alp
Rank: Trio
Posts: 160
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Post by alp on Nov 15, 2019 21:37:15 GMT
A few years ago, after buying a Allo Digione for my RPi3, because Allo claimed jitter is lower with BNC, I purchased a 0.5m Van Damme 75 ohm cable terminated with a BNC connector at one end for the Digione. Later I read in a thread on AOS that suggested longer coax cables are better (1.5m) so I dutifully purchased a Belden coax cable and until recently have used that without noticing a difference. Fast forward a couple of years... After experimenting with USB from a RPI4 which seems to be very cable sensitive, I wondered if the same was true for SPDIF. I dug out my 0.5m cable and wow.. all the good things that I had heard with RPi4/USB were there plus the treble that was missing.
Does coax cable length really make a difference, or is it the cable or the BNC connector?
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Post by MartinT on Nov 15, 2019 21:47:04 GMT
I found Belden to not sound very good. I think this has more influence than length, although 1.5m is quoted as ideal.
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Post by John on Nov 16, 2019 4:31:08 GMT
My experience is that the quality of the cable is quite important hers IIf you wish I can lend you my Coherent Coax cable for you to try out for a few weeks to see if this helps you.
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alp
Rank: Trio
Posts: 160
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Post by alp on Nov 17, 2019 13:30:28 GMT
Hi John, that's very generous of you but the coherent is way out of my price range, costing more than my DAC and streamer combined. For £150 or so, I have ordered a 1.5m length of the Van Damme cable I have already so I can make a direct like-for-like comparison of the two lengths.
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Post by MartinT on Nov 17, 2019 14:22:48 GMT
For less than £100 you could look for a used Black Cat Silverstar which is the best co-ax S/PDIF cable I've used.
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Post by speedysteve on Nov 17, 2019 17:01:11 GMT
1.5m is optimal I believe. Something about reflections if shorter.
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Post by MartinT on Nov 17, 2019 18:37:41 GMT
I think Stratmangler has the low-down on it, and yes I think it is related to reflections. |
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alp
Rank: Trio
Posts: 160
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Post by alp on Nov 17, 2019 19:09:00 GMT
Yes, that is also what I remember.
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Deleted
Deleted Member
Posts: 0
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Post by Deleted on Nov 17, 2019 20:50:54 GMT
I am happy to measure any digital cable full measurements not just reflections
I also do not subscribe to 1.5m length for either digital or mains cables
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