It was tried to make a quick demo of the song Πως Θα Ηταν, with male voice and glockenspiel.
Signal path:
Sony F-96 omni mc mic - Sony ECM-280 cassette recorder - TDK SA60 - Sanyo MR-410 (playback)
It sounds very bass heavy and dull. There is almost nothing wrong with the recorder or playback cassette player.
The possible fault is that Fletcher Munson curves and voice effect curves had not been compensated.
An earlier recording made with Sanyo MR-410 fed by the Pleiades T1 K117 booster mic preamp fed by a modified Jensen input transformer sounds not dull but bright and lively. The Jensen mod is removing many laminations so the primary inductance falls and also reducing the number of primary turns for the same reason. So there is low cut in the attempt to approach flat frequency response from singer's vocal chords to listener's brain [Hilliard].
A Pleiades (R,L) filter should have been used in today's demo for a gentle slope high pass towards above objective.
After all it is not a fault of cassettes, dynamic mics. etc. It is just that psychoacoustics, psychophysics must be respected.
On this post there is the same reference:
https://euroelectron.blogspot.com/2019/06/equal-loudness-curves-voice-effort.html
Reference:
http://www.aes.org/aeshc/pdf/hilliard_a-brief-history-of-early-motion-picture-sound.pdf
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