Re: Using Cool Edit notch filters

"Bill Bremmer" <gateway44@xxxxxxxxxxx> wrote:

I've noted these readings with the mic switch off: At 4 o'clock -47 dB, at
12 o'clock -63, and at 9 o'clock -76 dB. As I said, I recorded a test with
the mic on and off at 4 o'clock. there is only a 2 or 3 dB difference when
the mic is on and when it's off.

That's strange. I don't know any mic amp that is as noisy as the
signal that comes from the mic.

How do I know if the shield on the mic
cable is open or I have a ground loop on the system? The only things
connected to the PC are essentials, mouse, keyboard, monitor and the USB to
power the Mobile-Pre. No internet connection, printer etc.

Ok, then there's no ground loop.

The switch that I
am using is the mic switch. I do not get any noise when I touch the mic or
plug and I don't move the mic.

Does the noise change when the mic is placed at a different location?
I suspect some stray magnetic fields that the mic picks up. Dynamic mic
may respond to magnetic fields.

I can try noise levels with the mic unplugged. Could this result be
different than just turning off the mic switch?

It would be strange if you get the same results.

BTW, I suffer from a similar problem, however, far less severe.
I have a new Edirol M-16DX which has 4 mic inputs and USB connection
to the computer. The inputs #1 and #4 generate a slight buzz, 60 dB
below maximum level on input #1 and 84 dB on input #4. The frequency
is 142 Hz, saw tooth! Nothing to heal with filtering because of the harmonics.
I'll sent the unit back for repair.

Norbert
.

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