Do I need a splitter?
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Solved by Huginn,
That's strange....
Looking at the I/O shield link, you should get sounds from 4 ports/jacks. You could have a defective mobo, the onboard audio in particular.
Ok, first, get whatever device that have the same 3,5mm jack, something like your mobile phone, or ipod. Try plugging the speakers to that, see if the sub's working. I never fiddled with the Z523, but some 2.1 speakers got a separate button to turn on/off the sub and/or a separate volume knob for the sub/bass. Because sometimes people just wanna use the satellites, without the sub (like in night time, for example). Perhaps the sub is set to off or low volume?
Apparently you have to cranck the bass up. I had set it too low for it to work it seems. Works fine now.

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