On 16 mei, 17:07, klu...@[EMAIL PROTECTED]
(Scott Dorsey) wrote:
> Peter1955 <Peter1...@[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."
Hallo
Yes, Behringer admits that the specs in the manual are correct and the
UBB1002 only delivers 23 Volt .
They are pretending that 23V. should not be a problem for most
condensor-mics and couldn't be the cause of the hum.
I'll connect the mic's to an other good working mixer and see what
happens.
Peter
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