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In Reply to: balanced (XLR) digital vs. analog cables posted by tantra on March 19, 2007 at 07:19:03:
The AES/EBU digital interface specs out a 110 ohm impedence (with I believe a +/- 15% tolerance). XLR analog cables will be all over the map with measured impedence. While the analog XLR cable > may < work, it is most likely not optimized for digital, and will likely be inferior to a purpose-built AES/EBU cable, IMHO...
Follow Ups:
that's why the spec. was written specifying 110 ohm.In most cases there is NO difference.
A quick search from one manufacturer yielded some examples of microphone/musical instrument cable used to make XLR cables:Belden 8412: 52 ohms
Belden 8402: 52 ohms
Belden 8408: 59 ohms
Belden 8422: 90 ohms
Belden 8428: 50 ohms
Belden 9397: 47 ohms
Belden 9399: 55 ohms
Belden 9452: 56 ohmsYes, some analog XLR cables might be 110 ohm, but > I < sure wouldn't bet on it...
My quick glance at Belden shows most to NOT be 110 ohm,
the only one at a quick glance that IS 110 ohms is Belden 1800A
which is spec'd as an AES/EBU cable.I have used 110 ohm cable for audio signal before in a pinch-
I have also used non-110 ohm cable for AES/EBU, but it shows
more errors most likely due to standing waves in the interface
of the wire between transmit and receive.Of course the differences are minimal- as in video where 75 ohm
coax is king, they used 50 ohm coax for computer network connections
for years (remember when it had to be in 1 meter lengths in order to reduce
standing waves and improve data rate?). But did you know that
until about 10 years ago all BNC's were 75 ohm? That will really dick
up a 50 ohm characteristic network cable. Yes it works, the
center pin will conduct and the shield will conduct. It's just in
the details where the differences lie. A 50 ohm network cable will
squirt video out the other end, even if it works better at 75 ohm.
A coat hanger will make a connection. Just not a good one, and good ones
are where we try and eek out that last 5% of performance in audio.
RFG
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