Peter1955 <Peter1955@[EMAIL PROTECTED]
> wrote:
>Hallo
>
>Cann anybody give me an advice? Last year a bought some equipement for
>recordinding a small childrens choir.
>
>I'm using a Behringer UBB1002 (5 mic. ch.) ****table mixer (with the
>220V powersupply). Analogue recording takes place on a Sharp Mini-Disk
>recorder or on a laptop.
>
>When I'm connecting my Superlux CM-H8K condersor mic's to the mixer --
>via DAP 6-10 meter XLR-cables-- I hear a low level 50 hz hum (with
>several harmonic's) via my headphone. The headphone is connected
>direct on the mixer.
Either it's the mixer, the microphone, or the cables. Swap each one of
the three out in term and see what happens.
>It starts when I'm switching the Phantom power on, in order to
>activate the amps in de mic's, and gaining the mic's up.
>When I connect some older AT microphones (a-symm.) I do not have the
>problem.
If the AT microphones are unbalanced dynamic mikes, they can't be used
for comparison. Try some other balanced mikes that require phantom power.
>Who cann help?
>Cann the cause be that the UBB10002 only supplies only 23 V. for the
>Phantompower? Or is somehing wrong with de AC/DC conversion of the
>mixer?
A lot of condenser microphones will not work with 23V phantom power. That
might well be the problem. In fact, most phantom powered microphones
won't
work with a voltage that low, and selling a console that provides only 23V
phantom power is shameful.
Swap the microphones out with SM-81s, for instance... the SM-81 is rated
for phantom power as low as 12V and it should be fine. If the hum
persists,
it's the console or cable.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
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