Is there anyone else that can help with the actual problem we are dealing with, not just recommending subs
We are trying to figure out if he hooks the sub to the sub output and the front output to the z-2300s on the sound card will he still get bass on the z-2300s
I apologize
(<- I have no idea what I put that smilie there
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To use original speakers + the new "subs":
Buy 3.5mm Splitter ("Headphone Splitter")
Buy 3.5mm to RCA coverter
^ Both should run shipped less than $5.
Figure out how much you want to spend on the subs. And how loud you want to be. 3 main type of boxes (make an huge difference):
Ported, Sealed, Bandpass. Bandpass being the most... loudest, consisting of a sealed partition and a ported partition.
Then you start to look for the subs. Avoid brands such as: Pyrmid, Pyle, Radioshack, Dual, Roadmaster, VR3, if you intend for true "hard-hitting" bass.
Go into something more known, Kicker Competitions, MTX, JBL, JL Audio, Pioneer... even Kenwood is alright
Amplifier - Pricey, don't overpower your subs.