Thanks for the help.
I am using a K6 unit with a battery. The recorder is a Sony PCM-D50.
I tried a couple more recordings and found that there is a band at about 60=
Hertz and 120 Hertz with the Sennheiser and to a much lesser degree with t=
he internal mics on the recorder. I will try a recording outside in a trul=
y quiet environment.
Bruce
--- In "Avocet" <> wrote:
>
> > I am having trouble with a very loud low frequency hum in my
> > Sennheiser microphones.
>
> Bruce,
>
> Is it indoors and is the hum at line frequency? If so check the leads
> which may be "one legged" with a short on one of the balanced lines or
> a screen may have broken. Move all leads away from anything with a
> transformer.
>
> If none of these options, it must be from the K6 or the recorder. Swap
> around everything you can.
>
> A low level hum at an exact frequency can be filtered out with a notch
> filter without damaging a recording, but not if there are higher
> "buzz" frequencies.
>
> David
>
> David Brinicombe
> North Devon, UK
> Cogito cogito ergo cogito sum - Ambrose Bierce
>
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