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发表于 2014-1-27 11:11:50
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Koss started making headphones in 1958 with SP-3 stereophone being the first headphone they made. In 1968 Koss introduced ESP/6, one of the first electrostatic stereophones in production. ESP/6 were an unusual design for an electrostatic headphone because it utilized step-up transformers inside earcups. ESP/6 were also terminated in regular TRS plug, but included an adapter that allowed them to be hooked-up to the amplifier or receiver speaker-outs.
高斯第一部58年的sp-3
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