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Phantom power and instruments

 
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Comrad_Durandal
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Joined: 24 Apr 2012
Posts: 166
Location: Minneapolis, MN

PostPosted: Fri Mar 22, 2013 7:08 pm    Post subject: Phantom power and instruments Reply with quote

I have a Focusrite Saffire Pro24 with two front inputs that supply 48V phantom power through a XLR/TRS combo jack. I have a condenser microphone connected to the first channel, so I have the phantom power active. I want to connect my acoustic guitar's line output to the second channel, but I don't want to damage its onboard pickup - I'd be using a TRS to TRS cable, though I've heard most instruments are TS wired. The Saffire Pro24 only allows you to turn the phantom power option on or off for both channel one AND two, not individually. I am wondering if I can use this front input without fear of damage, or do I need to see about getting a higher-end interface that allows individual control of phantom power to the front inputs.
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xmlguy
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Joined: 26 Nov 2007
Posts: 3605

PostPosted: Fri Mar 22, 2013 8:27 pm    Post subject: Reply with quote

Phantom power should only be on the XLR jack conductors, not on the 1/4" jack conductors, even when the I/O box has a combo XLR+1/4" jack. The problem would be if you tried to use an XLR to 1/4" stereo plug (TRS) cable adapter, when the XLR has phantom power.
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michelkeijzers
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Joined: 08 Feb 2007
Posts: 9113
Location: Netherlands

PostPosted: Sun Mar 24, 2013 4:09 pm    Post subject: Reply with quote

Also I have once encountered a mixing console that put phantom power on every XLR output which my JBL monitor did not like.

What helped was inserting a DI box in between.
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Developer of the free PCG file managing application for most Korg workstations: PCG Tools, see https://www.kronoshaven.com/pcgtools/
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mariachisocial
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Joined: 25 Jun 2013
Posts: 17

PostPosted: Tue Jul 02, 2013 3:21 pm    Post subject: introduction Reply with quote

Hello everyone i am new here and i really like to fill online forum.
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