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In Reply to: Experiment posted by airtime on September 17, 2017 at 15:11:48:
> > I don't care for high end low cap cables. Use cheap cables. Those are usually higher impedance. < <Not that it matters for sound quality, but the "impedance" of a cable refers to its characteristic impedance - which in theory only matters when the cable is an appreciable fraction of the wavelength it is carrying. For audio, this only ever happened in the days when telephone signals were still analog and they had to be transmitted many miles to the next repeater station. (By the way the characteristic impedance of those old telegraph/telephone cables was 600 ohms, which is why it is still used as a standard in certain measurements.)
Increasing the capacitance actually lowers the characteristic impedance of a cable. Although I agree with your conclusion. To experiment get some fine wires and some RCA plugs and make some unshielded cables. If used between a high-level source and a preamp and they are less than 2' or so long, they won't pick up a meaningful amount of hum.
First listen to them with the wires straight and parallel, say and inch or so apart. This will give a very low capacitance. Then simply twist the wires together (about 1 turn per inch) so that the wires are in physical contact for the bulk of their length. Now it will have much, much higher capacitance, but in my experience, better sound as well. The characteristic impedance of a twisted pair depends on the geometry of the cables, but the most important factor is the distance between them. A twisted pair of typical wiring used for audio purposes will have a characteristic impedance of about 110 ohms - hence the standard for AES/EBU cables, which use twisted pair wiring.
Cheers!
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- RE: Slight correction - Charles Hansen 09/17/1720:12:53 09/17/17 (0)
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