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In Reply to: RE: Peer Check for DIY Balanced XLR I/C's posted by reagan on March 05, 2021 at 03:44:48
Truly balanced cables, in fact most cables, do not require shielding of any sort, floating or otherwise.
I have built lots of balanced cables, with the ground twisted opposite on the outside of twisted signal wires, and with the ground through the center but spaced away from twisted signal wires. Couldn't hear a difference.
berate is 8 and benign is 9
Per Jon Risch...
For XLR to XLR, twisted pairs should be constructed like this:
pin 2 to pin 2, pin 3 to pin 3 for the twisted pair wires, THEN, the shield to pin 1 of the source component. This SHOULD work for true balanced gear, but some is not true balanced, and a ground reference connection must be made, in this case, wrap a 16 gauge tinned stranded hookup wire around the OUTSIDE of the shield braid, and connect to pin 1 at both ends. This will help keep any ground currents from interfering with the two differential pairs, and minimize cable capacitance.
You have the right idea, and with the XLR/balanced cables, I have had very positive feedback from folks who have built these per my instructions.
Many express amazement that this simple change to the cable geometry would have the effect that it does, namely provide a dead black (silent and uncolored) background to the music, which springs forth cleanly and without undue emphasis, with very realistic transient behavior, most noticeable on acoustic guitars, strings,and cymbal crashes.
With out the ground wire that tends to carry the interchassis potential difference currents being in very close proximity to the two signal carrying wires, and even shielded from them,there is much less noise injection, and less distortion of the EM fields of the signal wires.
Balanced cable theories are great for the text books, but seldom are twisted pairs perfectly balanced electrically, and so, you need all the help you can get in the real world.
Thank you. Hopefully the Neutrik connectors will stretch over the layers.
I am planning on using 3/8" untinned Cu braid. It will need to be expanded but hopefully will get the coverage needed.
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