[Paul Stamler]

"D" wrote in message
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?

By "rumble", do you mean hum? Where are you located? What's the line
frequency where you live?

If the "rumble" isn't hum, then it could be a mechanical resonance of the
computer's case with one of the fans. One way to reduce this is to put
adhesive pads on the metal case; they're usually sold for dampening rattles
in cars.

Peace,
Paul