45 to 78
All that said, one still needs to use one's ears. Despite the
"official" numbers, I find that (for example) turnover frequencies of
50Hz, 500Hz and 3180Hz sound excellent on many electrical US
Columbias. The extra octave of bass boost and the extra extension
of treble response may be compensating for losses in the system --
whatever, they sound good to my ears.
With a playback pole at 50Hz, there will 6dB /less/ overall boost during
playback than with a 100Hz pole. I think.
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