You can measure this with a Time Domain Reflectometer

Posted by Tony Lauck (A) on March 7, 2016 at 10:42:40

In Reply to: RE: Thanks! I think I found a better link, though.... posted by John Elison on March 6, 2016 at 19:50:26:

if you care.

It's not uncommon for DACs to use the wrong impedance connector, the wrong impedance cable to the PC board, the wrong impedance trace on the PC board, etc... Thus being paranoid about the connector may be irrelevant. Also, so long as there are no actual data errors due to impedance mismatches (unlikely with normal length cables) any effects on the sound quality will depend on the buffering and clock logic downstream of the receiver circuitry and will be second order effects.

A mismatch at the DAC end will cause a reflection that goes back to the source. It will have little or no effect on the DAC if the source end is properly terminated (no mismatch). If the source end isn't properly terminated the reflection will be reflected back to the DAC. Depending on the length of the cable this may (or may not) affect the signal the DAC decodes.

TL;DR. What you hear will be system dependent.

Tony Lauck

"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar

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Follow Ups Full Thread

Topic - AES/EBU digital 110 ohm characteristic impedance - Duster 18:40:57 03/3/16 (19)

RE: AES/EBU digital 110 ohm characteristic impedance - Thorsten 19:38:09 03/9/16 (3)

RE: AES/EBU digital 110 ohm characteristic impedance - noway 06:48:19 03/24/16 (1)

RE: AES/EBU digital 110 ohm characteristic impedance - Thorsten 06:57:23 03/25/16 (0)

RE: AES/EBU digital 110 ohm characteristic impedance - 91derlust 12:57:29 03/21/16 (0)

RE: "...one might think that a rather strict tolerance is required..." - genungo 00:51:05 03/7/16 (0)

What I have been told is... - John Marks 19:05:25 03/3/16 (13)

Let's be careful going forward... - Chris Garrett 22:11:52 03/6/16 (0)

RE: What I have been told is... - PAR 16:26:47 03/4/16 (1)

I agree with many of your points--especially what happens behind the back panels. - John Marks 16:40:26 03/4/16 (0)

RE: What I have been told is... - John Elison 19:40:28 03/3/16 (9)

I am running out the door. - John Marks 13:04:59 03/4/16 (8)

Thanks! I think I found a better link, though.... - John Elison 13:57:07 03/4/16 (7)

RE: Thanks! I think I found a better link, though.... - flood2 18:57:32 03/6/16 (5)

RE: Thanks! I think I found a better link, though.... - John Elison 19:50:26 03/6/16 (4)

You can measure this with a Time Domain Reflectometer - Tony Lauck 03/7/1610:42:40 03/7/16 (2)

RE: You can measure this with a Time Domain Reflectometer - John Elison 22:18:08 03/7/16 (1)

RE: You can measure this with a Time Domain Reflectometer - flood2 14:59:42 03/8/16 (0)

You're welcome.. - flood2 20:25:19 03/6/16 (0)

That's what the math looks like! - John Marks 16:31:35 03/4/16 (0)

Follow Ups

You can measure this with a Time Domain Reflectometer - Tony Lauck 03/7/1610:42:40 03/7/16 (2)

RE: You can measure this with a Time Domain Reflectometer - John Elison 22:18:08 03/7/16 (1)

RE: You can measure this with a Time Domain Reflectometer - flood2 14:59:42 03/8/16 (0)

You can measure this with a Time Domain Reflectometer

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