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Coaxial SPDIF cable?
bennetng
post Nov 25 2012, 15:19
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We were told only use 75 ohm cable for SPDIF purpose. So what is the impedance of typical analog RCA audio cable?

Another question is I have a 75 ohm TV antenna cable, is it suitable for SPDIF purpose?

Some people said that wrong impedance may not cause problem if the cable is short enough, if it is true, then what cable length will cause problem?

I ask these because I just made a SPDIF cable with two spare RCA plugs and a 75 ohm TV antenna cable (3 feet), I tested it using RMAA and found no problem (+- 0dB freq. response, -146dB noise level, 0% THD and so on) and I can't hear any problem as well. Does it mean that I don't need to spend money to buy a standard cable?

Thanks.
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washu
post Nov 25 2012, 19:03
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I've found SPDIF rather resilient when run over cables that are not to spec. I've got a 30' run that is made of a standard 1/8" phono jack extension cable (because it's what I had) with adapters on either end. The far end has a splitter to feed it into an old set of cambridge soundworks 4.1 speakers that needs separate inputs for the front and back pairs. A very hackish solution and definitely not in spec, but it works fine.
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- bennetng   Coaxial SPDIF cable?   Nov 25 2012, 15:19
- - Speedskater   a] The longer the cable the more important the 75 ...   Nov 25 2012, 17:41
|- - greynol   QUOTE (Speedskater @ Nov 25 2012, 08:41) ...   Nov 25 2012, 18:27
||- - Arnold B. Krueger   QUOTE (greynol @ Nov 25 2012, 12:27) QUOT...   Nov 26 2012, 02:53
||- - Soap   QUOTE (Arnold B. Krueger @ Nov 25 2012, 20...   Nov 26 2012, 03:00
||- - Arnold B. Krueger   QUOTE (Soap @ Nov 25 2012, 21:00) QUOTE (...   Nov 26 2012, 14:31
||- - Soap   FWIW the fraction of my interior wiring done by th...   Nov 26 2012, 14:37
|- - Soap   QUOTE (Speedskater @ Nov 25 2012, 11:41) ...   Nov 25 2012, 18:36
- - pdq   Analog audio cables may not be closely matched to ...   Nov 25 2012, 18:00
- - mzil   Besides the wire itself, the plug used on the end ...   Nov 25 2012, 18:14
|- - pdq   QUOTE (mzil @ Nov 25 2012, 12:14) F-pin a...   Nov 25 2012, 21:52
|- - mzil   Both exist: http://en.wikipedia.org/wiki/BNC_conn...   Nov 25 2012, 22:49
|- - bennetng   QUOTE RG6 and RG59 look the same in photos, but RG...   Nov 26 2012, 03:51
||- - mzil   Your cable is marked with a JIS (Japanese Industri...   Nov 26 2012, 05:40
|- - 2Bdecided   QUOTE (mzil @ Nov 25 2012, 21:49) Both ex...   Nov 26 2012, 13:52
- - Glenn Gundlach   QUOTE (bennetng @ Nov 25 2012, 06:19) We ...   Nov 25 2012, 18:17
- - bennetng   Thanks all. Although I don't have enough knowl...   Nov 25 2012, 18:45
- - washu   I've found SPDIF rather resilient when run ove...   Nov 25 2012, 19:03
|- - Arnold B. Krueger   QUOTE (washu @ Nov 25 2012, 13:03) I...   Nov 26 2012, 03:01
- - greynol   Are you sure your speakers aren't being fed by...   Nov 25 2012, 19:08
|- - washu   QUOTE (greynol @ Nov 25 2012, 13:08) Are ...   Nov 26 2012, 03:28
- - bennetng   Thanks mzil!   Nov 26 2012, 08:56
- - Dynamic   You should get away with a lot with S/PDIF because...   Nov 26 2012, 20:39


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