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Re: phantom power limits & effects

Subject: Re: phantom power limits & effects
From: "Scott Fraser" scottbfraser
Date: Tue Jun 12, 2012 7:53 am ((PDT))
<<i've been doing some research for a pal on some of the lower cost multi c=
hannel recorders & noticed this spec:

48 V + or - 4 V, 8 mA per 1 channel (20 mA or less in all channels - 4 chan=

that 'should' be enough to power most conventional mics but if some were co=
nnected that needed more what would the actual effect be in practice ? woul=
d only that input be affected or would the power across all inputs by decre=
ased ?>>

Most mics can run just fine on very little phantom current & diminished vol=
tage, however, I know from unpleasant experience that various Neumanns, bot=
h large & small diaphragm models, really do need the full 48 volts at their=
 specified current. Running on less results in an audible loss of headroom.=
 AKG & Shure condensers are spec'ed to work in the range of 9 to 52 volts. =
Since phantom power is distributed on a buss across all inputs, the current=
 demand should be the sum of the 4 mics in use, with the more demanding mic=
s possibly running out of steam on peaks.

Scott Fraser

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