X-Fi & Logitech Z 5500 problem ...

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Hi all,

I have the following problem explained bellow (it is kind of long email),
any ideas?

My System:

- Creative XFi platinum installed on Dell Precision 670
- Logitech Z 5500
- SpeedLink Headset


The first day with Z 5500 everything worked just great. The day after
when connected and started the computer there was a horrible noise.
To start troubleshooting I went through all the power suggestions but they
did not work the noisy sound and humming was still there.

Then I noticed the problem was the connection of the microphone line
coming out of the Xfi card. If I completely disconnect the microphone line
then the noise goes away. I need the microphone line to connect to my
so I can switch between Z5500 and the headset anytime I need to e.g. using

How can I avoid the noise and still keep my headset connected to the
sound card? why this problem came out the day after and not the first
time I connected everything? as far as I can tell nothing changed from
day one to the day after ...

Quoted text here. Click to load it

B and C are definitely not the problem. I have tried moving away the Z 5500
from any other
electronic devices like PC etc and even plugging into a different and
isolated power outlet the
noise effect is still the same.

Regarding A I also checked that the Sound Card is properly connected to the
MOBO and
that all 4 connectors (Microphone + 3 Z5500 inputs) are properly connected.

Bellow please find more info for the diagnostic:

1-. When I connect the SpeedLink headset to the "Control Pod" there is NO
noise of any
     kind coming from the headset. Hence it shows that the problem is NOT
the Xfi Sound
    Card otherwise I would get the same  noices from the headset too, right?

2-. When I keep the Microphone "Volume Control" not muted from Windows and
     the Speedlink  Headphones from the Xfi Microphone output there is still
a noise that is
     not sooo bad as when the Headphones are connected to Microphone output
of the Xfi card.

3-. When I mute the Microphone from the Windows "Volume Control" from System
tray, the
      main and lauder humming/buzzing coming from all speakers and Subwoofer
stops. However,
      even when the microphone  is muted there still remain some very low
but still bothering buzzing
     coming from the Z 5500 speakers  but not from the Subwoofer. However
note that when the
     Headset is connected to the Z 5500 Control Pod  there is still no noise
of any kind ... again
     meaning the problem here is not really the Sound Card.

4-. When the Microphone is muted from the Windows "Volume Control" I get
some (is it
     normal?) minor buzzing from the speakers only that reduces with the
Volume control of
     the Z 5500 "Control Pod". When I change the Z 5500 "Control Pod" effect
from "6 Ch Direct"
     to any other like e.g. PLII Music effect mode then all buzzing/humming
stop completely.

please note that the only mode that brings the noise problems in different
levels is the
"6 Ch Direct" all other Effect modes work OKAY.

My configuration is as follows:

- Creative SoundBlaster XFi Sound Card platinum (includes the front panel
that I actually don't
  have connected  to anything).

- The Headset Speed link that connects to the direct Microphone output of
the Xfi Sound Card. It
   still has a connector left to connect the Headset to the Z 5500 "Control
Pod" and work in "Headphones

- The 3 remaining sound outputs go directly connected to the Z 5500 "Control

Still not clear to me why the first day there were aboslutely no problems,
but these issues started
late the second day. Is it possible this was a defective Z 5500?


Thanks in advance,
Best Regards,

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