The Genesis Of Vinyl Stereo Record
Already in 1954 high requirements for audio reproduction were discussed in the USA for improving the existing High Fidelity standard:
The Radio Designer's Handbook (Langford- Smith) was referring to a frequency response of 30 Hz to 20 kHz at a linearity required ± 0,1 dB! For this ambitious aim to better performance, the distortion factor was proposed to be less than 0.5 % (THD) at an S/N ratio of 62 dB.
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