen också användes en föregångare till kabel-TV genom att abbonera på underhållning via kabel i hemmet.
Är det ngn som har tips på mer läsning om ur-stereo?