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In Reply to: RE: A-B testing? posted by dave slagle on May 19, 2015 at 08:46:39
Hi Dave,
we made comparisons with 40, 60 and 80 khz machines in a laboratory. We cut a shaded dog into 3 parts and checked the results with a professional microscope. The result? The part of the record cleaned with a 40 khz machine was o.k., but there was some visible dirt left. With the 60 khz machine nearly all of the dirt was gone. But the winner was the 80 khz machine, we couldn't see any dirt at all.
Unfortunately 80 khz machines are not that common and if you find one they are expensive.
Uwe from Belgium
Follow Ups:
Uwe,
Could it be that the 40 kHz machines simply need more time?
The ultrasonicrecords.com machine is 40 kHz.
Do you (or does anyone) know what the US speed is of the $4000 AudioDeske?
Mel
Mel,
in my experience the longer you clean a record ultrasonically the better the results are. But with the same time the higher frequency was better.
Uwe
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