hum on USB headset mic?

[Brent Harding]

Hi there. I've been using a Plantronics DSP-400 USB headset mic for quite a 
long time now. I got another one for Christmas a few years ago that I 
decided to try yesterday because the foam on the left earpiece is just about 
all gone. That one never had any audio problems for me recording, but this 
one I just opened has hum when I record. I think it's just a little bit, but 
when you do net radio and stuff that applies processing, that sound will 
become more apparent. I plugged the old one back in to get rid of the hum 
even though it's getting uncomfortable to wear. How can I get rid of the hum 
so I can use this new one, or did I just end up with a defective one? I know 
I can't return it any more because that model isn't made any more and it's a 
few years old. Why would a new one of the same model record hum and this old 
one I've been using for about 4 years now doesn't? I thought hum would be an 
unusual thing with USB headsets. Is there any way around it. I'd hate to buy 
a bunch of USB headsets and have to return them to find one that doesn't hum 
as it's important to me to have a somewhat clean recording. I use Skype for 
some of those phone systems where you have to say what you want and noise 
like that may screw up the voice recognition. I can't take the cables off as 
they're built in, so is there anything that can be done, or did I end up 
with a defective one?

Thanks.

To unsubscribe from this list, send a blank email to:
pc-audio-unsubscr...@pc-audio.org