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Topic: Question about trs to dual xlr Y cable |
Scott Denniston
From:
Hahns Peak, Colorado, USA
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Posted 24 Jun 2018 10:17 am |
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| I know they make Y cables like this. I'm wondering if either or both sides of the Y would be robbed of any signal strength or anything. One side would be going to my powered monitor and the other to the PA board. |
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Georg Sørtun
From:
Mandal, Agder, Norway
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Posted 24 Jun 2018 10:32 am
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| Signal coming from where? The closer the output impedance of whatever is driving your equipment through the Y connection is to zero, the less loss you'll experience. |
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Scott Denniston
From:
Hahns Peak, Colorado, USA
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Posted 24 Jun 2018 11:20 am
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| Thanks Georg. It would only be about a foot or so to the split from the source. |
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Georg Sørtun
From:
Mandal, Agder, Norway
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Posted 24 Jun 2018 12:10 pm
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| Don't think you understood me. Cable length doesn't matter, only the actual impedance of the source of the signal. |
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Jim Park
From:
Carson City, Nv
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Posted 24 Jun 2018 12:33 pm
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| I think a simple XLR splitter cable is what you want |
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John Groover McDuffie
From:
LA California, USA
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Posted 27 Jun 2018 6:01 pm
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If you are splitting a trs output to feed 2 xlr inputs what determines the balance between the two XLR outs is the input impedance of the 2 devices you are plugging into. Ideally they should be the matched. If one input has much lower input impedance than the other, then the one with the higher input impedance will effectively see a lower signal level.
If you are combining 2 XLR outputs to a single trs input you should have a resistor network to mix them so that there is some isolation between the 2 outputs.
And for audio signals it is always best to have the output impedance of the source be lower than the input impedance it is driving. |
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Georg Sørtun
From:
Mandal, Agder, Norway
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Posted 27 Jun 2018 6:28 pm
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| John Groover McDuffie wrote: |
| And for audio signals it is always best to have the output impedance of the source be lower than the input impedance it is driving. |
The "old" rule-of-thumb is 1 to 10, meaning that a source impedance of <10Kohm can drive an input impedance of >100Kohm without significant loss.
Split to two inputs each input should then preferable have an impedance of >200Kohm, in which case both will receive the full signal and not "steal" from each other even if they do not have exactly the same input impedance. |
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