A background rumble appears in a sound from microphone in Sound blaster Live.

[Bob I]

Thanks Richard Crowley for your answers!
I have two cards: SB Live ct4830 and SB 16 PnP. They both hum from a
headset microphone.
Best regards,
Dima

I suspect that it isn't the Microphone that is humming but that a HUM is
heard in the headphones WHEN the microphone is plugged in? If that is
the case then perhaps the problem is the filter capacitors on the
motherboard or powersupply are the problem?

 

[Guest]

D

Your card may not be up to the job. Creative bought E-mu as I remember,
think about a 1212m, it has balanced line and the same converters used in
the Pro Tools stuff. You probably will never be really happy with the card
you have now. For currently $50.00 on E-bay you can get a 1212m, a daughter
card will even give you time code.


http://cgi.ebay.com/EMU-E-MU-1212M-...ryZ41784QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

 

[Laurence Payne]

Your card may not be up to the job. Creative bought E-mu as I remember,
think about a 1212m, it has balanced line and the same converters used in
the Pro Tools stuff. You probably will never be really happy with the card
you have now. For currently $50.00 on E-bay you can get a 1212m, a daughter
card will even give you time code.

Line in on the SB will be fine too. We're just fighting a lousy mic
input and a selection of more-or-less lousy microphones. You can get
away with lousy sometimes But not always.

 

[D]

I suspect that it isn't the Microphone that is humming but that a HUM is
heard in the headphones WHEN the microphone is plugged in? If that is
the case then perhaps the problem is the filter capacitors on the
motherboard or powersupply are the problem?- Hide quoted text -

- Show quoted text -

Thanks Bob I for your opinion!
A HUM is heard in the headphones WHEN the microphone is plugged in and
not muted. The hum is not heard when the microphone is muted.
How to know which filter capacitors are the problem: on the
motherboard or powersupply?
Best regards,
Dima

 

[Bob I]

Thanks Bob I for your opinion!
A HUM is heard in the headphones WHEN the microphone is plugged in and
not muted. The hum is not heard when the microphone is muted.
How to know which filter capacitors are the problem: on the
motherboard or powersupply?
Best regards,
Dima

That would be a hardware issue, the powersupply would be the easiest to
swap out. You've proved the soundcards don't make a difference.

 

[D]

That would be a hardware issue, the powersupply would be the easiest to
swap out. You've proved the soundcards don't make a difference.- Hide quoted text -

- Show quoted text -

Thanks Bob I for your suggestion!
Could a mainboard BIOS setting be the problem? The same hum was with
an old power supply. The hum increases if I increase the microphone
volume.
Best regards,
Dima

 

[Bob I]

Thanks Bob I for your suggestion!
Could a mainboard BIOS setting be the problem? The same hum was with
an old power supply. The hum increases if I increase the microphone
volume.
Best regards,
Dima

I would doubt that a BIOS setting would have an effect on this. Since
the hum is being picked up in the microphone circuitry and being
amplified, increasing the mike volume increases the sounds. You might
try moving the sound card to a different motherboard slot to see if
there is any reduction in the hum by moving it further away from some
component.

 

[D]

I would doubt that a BIOS setting would have an effect on this. Since
the hum is being picked up in the microphone circuitry and being
amplified, increasing the mike volume increases the sounds. You might
try moving the sound card to a different motherboard slot to see if
there is any reduction in the hum by moving it further away from some
component.- Hide quoted text -

- Show quoted text -

Thanks Bob I for your suggestion!
I installed the sound cards to different slots. This did not help.
Best regards,
Dima

 

[Bob I]

Thanks Bob I for your suggestion!
I installed the sound cards to different slots. This did not help.
Best regards,
Dima

Then it would seem that the motherboard would be the problem. Is there
perhaps any "swollen" or leaking capacitors on the motherboard.

 

[nobody >]

Bob I wrote:

snip

Then it would seem that the motherboard would be the problem. Is there
perhaps any "swollen" or leaking capacitors on the motherboard.

Has anyone considered a bad AC outlet ground?

Also, I've lost track of the REAL symptoms. Does the microphone output
hum or do the headphones hum just because the mic is plugged in?

 

[Bob I]

Bob I wrote:

snip




Has anyone considered a bad AC outlet ground?

Also, I've lost track of the REAL symptoms. Does the microphone output
hum or do the headphones hum just because the mic is plugged in?

Yes the headphones hum when the mic is plugged in and not muted.

 

[Jim McCardle]

I have personally had this sort of problem quite a while back. It was
really bad if you moved the mouse. I found updating the mouse
software fixed the problem. Also check if the IRQ that the sound card
is using is being "shared", this can cause some problems also.
JMCC
======================================================

 

[D]

Then it would seem that the motherboard would be the problem. Is there
perhaps any "swollen" or leaking capacitors on the motherboard.- Hide quoted text -

- Show quoted text -

Thanks Bob I for your help!
There are no any "swollen" or leaking capacitors on the motherboard.
Dima

 

[D]

I have personally had this sort of problem quite a while back. It was
really bad if you moved the mouse. I found updating the mouse
software fixed the problem. Also check if the IRQ that the sound card
is using is being "shared", this can cause some problems also.
JMCC
======================================================






- Show quoted text -

Thanks Jim McCardle for your reply!
The hum is with a Logitec mouse. I will check with another mouse. It
is really bad if I move the mic farther from the system case.
Dima

 

[D]

Bob I wrote:

snip









Has anyone considered a bad AC outlet ground?

Also, I've lost track of the REAL symptoms. Does the microphone output
hum or do the headphones hum just because the mic is plugged in?- Hide quoted text -

- Show quoted text -

Thank nobody > for your reply!
My apartment house does not have a third groud contact in AC outlets,
because it is old. They cannot make the ground in such an old
building.
Dima

 

[Laurence Payne]

My apartment house does not have a third groud contact in AC outlets,
because it is old. They cannot make the ground in such an old
building.

Is that what you've been told? Of course they can, in exactly the
same selection of ways it would be done in a new building. Here in
the UK it's legally required, and even the oldest buildings find a way

 

[D]

Is that what you've been told? Of course they can, in exactly the
same selection of ways it would be done in a new building. Here in
the UK it's legally required, and even the oldest buildings find a way

Thanks Laurence Payne for your reply!
Yes, that is what I've been told. But now, they are considering my
requirement.
How to check a quality of the grounding in AC outlets? I don't believe
my apartment house electricians completely.
Best regards,
Dima

 

[Unknown]

If no third ground contact, have an electrician remove the two contact
outlet and install a three contact outlet. Connect the ground to the metal
box.

 

[Bob I]

Also that metal box better be connected to earth!

If no third ground contact, have an electrician remove the two contact
outlet and install a three contact outlet. Connect the ground to the metal
box.

 

[Laurence Payne]

If no third ground contact, have an electrician remove the two contact
outlet and install a three contact outlet. Connect the ground to the metal
box.

And that metal box will be earthed how?