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In Reply to: RE: It is just a matter of magnitude.... posted by Penguin on October 24, 2016 at 18:38:51
Does tonearm resonance amplify the bearing noise? At what frequency does groove noise appear?
Found this one done by Thorens
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Ask the question...Does it matter?. Say groove noise is at -60db, the total noise of the table is -72db....what is the cumulative noise? i would venture to day that it is not more than -59.9 db, a minute addition form the the low level noise of the table itself. Since both bearing and grove noise is caused by friction, they would have similar character, as opposed to noise from EM fields of sorts. If you look at User510's measurements you see more of an amplitude change in certain spectra as opposed to the shift of the entire spectrum. Think about it this way. A piece of sandpaper will make different scratching sound on wood, steel, glass etc. but will you hear that on a train with the windows open?
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
You're right it doesn't matter. Noise is noise. I was curious. just wanting to identify what I see.
With my arm and cartridge, the tonearm resonance should be about 10 hz. I guess the bearing noise is in the same area. Groove noise?? spread over a wider part of the spectrum?
Recorded from AP test record silent groove, 64 db gain setting on Sutherland.
Since I record all of my LPs, I can fix it with a high pass filter at 20 hz. Then it looks like this.
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