See: Ampex Master Equalisation - Ampex Service Bulletin No. 15
It is causally mentioned. "From a noise standpoint 15ips is the worst speed possible: 7.5ips or 30ips original tape should be quieter, but has of course, the usual limitations of frequency response on one hand and playing time on the other"
The Ampex bulletin refers to subjective noise are the ear brain is most sensitive at 2KHz to 6KHz, see equal loudness curves by Fletcher Munson.
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