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Old 29th April 2005, 08:27 PM   #1
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Default Phantom Power might be Bad?

Hi there,
This may seem like a silly question, but i can`t find the answer anywhere.

I have a mixing desk that supplies phantom power +48V
I use a condensor mic that is powered from the mixer. Now what I want to do is to put a samson s-com compressor/limiter in between the mixer and Microphone.

Will the phantom power damge the compressor? and will the power actually get to the Mic?

Cheers for the help.



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Old 29th April 2005, 08:30 PM   #2
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The compressor should have DC blocking on it's output so you should be safe. However, the mic will no longer be powered unless the compressor can supply phantom power.
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Old 29th April 2005, 09:00 PM   #3
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You need to use the compressor on an insert or FX send/return.
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Old 29th April 2005, 10:44 PM   #4
moamps is offline moamps  Croatia
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Quote:
Originally posted by pinkmouse
You need to use the compressor on an insert or FX send/return.
Using FX send/ret for this purpose isn't good idea.

From s-com manual:
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Old 29th April 2005, 10:57 PM   #5
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Quote:
Originally posted by moamps
Using FX send/ret for this purpose isn't good idea.
True, it's not ideal, but if you have no inserts it's better then using it across the outputs, which is the only other option.
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Old 30th April 2005, 07:48 PM   #6
anatech is offline anatech  Canada
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Pinkmouse has it right. Effects always go in the send-rcv patch. I haven't seen many consols that supply phantom power that do not have send-receive patch points. That's what the instructions indicate as well.
-Chris
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Old 30th April 2005, 09:25 PM   #7
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I have worked on a commercial 'capacitor' mic preamp and the vagaries of supply.

Despite such limitations, it is possible, using constant current sources in the supply feeds, to obtain substantial overload margin/headroom but such a tack is rarely taken by either mixer companies or mic manufacturers. Obviously there are issues of noise when introducing a comp/lim into the chain at such an early stage especially given that the good mics only buffer the C and don't amplify at all.
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Old 30th April 2005, 09:42 PM   #8
anatech is offline anatech  Canada
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Oh yeah. Can you imagine how much noise there will be using a line device at mic level and amplifying it? Never mind it probably won't compress at all at mic levels - including a noise gate might make it permanently quiet though!
-Chris
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Old 30th April 2005, 10:04 PM   #9
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Exactly!

You would need a dedicated mic preamp/com/lim and then go in on a line level.
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Old 30th April 2005, 10:11 PM   #10
moamps is offline moamps  Croatia
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Quote:
Originally posted by pinkmouse
True, it's not ideal, but if you have no inserts it's better then using it across the outputs, which is the only other option.
Hi,

if the console we're discussing here isn't equipped with a channel insert point then it is also unlikely that there would be an "on-off channel assign" switch. Also, the FX send is always placed after the channel fader, which means that you can't assign only the compressed signal to the mix out (thru the FX return) without sending the (uncompressed) original signal thru the mix buss. A better idea might be using Aux out, which is pre-fader assigned (if the console has one).

Quote:
Originally posted by anatech
[B]...Effects always go in the send-rcv patch.....
Effects always go in the FX send-FX stereo return path. Compressors always go in the channel-group-mix insert-return path.

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Milan
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