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[ARSCLIST] 1937 shellac test pressing outperforms audio CD
I apologize in advance for cross posting.
I couldn't help sharing this - I am regularly measuring 27.2 kHz
harmonics and occasionally as high as 43.6 kHz harmonics (violin)
from a series of 1937 RCA Victor test pressings - nearly 72 years
old. I'm pretty fastidious about accurate cartridge loading, so
I don't think we're seeing ringing of the transducer.
Never mind that we've invested nearly $60k in our analog disc
playback and digitization system, pushing the limits of what is
possible, but I was astounded by the recording quality and
performance of these particular discs that long preceeded modern
formats like magnetic tape and LP, let alone CD.
For those who have the ability to measure this sort of thing,
I can email 1-second and 2-second samples (24/96 WAVE files).
For those that do not have access to a high-resolution spectrogram,
I can send jpegs taken from ours. The WAVE files altogether are
2.3 MB - not especially large - but you should still make sure
that your email software and internet connection can handle email
of this size.
The Audio Archive, Inc.
Disc and Tape Audio Transfer Services and Preservation Consulting