Propeller Head Plaza

Technical and scientific discussion of amps, cables and other topics.

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RE: -75 dB

Posted by tomservo on June 25, 2014 at 13:23:21:
Hi Tony

Cool, somebody looked!
With a null -75dB down and IF the spectrum you heard was that of the recording, for a signal cable like these, if driving a 5K load, a difference of about 7 Ohms in series R would do it.

If this were a speaker cable, that much difference could be the result of one cable having about 1/1000 of one Ohm more resistance than the other.
(Assuming an average load Z of 6 Ohms).

If the null had more high end, that would be from one having a little more series L than the other or signal cable, parallel C. Any form of non-linearity would be a "difference" and be most audible (like when you use this on electronics etc).

“I would have to see an indication of repeatability (multiple tests with a given cable, with and without disconnecting and reconnecting and done in a random order by cable) before I would attribute any differences to the cables themselves and not some other aspect of the experiment. It's all too easy to conduct experiments that one believes to be measuring one thing only to discover one was actually measuring something else.”

Sad but true and same for the -138dB.
Best,
Tom