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In Reply to: 1mm penetration is a 1D model posted by Mart on October 9, 2001 at 11:34:36:
Even if we factor in a dielectric like polypropylene with a relative permittivity of 2.5, the skin depth is still an inconsequential 0.3 mm. Deeper penetration is preferred. What this result tells us is that most speaker cable strands would have sufficient skin depth to ensure full penetration thru the skin surface to avoid the skin effect when the cable construction does not involve magnetic materials. My main point was: skin depth resistance, no matter how inconsequential, can still be accounted for in the lumped-circuit (RLC) model. The transmission line model is neither necessary nor appropriate for loudspeaker cables.As a general rule, if the cable length is less than one tenth of the wave length at the frequency of concern, then it is for certain not a transmission line.
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Follow Ups
- Re: Skin depth - Monk1 14:04:04 10/09/01 (3)
- Re: Skin depth - Mart 14:55:10 10/09/01 (2)
- Re: Transmission lines - Monk1 15:42:42 10/09/01 (1)
- just substituted a long cable length - Mart 00:42:58 10/23/01 (0)
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