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Author Topic: disabling 48v on XLR  (Read 5614 times)

Keith Finch

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Re: disabling 48v on XLR
« Reply #10 on: January 14, 2018, 11:13:29 AM »

As Todd Stated use a F-XLR to TRS no 48v power is supplied to the 1/4" socket on the interface. It will also get you in LINE level mode
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Tim McCulloch

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Re: disabling 48v on XLR
« Reply #11 on: January 14, 2018, 11:18:44 AM »

Uh.... how about lifting Pin 1?

Phantom power *ground* is on Pin 1, +48v is on pins 2 & 3.  Lifting pin 1 means no ground and no phantom power.
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Pete Erskine

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Re: disabling 48v on XLR
« Reply #12 on: January 14, 2018, 12:19:11 PM »

Uh.... how about lifting Pin 1?

Phantom power *ground* is on Pin 1, +48v is on pins 2 & 3.  Lifting pin 1 means no ground and no phantom power.

Somewhere your system will find a common ground....
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John Roberts {JR}

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Re: disabling 48v on XLR
« Reply #13 on: January 14, 2018, 12:43:50 PM »

Uh.... how about lifting Pin 1?

Phantom power *ground* is on Pin 1, +48v is on pins 2 & 3.  Lifting pin 1 means no ground and no phantom power.

Do you feel lucky?

Mixer is most likely grounded. Sound card ?? don't know.

Caps are cheap and will block DC current from flowing. If sound card is not grounded it might still float up to 48V from cap leakage. Small (high value) drain resistors from sound card side of lines 2 and 3 to pin one will drain leakage from the caps.


JR
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David Sturzenbecher

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Re: disabling 48v on XLR
« Reply #14 on: January 14, 2018, 01:00:03 PM »

As Todd Stated use a F-XLR to TRS no 48v power is supplied to the 1/4" socket on the interface. It will also get you in LINE level mode

^^ This
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Ivan Feder

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Re: disabling 48v on XLR
« Reply #15 on: January 14, 2018, 03:37:28 PM »

^^ This
Thanks to the board ,
I will measure the TRS to see if there is in fact no 48 v across the connector. If there is , I will probably try a transformer since I have an in-line one lying around. Plan C will be the caps across pin 2&3.
Thanks to all,
Best regards from Paris!
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Dave Garoutte

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Re: disabling 48v on XLR
« Reply #16 on: January 14, 2018, 05:18:42 PM »

Or you could get a remote phantom power supply for the mic and leave the Phantom off on the Scarlett.
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David Sturzenbecher

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Re: disabling 48v on XLR
« Reply #17 on: January 14, 2018, 05:39:46 PM »

Thanks to the board ,
I will measure the TRS to see if there is in fact no 48 v across the connector. If there is , I will probably try a transformer since I have an in-line one lying around. Plan C will be the caps across pin 2&3.
Thanks to all,
Best regards from Paris!

I just measured my Scarlett 2i2 and there was no phantom on the 1/4" when there was on the XLR.
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Ivan Feder

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Re: disabling 48v on XLR
« Reply #18 on: January 15, 2018, 04:07:49 AM »

I just measured my Scarlett 2i2 and there was no phantom on the 1/4" when there was on the XLR.
Thanks David for measuring for me :-) Problem solved ;D
« Last Edit: January 15, 2018, 04:10:10 AM by Ivan Feder »
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Justice C. Bigler

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Re: disabling 48v on XLR
« Reply #19 on: January 15, 2018, 04:50:34 AM »

I guess I'm late to the party, but the Scarlett 2i2 (assuming you have a 2i2 or 2i4) manual says that phantom power is supplied only to the XLR connections and not the 1/4" sockets. Which, being that the 1/4" sockets are also TS and TRS, could royally fuck up the guitar electronics if they passed 48v to the instrument input also.
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Re: disabling 48v on XLR
« Reply #19 on: January 15, 2018, 04:50:34 AM »


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