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Ultimate Audio Playback / Cables (Community induced) / Re: Cables with BNC Connectors/Adapters Are Generating A Superoir SQ
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on: September 13, 2014, 10:13:49 pm
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Again from that PDF on the top it mentions something about steel on top, but the details it mentions the inner conductor is silver-copper. 'silver-coated copper-clad steel wire' Hi, the above is the correct term. (see ASTM B 452-09, for electronic applications) ------------------------ I went through all technical datas of the Huber+Suhner cable families, and the ENVIROFLEX and K - types are covering our application best. When I have a look to the attenuation diagrams (see above from nik.d), and see where the audio frequency is working, the curves of the cables are not that far apart. The capacitance of both families is nearly the same (94pF/m & 96pF/m). I think it will not a big mistake if we stick to the K_02252_D. My proposal: If somebody wants to climb to the top he may test the K_02252_D60 and write his experience. When we have a look to the weight and the diameter of the conductor of the cables, the _D60 is ......... . Joachim
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Ultimate Audio Playback / Cables (Community induced) / Re: Cables with BNC Connectors/Adapters Are Generating A Superoir SQ
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on: September 11, 2014, 09:31:06 am
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BTW this is the 'impedance mismatch' Joachim pointed out in his last post, Btw, "impedance matching" does not exist. Hi Peter, all this are "keywords" for a search within BING or Google. They were discussing this theme in the forums of CA + Audiogon too. Joachim EDIT: If we are looking for a problem in the internet with keywords, we get thousands of informations, and 99,9% are not covering our search. So we have to filter, and we will find in one article a paragraph or sentence for our problem only, and this goes on and on and on and in the end the “puzzle” is completed.
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Ultimate Audio Playback / Cables (Community induced) / Re: Cables with BNC Connectors/Adapters Are Generating A Superoir SQ
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on: September 10, 2014, 06:20:37 pm
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-Quote- Characteristic ImpedanceCharacteristic impedance is a high-frequency phenomenon that is a function of the "distributed" R, L and C (inductance and capacitance per unit length). Characteristic impedance Z0 is calculated as (Lu/Cu)1/2 . Lu and Cu are inductance and capacitance per unit length. From the Z0 equation, you can see that Z0 is independent of the length of the cable, the frequency and the resistance. This behavior holds true only if the wavelength of the frequencies on the cable is much shorter than the transit time of a signal from one end of the cable to the other. When this is true, the characteristic impedance will stay relatively constant regardless of the length of the cable and the cable will exhibit "transmission-line-effects". In general, if an event is so fast that it completes a significant voltage transition before it is noticed at the far end of the cable, this will cause transmission-line-effects to occur. Transit times are very short for typical audio cables. For example, a 20 foot speaker cable has a transit time of around 40 nanoseconds. In order for transmission-line-effects to occur on this cable, signals at frequencies above 25MHz must be present. This is orders of magnitude higher than audio frequencies. Therefore, transmission-line-effects and characteristic impedance are definitely second-order effects on audio cables, however resonance may play more significant part than previously imagined and this relates to termination of the characteristic impedance. -Unquote- Original text see here: http://www.empiricalaudio.com/computer-audio/audio-faqs/should-i-match-impedances
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