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Why lower?

Posted by Tre' (P) on May 29, 2017 at 17:35:01

In Reply to: RE: target arm/cartridge resonance when playing 78s? posted by Crazy Dave on May 28, 2017 at 07:11:20:

Why lower?

With the record spinning at 78 RPM, wouldn't the warp tones be higher and need a higher resonant frequency as to not get excited by those warp tones?

As I understand it, a 33.3 RPM record has warp tones at a max of 5Hz and the lowest frequency cut in the groove of 20Hz.

Having the arm/cartridge resonance set to 10Hz means that that resonance is one octave away from (above) the 5Hz warp tones and one octave away from (below) the 20Hz music in the groove so that neither will set off the 10Hz resonance of the system.

With the record spinning at 78 RPM I calculate, for the same warp, the warp tone would be 11.7Hz. (78 / 33.3 = 2.34 5Hz X 2.34 = 11.7Hz)

If the arm/cartridge resonance were set to 23.4Hz the it would be one octave away from those warp tones.

If there is no music lower than 46.8Hz cut into the groove then the arm/cartridge resonance would be at least an octave away from that.

Am I thinking about this wrong?

Thanks.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

Edits: 05/29/17

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