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Critic's Corner Discuss a review. Provide constructive feedback. Talk to the industry. |
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In Reply to: AFAIK, I was the first high-end audio journalist to write about Plangent Processes posted by John Marks on August 12, 2022 at 17:04:25:
I think one of the issues that improper azimuth creates is phase shift between channels. Some of that can be fixed after the fact."What is azimuth? It is simply the angle of the recording or reproducing head gap relative to the motion of tape travel. It should be perpendicular. 90 degrees. 90.000 degrees. But there are limits to the accuracy of even the best test tapes. And there are limits to the operator's ability to adjust the machine. And the machine is subject to vibration and shock in its life. Here is an excellent paper by Jay McKnight of Magnetic Reference Lab about how they do azimuth and the limitations. Figure 6 of this MRL paper shows the frequency response when the azimuth is varied from optimum. What happens is that there is a combing effect and that can not fully be removed by re-equalizing after the transfer. Therefore, despite hardware and software "azimuth correctors" that are available, it is best to align the playback azimuth as best you can prior to transferring the tape - and do it with program."
Tre'
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Edits: 08/12/22
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- RE: AFAIK, I was the first high-end audio journalist to write about Plangent Processes - Tre' 17:33:15 08/12/22 (0)
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