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Phantom Power and 1/4" Jack Leads....?! Help Please.
Old 20th January 2013
  #1
Here for the gear
 
🎧 5 years
Phantom Power and 1/4" Jack Leads....?! Help Please.

Hia there,
I'm new to the forums so hopefully this hasn't been answered before

I'm looking to buy a Focusrite Saffire Pro 40.
The only downside to this interface is that phantom power is turned on and off in groups of 4. One switch for channels 1-4 and another for 5-8. It has combo inputs (both jack and XLR in one).

What I need to know is...
If there was a situation where I need phantom power on more than 4 inputs (so channels 1-6 for example) then the phantom power would be on for all inputs (due to the grouping). Would I be safe to plug a 1/4" Jack lead for a guitar into a combi input which has phantom power on (as there would be no way to turn it off on that one channel).

I've head that it should be okay, but also head that you can blow the electronics by doing so. I don't want to damage my guitar or the interface.

Thanks guys
Old 20th January 2013
  #2
Lives for gear
 
🎧 10 years
The phantom power shouldn't be on the 1/4" jacks if there's any sense to the design, but you never know.
Old 20th January 2013
  #3
Lives for gear
 
🎧 15 years
Yes, it is OK. I have this interface and have done this before. The combo jacks use separate pins for the XLR and 1/4" contacts.

Tim
Old 20th January 2013
  #4
Here for the gear
 
🎧 5 years
Ah thank you so much Tim
I wasn't sure if it would affect anything an the idea that I'd have to choose between phantom power on more than 4 inputs and plugging in my guitar was the only thing that was going to stop me buying this interface

So am I right in understanding that although it is a combi input, the XLR and Jack parts are wired up separately inside so that the phantom power does not run through the jack part?
Old 21st January 2013
  #5
Lives for gear
 
🎧 15 years
Yes, I just serviced a Presonus interface for a customer that had a bad combo jack. The connector had ten pins, it was an Amphenol ACJC9H. There were pins for the XLR plus the TRS, plus switching pins so the interface knows when a 1/4" is plugged in.

Amphenol, Connectors, XLR, Audio

I own a Focusrite Saffire Pro 40 and took it apart (that's what I do to everything...), and they use a similar jack.

Tim
Old 21st January 2013
  #6
Here for the gear
 
🎧 5 years
Ah thanks so much
Thanks for explaining it so well
Old 22nd April 2013
  #7
Here for the gear
 
🎧 5 years
Will this same thing apply to the Presonus Audiobox 2x2?
Old 25th April 2013
  #8
Here for the gear
 
🎧 5 years
Yeah It should do, check with your local tech shop
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