I have used them for years and the porta pro have best sound for what i use them for.
Review by Fern /
(Posted on 2/16/2016)
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The Original American Stereophone Company
Ever since we invented the first SP/3 stereophone back in 1958, Koss Stereophones have been bringing back the excitement of a live performance. Music lovers around the world recognize that dedication to accuracy in sound reproduction as The Sound of Koss.