On Oct 17, 1:44 am, "Richard Crowley" <rcrow...@xp7rt.net> wrote:
> "D" wrote ...
>
> > It does not hum when no headset is plugged in.
>
> Then you can eliminate any problem with the computer,
> the sound card, or any software including drivers, etc.
>
> > One of the headsets is brand new and checked.
>
> What does "checked" mean? Do either of the headsets work
> OK on another computer?
>
> > Yes, the hum changes when I move the headset around the room: the
> > further from the computer case the louder.
>
> I would take a wild guess that it has a shielding or grounding problem.
>
> > Yes, it hums when I try using a differen computer mic: both headsets.
>
> The problem may be with the basic design if both headsets
> show the same symptoms.

Thanks Richard Crowley for your suggestions!
The hum is from speakers, not from the case.
Yes, either of the headsets work OK on another computer.

"D" wrote ...
> The hum is from speakers, not from the case. Yes, either of the
> headsets work OK on another computer.

Then it is possible that the sound card has a problem.
Since the sound card feeds power into the microphone in
the handset, the filter capacitor on the microphone power
may have a problem that is letting 50Hz hum get injected
into whatever microphone is connected. You would not
hear this unless a microphone was connected. Since the
headsets work OK on another computer, that casts the
suspicion back on the sound card.

On Wed, 17 Oct 2007 13:15:59 -0700, "Richard Crowley"
<rcrowley@xp7rt.net> wrote:

>"D" wrote ...
>> The hum is from speakers, not from the case. Yes, either of the
>> headsets work OK on another computer.
>
>Then it is possible that the sound card has a problem.
>Since the sound card feeds power into the microphone in
>the handset, the filter capacitor on the microphone power
>may have a problem that is letting 50Hz hum get injected
>into whatever microphone is connected. You would not
>hear this unless a microphone was connected. Since the
>headsets work OK on another computer, that casts the
>suspicion back on the sound card.

Perhaps the sound card just has the problem that it's a Soundblaster
Live! and you're using the mic input. A SB's Line in/out is
acceptable quality but the mic input is a joke.

D <tarb@bk.ru> wrote in
news:1192643503.835320.11570@v29g2000prd.googlegro ups.com:

> On Oct 17, 1:55 am, thanatoid <wait...@the.exit.invalid>
> wrote:
>> D <t...@bk.ru> wrote
>> innews:1192566775.737035.158850@k35g2000prh.google gr
> oups.com:
>>
>> > Thanks kráftéé for your suggestions!
>> > I checked with brand new headset - the same.
>>
>> Sounds like it's not the mic, but you may have a short of
>> some kind or ground loop in your headphone connection. If
>> the headphone connection is at the front of your machine,
>> a technician has to check it.
>>
>> If it's a jack on the soundcard, you can remove the sound
>> card and take it to a technician without having to take
>> the whole computer over there.
>>
>> --
>> Waiting for the day when it is illegal to use anything but
>> Vista on any computer in the world.
> Thanks thanatoid for your suggestions!
>

You're welcome and good luck. Check if a new sound card isn't
cheaper than fixing yours!
Creative is basically OK and ultra-compatible although
perfectionists complain about the sound/specs.
M-Audio if you're a musician or have very good ears.
Turtle Beach is pretty good too if you can find one.

--
Waiting for the day when it is illegal to use anything but Vista
on any computer in the world.

On Oct 17, 10:13 pm, Bob I <bire...******.com> wrote:
> The problem is likely caused by the combination of "speakers" being
> disconnected by the insertion of the head phones AND the volume knob of
> the speakers being cranked up rather high. Now the speakers are
> amplifying the hum of the little power wart.
>
>
>
> D wrote:
> > On Oct 17, 1:44 am, "Richard Crowley" <rcrow...@xp7rt.net> wrote:
>
> >>"D" wrote ...
>
> >>>It does not hum when no headset is plugged in.
>
> >>Then you can eliminate any problem with the computer,
> >>the sound card, or any software including drivers, etc.
>
> >>>One of the headsets is brand new and checked.
>
> >>What does "checked" mean? Do either of the headsets work
> >>OK on another computer?
>
> >>>Yes, the hum changes when I move the headset around the room: the
> >>>further from the computer case the louder.
>
> >>I would take a wild guess that it has a shielding or grounding problem.
>
> >>>Yes, it hums when I try using a differen computer mic: both headsets.
>
> >>The problem may be with the basic design if both headsets
> >>show the same symptoms.
>
> > Thanks Richard Crowley for your suggestions!
> > The hum is from speakers, not from the case.
> > Yes, either of the headsets work OK on another computer.- Hide quoted text -
>
> - Show quoted text -
Thanks Bob I for your explanation!
How can the speakers amplify the hum of the little power wart if they
are disconnected by the insertion of the head phones?
A Sony ECM-T6 microphone and another desk-top microphone don't hum! A
new Koss sb/45 headset and Philips SBC HM300 headset hum from their
microphones.
How to make Koss sb/45 headset microphone work?
Best regards,
Dima

On Oct 18, 3:59 am, Laurence Payne <NOSPAMlpayne1ATdsl.pipex.com>
wrote:
> On Wed, 17 Oct 2007 13:15:59 -0700, "Richard Crowley"
>
> <rcrow...@xp7rt.net> wrote:
> >"D" wrote ...
> >> The hum is from speakers, not from the case. Yes, either of the
> >> headsets work OK on another computer.
>
> >Then it is possible that the sound card has a problem.
> >Since the sound card feeds power into the microphone in
> >the handset, the filter capacitor on the microphone power
> >may have a problem that is letting 50Hz hum get injected
> >into whatever microphone is connected. You would not
> >hear this unless a microphone was connected. Since the
> >headsets work OK on another computer, that casts the
> >suspicion back on the sound card.
>
> Perhaps the sound card just has the problem that it's a Soundblaster
> Live! and you're using the mic input. A SB's Line in/out is
> acceptable quality but the mic input is a joke.
Thanks Richard Crowley and Laurence Payne for your explanations!
A Sony ECM-T6 microphone and another desk-top microphone don't hum! A
new Koss sb/45 headset and Philips SBC HM300 headset hum from their
microphones.
How to make Koss sb/45 headset microphone work?
Best regards,
Dima

On Oct 18, 8:19 am, thanatoid <wait...@the.exit.invalid> wrote:
> D <t...@bk.ru> wrote innews:1192643503.835320.11570@v29g2000prd.googleg roups.com:
>
>
>
>
>
> > On Oct 17, 1:55 am, thanatoid <wait...@the.exit.invalid>
> > wrote:
> >> D <t...@bk.ru> wrote
> >> innews:1192566775.737035.158850@k35g2000prh.google gr
> > oups.com:
>
> >> > Thanks kráftéé for your suggestions!
> >> > I checked with brand new headset - the same.
>
> >> Sounds like it's not the mic, but you may have a short of
> >> some kind or ground loop in your headphone connection. If
> >> the headphone connection is at the front of your machine,
> >> a technician has to check it.
>
> >> If it's a jack on the soundcard, you can remove the sound
> >> card and take it to a technician without having to take
> >> the whole computer over there.
>
> >> --
> >> Waiting for the day when it is illegal to use anything but
> >> Vista on any computer in the world.
> > Thanks thanatoid for your suggestions!
>
> You're welcome and good luck. Check if a new sound card isn't
> cheaper than fixing yours!
> Creative is basically OK and ultra-compatible although
> perfectionists complain about the sound/specs.
> M-Audio if you're a musician or have very good ears.
> Turtle Beach is pretty good too if you can find one.
>
> --
> Waiting for the day when it is illegal to use anything but Vista
> on any computer in the world.- Hide quoted text -
>
> - Show quoted text -
Thanks thanatoid for your explanations!
A Sony ECM-T6 microphone and another desk-top microphone don't hum! A
new Koss sb/45 headset and Philips SBC HM300 headset hum from their
microphones.
How to make Koss sb/45 headset microphone work?
Best regards,
Dima

D wrote:

> On Oct 17, 10:13 pm, Bob I <bire...******.com> wrote:
>
>>The problem is likely caused by the combination of "speakers" being
>>disconnected by the insertion of the head phones AND the volume knob of
>>the speakers being cranked up rather high. Now the speakers are
>>amplifying the hum of the little power wart.
>>
>>
>>
>>D wrote:
>>
>>>On Oct 17, 1:44 am, "Richard Crowley" <rcrow...@xp7rt.net> wrote:
>>
>>>>"D" wrote ...
>>
>>>>>It does not hum when no headset is plugged in.
>>
>>>>Then you can eliminate any problem with the computer,
>>>>the sound card, or any software including drivers, etc.
>>
>>>>>One of the headsets is brand new and checked.
>>
>>>>What does "checked" mean? Do either of the headsets work
>>>>OK on another computer?
>>
>>>>>Yes, the hum changes when I move the headset around the room: the
>>>>>further from the computer case the louder.
>>
>>>>I would take a wild guess that it has a shielding or grounding problem.
>>
>>>>>Yes, it hums when I try using a differen computer mic: both headsets.
>>
>>>>The problem may be with the basic design if both headsets
>>>>show the same symptoms.
>>
>>>Thanks Richard Crowley for your suggestions!
>>>The hum is from speakers, not from the case.
>>>Yes, either of the headsets work OK on another computer.- Hide quoted text -
>>
>>- Show quoted text -
>
> Thanks Bob I for your explanation!
> How can the speakers amplify the hum of the little power wart if they
> are disconnected by the insertion of the head phones?
> A Sony ECM-T6 microphone and another desk-top microphone don't hum! A
> new Koss sb/45 headset and Philips SBC HM300 headset hum from their
> microphones.
> How to make Koss sb/45 headset microphone work?
> Best regards,
> Dima

The speakers are only disconnected from the audio source, the "wall
wart" is still powering the speakers amplifier. Try turning the volume
knob down or unplug the speakers little power supply.
>

D <tarb@bk.ru> wrote in
news:1192739260.615539.278370@i13g2000prf.googlegr oups.com:

<SNIP>

> Thanks thanatoid for your explanations!
> A Sony ECM-T6 microphone and another desk-top microphone
> don't hum! A new Koss sb/45 headset and Philips SBC HM300
> headset hum from their microphones.
> How to make Koss sb/45 headset microphone work?
> Best regards,
> Dima

IIRC, any Sony mic with the prefix ECM is a quality product -
although even Sony is not what it once was, sadly. That used to
be a prefix for their professional mic line, but that may have
changed.

Nothing which is NOW called professional IS - if it says
"professional" or worse, "professional quality", DON'T buy it.
If it's professional, you'll know it by where it is sold and how
much it costs. All "computer" microphones, headphones, and
speakers are TRASH and always will be.

Koss was a very good brand 35 years ago. It is trash now. The
name was bought by some jerks - like it has happened with MANY
formerly good brands - and now they sell junk with a formerly-
good brand name on it. Put it in the garbage where it belongs.

If you want a decent headset/mic combo that will work properly
and does not have wires inside touching where they shouldn't
etc., you will need to spend a fair bit of money. I am talking
Sennheiser, Beyer, etc. Hundreds of dollars. NOT made in China
****.

Much cheaper to get a gooseneck desk stand for your mic and use
the 2 separate devices. Easier on your head physically, as well,
and doesn't get in the way of enjoying your coffee or vodka. (Or
both together.)

--
Waiting for the day when it is illegal to use anything but Vista
on any computer in the world.

On Oct 19, 1:37 am, Bob I <bire...******.com> wrote:
> D wrote:
> > On Oct 17, 10:13 pm, Bob I <bire...******.com> wrote:
>
> >>The problem is likely caused by the combination of "speakers" being
> >>disconnected by the insertion of the head phones AND the volume knob of
> >>the speakers being cranked up rather high. Now the speakers are
> >>amplifying the hum of the little power wart.
>
> >>D wrote:
>
> >>>On Oct 17, 1:44 am, "Richard Crowley" <rcrow...@xp7rt.net> wrote:
>
> >>>>"D" wrote ...
>
> >>>>>It does not hum when no headset is plugged in.
>
> >>>>Then you can eliminate any problem with the computer,
> >>>>the sound card, or any software including drivers, etc.
>
> >>>>>One of the headsets is brand new and checked.
>
> >>>>What does "checked" mean? Do either of the headsets work
> >>>>OK on another computer?
>
> >>>>>Yes, the hum changes when I move the headset around the room: the
> >>>>>further from the computer case the louder.
>
> >>>>I would take a wild guess that it has a shielding or grounding problem.
>
> >>>>>Yes, it hums when I try using a differen computer mic: both headsets.
>
> >>>>The problem may be with the basic design if both headsets
> >>>>show the same symptoms.
>
> >>>Thanks Richard Crowley for your suggestions!
> >>>The hum is from speakers, not from the case.
> >>>Yes, either of the headsets work OK on another computer.- Hide quoted text -
>
> >>- Show quoted text -
>
> > Thanks Bob I for your explanation!
> > How can the speakers amplify the hum of the little power wart if they
> > are disconnected by the insertion of the head phones?
> > A Sony ECM-T6 microphone and another desk-top microphone don't hum! A
> > new Koss sb/45 headset and Philips SBC HM300 headset hum from their
> > microphones.
> > How to make Koss sb/45 headset microphone work?
> > Best regards,
> > Dima
>
> The speakers are only disconnected from the audio source, the "wall
> wart" is still powering the speakers amplifier. Try turning the volume
> knob down or unplug the speakers little power supply.
>
>
>
> - Hide quoted text -
>
> - Show quoted text -- Hide quoted text -
>
> - Show quoted text -
Thanks Bob I for your explanation!
The speakers are in a headset. There are no other speakers. A "wall
wart" is not powering a headset.
Why does the hum appear from a headset microphone only, not from a
separate microphone?
Best regards,
Dima

On Oct 18, 8:19 am, thanatoid <wait...@the.exit.invalid> wrote:
> D <t...@bk.ru> wrote innews:1192643503.835320.11570@v29g2000prd.googleg roups.com:
>
>
>
>
>
> > On Oct 17, 1:55 am, thanatoid <wait...@the.exit.invalid>
> > wrote:
> >> D <t...@bk.ru> wrote
> >> innews:1192566775.737035.158850@k35g2000prh.google gr
> > oups.com:
>
> >> > Thanks kráftéé for your suggestions!
> >> > I checked with brand new headset - the same.
>
> >> Sounds like it's not the mic, but you may have a short of
> >> some kind or ground loop in your headphone connection. If
> >> the headphone connection is at the front of your machine,
> >> a technician has to check it.
>
> >> If it's a jack on the soundcard, you can remove the sound
> >> card and take it to a technician without having to take
> >> the whole computer over there.
>
> >> --
> >> Waiting for the day when it is illegal to use anything but
> >> Vista on any computer in the world.
> > Thanks thanatoid for your suggestions!
>
> You're welcome and good luck. Check if a new sound card isn't
> cheaper than fixing yours!
> Creative is basically OK and ultra-compatible although
> perfectionists complain about the sound/specs.
> M-Audio if you're a musician or have very good ears.
> Turtle Beach is pretty good too if you can find one.
>
> --
> Waiting for the day when it is illegal to use anything but Vista
> on any computer in the world.- Hide quoted text -
>
> - Show quoted text -
Dear thanatoid,
Sony ECM-T6 microphone does not hum!
New headset Koss sb/45 and headset Philips SBC HD300 hum from their
microphones!
Why do headsets hum? They work well on another computer.
Best regards,
Dima

D wrote:

> On Oct 19, 1:37 am, Bob I <bire...******.com> wrote:
>
>>D wrote:
>>
>>>On Oct 17, 10:13 pm, Bob I <bire...******.com> wrote:
>>
>>>>The problem is likely caused by the combination of "speakers" being
>>>>disconnected by the insertion of the head phones AND the volume knob of
>>>>the speakers being cranked up rather high. Now the speakers are
>>>>amplifying the hum of the little power wart.
>>
>>>>D wrote:
>>
>>>>>On Oct 17, 1:44 am, "Richard Crowley" <rcrow...@xp7rt.net> wrote:
>>
>>>>>>"D" wrote ...
>>
>>>>>>>It does not hum when no headset is plugged in.
>>
>>>>>>Then you can eliminate any problem with the computer,
>>>>>>the sound card, or any software including drivers, etc.
>>
>>>>>>>One of the headsets is brand new and checked.
>>
>>>>>>What does "checked" mean? Do either of the headsets work
>>>>>>OK on another computer?
>>
>>>>>>>Yes, the hum changes when I move the headset around the room: the
>>>>>>>further from the computer case the louder.
>>
>>>>>>I would take a wild guess that it has a shielding or grounding problem.
>>
>>>>>>>Yes, it hums when I try using a differen computer mic: both headsets.
>>
>>>>>>The problem may be with the basic design if both headsets
>>>>>>show the same symptoms.
>>
>>>>>Thanks Richard Crowley for your suggestions!
>>>>>The hum is from speakers, not from the case.
>>>>>Yes, either of the headsets work OK on another computer.- Hide quoted text -
>>
>>>>- Show quoted text -
>>
>>>Thanks Bob I for your explanation!
>>>How can the speakers amplify the hum of the little power wart if they
>>>are disconnected by the insertion of the head phones?
>>>A Sony ECM-T6 microphone and another desk-top microphone don't hum! A
>>>new Koss sb/45 headset and Philips SBC HM300 headset hum from their
>>>microphones.
>>>How to make Koss sb/45 headset microphone work?
>>>Best regards,
>>>Dima
>>
>>The speakers are only disconnected from the audio source, the "wall
>>wart" is still powering the speakers amplifier. Try turning the volume
>>knob down or unplug the speakers little power supply.
>>
>>
>>
>>- Hide quoted text -
>>
>>- Show quoted text -- Hide quoted text -
>>
>>- Show quoted text -
>
> Thanks Bob I for your explanation!
> The speakers are in a headset. There are no other speakers. A "wall
> wart" is not powering a headset.
> Why does the hum appear from a headset microphone only, not from a
> separate microphone?
> Best regards,
> Dima
>

The confusion comes from the misuse of the term "speaker". The sound
producing components in a headset are called "headphones" or "earphones"
not "speakers", the condition I described applies to powered speakers
not headphones or earphones.

On Oct 19, 4:40 pm, Bob I <bire...******.com> wrote:
> D wrote:
> > On Oct 19, 1:37 am, Bob I <bire...******.com> wrote:
>
> >>D wrote:
>
> >>>On Oct 17, 10:13 pm, Bob I <bire...******.com> wrote:
>
> >>>>The problem is likely caused by the combination of "speakers" being
> >>>>disconnected by the insertion of the head phones AND the volume knob of
> >>>>the speakers being cranked up rather high. Now the speakers are
> >>>>amplifying the hum of the little power wart.
>
> >>>>D wrote:
>
> >>>>>On Oct 17, 1:44 am, "Richard Crowley" <rcrow...@xp7rt.net> wrote:
>
> >>>>>>"D" wrote ...
>
> >>>>>>>It does not hum when no headset is plugged in.
>
> >>>>>>Then you can eliminate any problem with the computer,
> >>>>>>the sound card, or any software including drivers, etc.
>
> >>>>>>>One of the headsets is brand new and checked.
>
> >>>>>>What does "checked" mean? Do either of the headsets work
> >>>>>>OK on another computer?
>
> >>>>>>>Yes, the hum changes when I move the headset around the room: the
> >>>>>>>further from the computer case the louder.
>
> >>>>>>I would take a wild guess that it has a shielding or grounding problem.
>
> >>>>>>>Yes, it hums when I try using a differen computer mic: both headsets.
>
> >>>>>>The problem may be with the basic design if both headsets
> >>>>>>show the same symptoms.
>
> >>>>>Thanks Richard Crowley for your suggestions!
> >>>>>The hum is from speakers, not from the case.
> >>>>>Yes, either of the headsets work OK on another computer.- Hide quoted text -
>
> >>>>- Show quoted text -
>
> >>>Thanks Bob I for your explanation!
> >>>How can the speakers amplify the hum of the little power wart if they
> >>>are disconnected by the insertion of the head phones?
> >>>A Sony ECM-T6 microphone and another desk-top microphone don't hum! A
> >>>new Koss sb/45 headset and Philips SBC HM300 headset hum from their
> >>>microphones.
> >>>How to make Koss sb/45 headset microphone work?
> >>>Best regards,
> >>>Dima
>
> >>The speakers are only disconnected from the audio source, the "wall
> >>wart" is still powering the speakers amplifier. Try turning the volume
> >>knob down or unplug the speakers little power supply.
>
> >>- Hide quoted text -
>
> >>- Show quoted text -- Hide quoted text -
>
> >>- Show quoted text -
>
> > Thanks Bob I for your explanation!
> > The speakers are in a headset. There are no other speakers. A "wall
> > wart" is not powering a headset.
> > Why does the hum appear from a headset microphone only, not from a
> > separate microphone?
> > Best regards,
> > Dima
>
> The confusion comes from the misuse of the term "speaker". The sound
> producing components in a headset are called "headphones" or "earphones"
> not "speakers", the condition I described applies to powered speakers
> not headphones or earphones.- Hide quoted text -
>
> - Show quoted text -
Thanks Bob I for replying!

On Oct 19, 4:40 pm, Bob I <bire...******.com> wrote:
> D wrote:
> > On Oct 19, 1:37 am, Bob I <bire...******.com> wrote:
>
> >>D wrote:
>
> >>>On Oct 17, 10:13 pm, Bob I <bire...******.com> wrote:
>
> >>>>The problem is likely caused by the combination of "speakers" being
> >>>>disconnected by the insertion of the head phones AND the volume knob of
> >>>>the speakers being cranked up rather high. Now the speakers are
> >>>>amplifying the hum of the little power wart.
>
> >>>>D wrote:
>
> >>>>>On Oct 17, 1:44 am, "Richard Crowley" <rcrow...@xp7rt.net> wrote:
>
> >>>>>>"D" wrote ...
>
> >>>>>>>It does not hum when no headset is plugged in.
>
> >>>>>>Then you can eliminate any problem with the computer,
> >>>>>>the sound card, or any software including drivers, etc.
>
> >>>>>>>One of the headsets is brand new and checked.
>
> >>>>>>What does "checked" mean? Do either of the headsets work
> >>>>>>OK on another computer?
>
> >>>>>>>Yes, the hum changes when I move the headset around the room: the
> >>>>>>>further from the computer case the louder.
>
> >>>>>>I would take a wild guess that it has a shielding or grounding problem.
>
> >>>>>>>Yes, it hums when I try using a differen computer mic: both headsets.
>
> >>>>>>The problem may be with the basic design if both headsets
> >>>>>>show the same symptoms.
>
> >>>>>Thanks Richard Crowley for your suggestions!
> >>>>>The hum is from speakers, not from the case.
> >>>>>Yes, either of the headsets work OK on another computer.- Hide quoted text -
>
> >>>>- Show quoted text -
>
> >>>Thanks Bob I for your explanation!
> >>>How can the speakers amplify the hum of the little power wart if they
> >>>are disconnected by the insertion of the head phones?
> >>>A Sony ECM-T6 microphone and another desk-top microphone don't hum! A
> >>>new Koss sb/45 headset and Philips SBC HM300 headset hum from their
> >>>microphones.
> >>>How to make Koss sb/45 headset microphone work?
> >>>Best regards,
> >>>Dima
>
> >>The speakers are only disconnected from the audio source, the "wall
> >>wart" is still powering the speakers amplifier. Try turning the volume
> >>knob down or unplug the speakers little power supply.
>
> >>- Hide quoted text -
>
> >>- Show quoted text -- Hide quoted text -
>
> >>- Show quoted text -
>
> > Thanks Bob I for your explanation!
> > The speakers are in a headset. There are no other speakers. A "wall
> > wart" is not powering a headset.
> > Why does the hum appear from a headset microphone only, not from a
> > separate microphone?
> > Best regards,
> > Dima
>
> The confusion comes from the misuse of the term "speaker". The sound
> producing components in a headset are called "headphones" or "earphones"
> not "speakers", the condition I described applies to powered speakers
> not headphones or earphones.- Hide quoted text -
>
> - Show quoted text -
Hello!
The headsets hum from their microphones even through another sound
card Creative SB 16, although they do not hum on another computer.
How to prevent the hum?
Best regards,
Dima

Aren't we over this discussion, it really isn't one for a pro audio group.
Please stop cross posting.
--
Martin Harrington
Lend An Ear Sound
Sydney Australia
0414 913 247
"D" <tarb@bk.ru> wrote in message
news:1192821296.145466.46540@i13g2000prf.googlegro ups.com...
> On Oct 19, 4:40 pm, Bob I <bire...******.com> wrote:
>> D wrote:
>> > On Oct 19, 1:37 am, Bob I <bire...******.com> wrote:
>>
>> >>D wrote:
>>
>> >>>On Oct 17, 10:13 pm, Bob I <bire...******.com> wrote:
>>
>> >>>>The problem is likely caused by the combination of "speakers" being
>> >>>>disconnected by the insertion of the head phones AND the volume knob
>> >>>>of
>> >>>>the speakers being cranked up rather high. Now the speakers are
>> >>>>amplifying the hum of the little power wart.
>>
>> >>>>D wrote:
>>
>> >>>>>On Oct 17, 1:44 am, "Richard Crowley" <rcrow...@xp7rt.net> wrote:
>>
>> >>>>>>"D" wrote ...
>>
>> >>>>>>>It does not hum when no headset is plugged in.
>>
>> >>>>>>Then you can eliminate any problem with the computer,
>> >>>>>>the sound card, or any software including drivers, etc.
>>
>> >>>>>>>One of the headsets is brand new and checked.
>>
>> >>>>>>What does "checked" mean? Do either of the headsets work
>> >>>>>>OK on another computer?
>>
>> >>>>>>>Yes, the hum changes when I move the headset around the room: the
>> >>>>>>>further from the computer case the louder.
>>
>> >>>>>>I would take a wild guess that it has a shielding or grounding
>> >>>>>>problem.
>>
>> >>>>>>>Yes, it hums when I try using a differen computer mic: both
>> >>>>>>>headsets.
>>
>> >>>>>>The problem may be with the basic design if both headsets
>> >>>>>>show the same symptoms.
>>
>> >>>>>Thanks Richard Crowley for your suggestions!
>> >>>>>The hum is from speakers, not from the case.
>> >>>>>Yes, either of the headsets work OK on another computer.- Hide
>> >>>>>quoted text -
>>
>> >>>>- Show quoted text -
>>
>> >>>Thanks Bob I for your explanation!
>> >>>How can the speakers amplify the hum of the little power wart if they
>> >>>are disconnected by the insertion of the head phones?
>> >>>A Sony ECM-T6 microphone and another desk-top microphone don't hum! A
>> >>>new Koss sb/45 headset and Philips SBC HM300 headset hum from their
>> >>>microphones.
>> >>>How to make Koss sb/45 headset microphone work?
>> >>>Best regards,
>> >>>Dima
>>
>> >>The speakers are only disconnected from the audio source, the "wall
>> >>wart" is still powering the speakers amplifier. Try turning the volume
>> >>knob down or unplug the speakers little power supply.
>>
>> >>- Hide quoted text -
>>
>> >>- Show quoted text -- Hide quoted text -
>>
>> >>- Show quoted text -
>>
>> > Thanks Bob I for your explanation!
>> > The speakers are in a headset. There are no other speakers. A "wall
>> > wart" is not powering a headset.
>> > Why does the hum appear from a headset microphone only, not from a
>> > separate microphone?
>> > Best regards,
>> > Dima
>>
>> The confusion comes from the misuse of the term "speaker". The sound
>> producing components in a headset are called "headphones" or "earphones"
>> not "speakers", the condition I described applies to powered speakers
>> not headphones or earphones.- Hide quoted text -
>>
>> - Show quoted text -
> Hello!
> The headsets hum from their microphones even through another sound
> card Creative SB 16, although they do not hum on another computer.
> How to prevent the hum?
> Best regards,
> Dima
>