In 1970 Koss set the standard for full-size professional headphones with the legendary Pro/4AA. The Pro/4AA were regarded as the first dynamic headphones to deliver true full frequency and high-fidelity performance with superior noise isolation. #throwbackthursday #tbt #pro4aa | Koss
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Born in Milwaukee. Legendary Koss Headphones like the World’s first SP/3 Stereophone, ESP6, HV/1A, Pro4/AA, Porta Pro, KPH30i & Pro4S were all born in the city we call home - Milwaukee, WI USA. | Koss
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