Does your computer run on 60 hz power or 50 Hz power?
Do you mean HUM or BuZZ rather than rumble?

Rumble to most of us is the sound that came from our
turntables when spinning vinyl records. Buzz and Hum come from
the power lines etc.


peace
dawg

"D" <tarb@bk.ru> wrote in message
news:1192480473.647816.62910@z24g2000prh.googlegro ups.com...
> Hello!
> A background (about 50hz) rumble appears in a sound from
> microphone.
> Windows XP SP2.
> I tried two headsets (which surely are good). The rumble
> decreases if
> I touch the computer case. I checked the inside of the case,
> did not
> find any improper contacts. The sound card is Creative sound
> blaster
> live ct4830. I tried the latest Microsoft and Creative
> drivers. The
> Creative driver does not output sound from microphone to
> speakers at
> the same time, but only from a recording from the
> microphone. How to
> prevent the rumble?
> Best regards,
> Dima
>