phantom power and

[shure_1302]

Hi!

I have Presonus firebox. Everything is fine, but I just realized that I need to record from two mics - one requires phantom power and other does not. But the firebox sends 48V on the both inputs. Is it possible to overcome ?

And related question: how can i record for example vocal from mic with XLR plugged in combined XLR/1/4 input with phantom power on and acustic guitar plugged with 1/4"? In other words does this combined socket sends 48V to 1/4 jack? May I plug in the guitar to combined socket when phantom power is on?

Thank you all indeed.

[richiebee]

Dynamic mics don't usually care whether its on or off... if its on, they just won't use it. Not all mics are as carefree, but you should be fine with dynamics. Similarly, your guitar won't care either.

[brandondrury]

Some freak at the idea of running phantom power to a ribbon mic, but I've screwed up and ran phantom to my Royer R121 at least 20 times and have never cooked it.

You have nothing to worry about. If you needed seperate control for phantom power, they would have designed the Firepod that way.

Brandon

[shure_1302]

Thank you richiebee and brandondrury.
It sounds quite reassuring.

[AfaraWayland]

Originally Posted by richiebee

Dynamic mics don't usually care whether its on or off... if its on, they just won't use it. Not all mics are as carefree, but you should be fine with dynamics. Similarly, your guitar won't care either.

yeah, I work at a Tv studio where the director and others are all the time freaking about phantom with dynamics, for things like EV omnis the like (standard reporter mic)

I always bite my tounge.

my question relating to this is,

is there a level of phantom power in standard use cable to fry components on a dynamic mic??

[brandondrury]

is there a level of phantom power in standard use cable to fry components on a dynamic mic??

I'm not sure if I entirely understand what you are asking. (I don't think that statement came out right).

I've heard from knowledgeable people that there is not a real way to fry a dynamic mic with phantom power.

I've probably ran phantom power to dynamic mics a hundred billion times with no problems.

Brandon

[AfaraWayland]

what I mean is there a level of intensity (of DC) that is a standard (Other than/higher than) +48V phantom that different facets of the industry use that is capable of frying a dyn. mic.

I've always know the same way, that the mic doesn't see it or react to it.

But aside from the fact that I think the higher ups (like the director) don't really understand that, could they be using a voltage level hot enough to substantiate their fear?

Like I said, I always bite my tounge.

Perhaps they just think they know what they're talking bout. It wouldn't surprise me...

[richiebee]

I'm no electronics expert, but as I understand it, dynamic mics cannot be affected by phantom power through design, though I have heard that it can affect unbalanced dynamic mics (though probably even then won't actually damage them... this should only really apply to cheap and nasty mics that should be blown up anyway!

Ribbon's may be sensitive to them... I wouldn't risk it with a ribbon mic, but I wouldn't even think about it with a dynamic.

R.

[brandondrury]

That's a good question Afarawayland. I'm speculating here, but I've always got the same vibe that Richiebee layed out...voltage shouldn't matter.

In some circles, they do you use higher voltage for the phantom power. There was a big thread on this years ago on another forum, but I can't remember much about it.

In the end, the practical knowledge I learned was
#1)Yes, there are higher phantom power voltages out there
#2)Don't ever put phantom power to a ribbon (even though the Royer seams to handle it much better than something like an old RCA 44DX).
#3)Don't worry about phantom power with dynamics.

This limited level of understanding has gotten me by just fine, but you may want to really research the topic.

Brandon

[AfaraWayland]

nah, just wonderin...

thanks for the reply-