9/1/2023 0 Comments Pro 4![]() Note that these measurements become unreliable above 5kHz because of the effect of standing waves between the cups.īill Sommerwerck reviewed the Koss Pro/4 AAA Plus headphones in August 1991 (Vol.14 No.8): This is shown in comparison with (dotted lower line) the curve obtained under identical test conditions from the best-sounding headphones we have tested: The Stax SRX-I. Gordon Holtįig.2 Solid upper line: Measured frequency response of the Koss PR0-4X. Details were very well reproduced, and the sound was sharply focused, but as with most other phones, bass was quite thin. J. Some roughness was detected at the high end, but the phones otherwise appear to have a very neutral perspective, moving the sound only very slightly farther from the mikes than it originally was. The PRO-4 has a shade more bass and somewhat less brilliance than the HA-10. The PRO-4's sound was judged to be about midway in character between the new Sharpe HA-10 and the Jensen phones. Noise rejection is extremely high, but the PRO-4 is not quite as comfortable for long periods as the Sharpe HA-10 (because of a smaller ear cushion). The Koss is handsome, well constructed, and apparently quite durable. ![]() (Sharpe and Permoflux also provide facilities for attaching a lip-mike.) ![]() This, in case you've wondered, is a mounting for a "boom-type" lip microphone, for use in speech labs and for communication purposes. Almost a dead-ringer for the early-model Sharpe HA-10, Koss's PRO-4 ($45) is readily distinguishable by a large knurled protuberance sticking out of the lower part of the right-hand phone. ![]()
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