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Old 8th August 2009, 01:13 AM   #71
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All that said, which factors affect SPDIF digital cable quality?

1. impedance?
2. connectors?
3. lenght?
4. conductor material?
5. ???

I've read that copper clad steel -now frequently used in coaxial cables- is affected by skin effect as signal travel on copper wire surface avoiding steel center wire. Is skin effect a problem also for digital transmission?

Found elsewhere on the net someone talking about unshielded digital cables based on same old cat5 (wrong impedance, I know, but he looks so happy that I wonder if...). He's quoting a 'less is more' approch by 47 Lab (Ota cables).
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Old 8th August 2009, 01:34 PM   #72
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Quote:
Originally posted by DragonMaster


There's diodes, or what? (Let's make you remember that wires are made out of a big stack of purified cooper, and there's no direction in that thing)
since you are transferring energy from source to DAC, there IS a direction

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Old 5th April 2017, 07:46 PM   #73
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When we get zero-loss cables and interfaces there will be no directionality to debate.
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Old 5th April 2017, 08:07 PM   #74
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Most of this thread is thirteen years old!
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Old 5th April 2017, 08:19 PM   #75
MINUX75 is offline MINUX75  France
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1) a minimum lenght
2) a minimum picoFarad between the two wires
3) a minimum contact. Beware contacts hiden, Inside connectors.
4) a minimum noise aroud the cable. (smps)

to reduce capacity between the two wires i prefer unshield cāble.
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Old 5th April 2017, 08:34 PM   #76
Gusser is offline Gusser  United States
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SPDIF is the same bandwidth as an NTSC analog video signal. Therefore the engineers who developed the SPDIF standard utilized the same electrical interface. Up to 1 volt at 75ohms.

So just use a 75ohm video cable. It's really that simple. For short distances under 6 feet, even a cheap audio cable will work most times.

People without technical backgrounds seem to get all worked up over SPDIF cables. It's very simple. Just use what was intended and skip the audiophile magazine dribble.
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Old 6th April 2017, 10:04 AM   #77
DF96 is online now DF96  England
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Quote:
Originally Posted by MINUX75
1) a minimum lenght
2) a minimum picoFarad between the two wires
3) a minimum contact. Beware contacts hiden, Inside connectors.
4) a minimum noise aroud the cable. (smps)

to reduce capacity between the two wires i prefer unshield cāble.
Five items of advice; all unhelpful, some seriously so.

1) length does not matter, if the right cable is used
2) it is vital that the capacitance is not minimised, as the cable must be 75 ohm characteristic impedance
3) any reasonable contact material will do
4) if reasonably good cable is used then external interference will not be a problem, as SPDIF is quite robust

Unshielded cable is not 75 ohm coax so is definitely the wrong cable which in the worst case will lead to data errors, but even in better cases will increase jitter.

Quote:
Originally Posted by Gusser
People without technical backgrounds seem to get all worked up over SPDIF cables.
People feel the need to 'improve' their systems. For those who don't understand circuits and can't solder, swapping cables is about the only thing they can do so they convince each other that this is a worthwhile way to pass the time.

Last edited by DF96; 6th April 2017 at 10:04 AM. Reason: typo
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Old 8th April 2017, 01:15 AM   #78
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I built Thorsten Loesch's X-1.5 interconnects, a trust me, they sound lean and 'right'.
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Old 8th April 2017, 09:26 AM   #79
DF96 is online now DF96  England
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That cable (intended as an analogue interconnect) happens to have about the right characteristic impedance for SPDIF, but it appears to be an unshielded twisted pair so quite unsuitable for any unbalanced connection whether analogue or digital. You may be lucky and not seriously degrade the signal, or you may suffer interference (or radiate it).

The fact that bad cables (no matter how expensive or carefully DIYed) can work for SPDIF shows how well-engineered SPDIF is, and also shows how unnecessary it is to use expensive or DIY cables.
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