why the front speakers/channels have no output

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I am having problems taking full advantage of my system's audio
capabilities.  I have a system with the following configurations,
hardware, and software settings:

Pentium 4 (3GHz, 1GB RAM)
Windows XP Home Edition, Version 2002, Service Pack 2

Sound Card:
SoundBlaster Audigy 2 ZS [A400]
Driver release:  release 2.9.16 (re-installed to ensure that it is not

Logitech Z-5300 Speakers
Source selector switch:  5.1
Matrix:  on

Audio Software:
Creative Audio Console:
Speakers:  5.1 Speakers (synchronized with MS Windows Control Panel)

Control Panel - Sounds and Audio Devices
Speaker Settings:  Speaker Setup:  5.1 surround sound speakers

When listening to music - .mp3 or .wav (off a CD) - or a DVD, or
playing material via iTunes (music and video), the front speakers/
channels (left and right) not producing any sound.  Center speaker/
channel is playing about 80 percent of non-sub-woofer audio (operating
normally), with the rear speakers/channels (both left and right)
producing the other 20 percent.

I'm trying to determine why the front speakers/channels have no

All the wires/plugs are connected properly.  All the hardware
configurations and software settings appear to be correct.  I've
reinstalled the sound card driver and audio software (WinAmp).  I just
cannot figure out why there is no front speaker/channel sound.

Can anyone help me?

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