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Hello
this subject has many threads previously BUT all with differing answers.
I need info on how to wire the shielding from the cable within the 5 pin din for a fully balanced cable - I THINK I LEAVE IT DISCONNECTED "FLOATING" -but can anyone confirm this ??
At the XLR end pin 1 – ground (shielding) / pin 2 non inverting positive / pin 3 inverting negative
At the din end do I leave the shielding disconnected OR do I connect it to the inverting negative .?
I have done this previously with my old SME V and I was sure the shielding was only connected at the XLR end – but now I have my doubts and I no longer have it to compare to.
Hope someone can help .
Thanks in advance
Follow Ups:
You can go to www.aqvox.de, and download the user's manual of the 2CI, it details the cable layout for balanced phone cables.
You should connect the shield to the XLR connector end and let it float over the DIN end. Neutrik XLR connectors have a forth connector for shield use. That keeps the audio ground separate from the shield/chassis ground at multiple points. Certainly the shield will be connected to a common ground with the audio at some point. It allows the shield to be connected to the chassis of the preamp and only joined at the audio ground point chosen by the preamps designer. I think that it's a good idea to let the guy that laid out the phono circuit choose the ground path rather than the guy asking questions about connecting it ;-).Mark is correct. You never want to connect the inverted signal to ground. The only exception that I see here to connecting the shield to a fourth, isolated shield pin is when you have a cable that has only three wires and so the shield is also the ground. Then Pin 1 serves ground/shield duty for that cable assembly.
-Bill
The shield gets connected to pin#1 on the XLR end and to the ground or center pin on the DIN connector. Looking from the top of the DIN it would be R+, R- Grd, L-, L+ from left to right. Hope this helps.
If you connect ground to the inverting negative you are shorting one half of the input to the balanced stage.What you actually do with it would depend on the ground connection to the turntable.
The simplest rule is to remember that each component of the chain needs to have precisely one pathway to earth.
thanks for the good advise.
what i will do is measure for continuity pin 1 on the xlr input socket on the phono amp to the earth / grounding tag on the phono amp . If it reads zero ohms (aprox) then they are connected internally. If i get a high resistance they certainly shouldn't be connected.
thanks all
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