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RIAAA question often asked on audio fora is “I connected a turntable to my amp. I have to turn up the volume substantially and if I do it sounds horrible. What am I doing wrong?”
The output of a cartridge is very low. You need an additional amp to bring it to line level.
RIAA curve for recording and playback[1]
RIAA was implemented as a standard around 1954. ImplementationThe RIAA is part of a phono stage in an phono amp.
Stanley Lipshitz put a cat among the pigeons in the June 1979 issue of the Journal of the Audio Engineering Society with an unprecedentedly detailed examination of the circuits used to apply RIAA/IEC deemphasis. He concluded that many of these were in error as a result of incorrect design equations being applied, or because the effects of other time constants in the circuit, and/or the influence of amplifier loop gain, were ignored. The corollary was another round in the nascent objectivist/subjectivist struggle in which it was claimed that many of the disparities heard between different amplifiers were due to nothing more exotic than significant departures from flat frequency response. Source: Stereophile [2] Vinyl rippingWhat the hell has vinyl to do on a side dedicated to computer audio?
References
© Vincent Kars
August 22, 2020
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