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Re: Hey, John..

Hi Peter,

Actually I made a mistake on the distortion figure for –60-dB digital. It actually has 3rd harmonic distortion of nearly 0.4%. However, all distortion components fall below the noise floor of my system, which I estimate to be about –105-dB below full scale. The harmonic distortion components of a –60-dB, 1000-Hz sine wave fall at the following levels relative to 0-dB full scale.

2nd harmonic –118-dB
3rd harmonic –108-dB
4th harmonic –119-dB
5th harmonic –114-dB
6th harmonic –119-dB
7th harmonic –112-dB
8th harmonic –119-dB
9th harmonic –116-dB
10th harmonic –119-dB

Here is the Spectrum plot.




I will try to get some more plots done of vinyl signals. I believe the lowest level sine wave I can find on a test record is only about –20-dB relative 5-cm/s. Of course this would be about –40-dB below the highest recorded signals on records. Second harmonic distortion on this signal is –59-dB or 0.112%. Third and higher harmonics disappear into the vinyl noise floor. I hope to have a picture pretty soon.

Best regards,
John Elison


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