Digital coax cable....

[SWL3600]

I have an RCA to XLR cable that is a 75 ohm cable. I sometimes use it as a digital coax cable and it works fine but is 75 ohms enough?

Should it be more like 110 ohms....or don't worry about it?

Thanks!

 

[Chip Chester]

The longer the cable, the more important impedance is. Even paperclips can work fine if you use just one.
Is this a pro AES-EBU digital connection? Incorporating RCA? Maybe I'm not up-to-speed...

Chip

 

[whoaru99]

Type II S/PDIF calls for 75 ohms characteristic impedance

Type I AES/EBU calls for 110.

There is no spec for a half-breed. LOL. If what you have works there probably isn't any need to fix it.

 

[SWL3600]

Thanks dudes

 

[cpt_paranoia]

Type II S/PDIF calls for 75 ohms characteristic impedance

Type I AES/EBU calls for 110.

There is no spec for a half-breed. LOL. If what you have works there probably isn't any need to fix it.

The proper answer would be an impedance-matching transformer...

 

[whoaru99]

Indeed.

An even more proper answer would also incude a caveat that regardless of impedance matching, S/PDIF is different that AES3.

In most cases of S/PDIF to AES3 it will work regardless of just a cable or with transformer. Regardless of either, it is still a technically flawed adaptation due to the subcode difference which is not addressed by cable nor by transformer. All going back to the point about if it works...