EggXpert

I got curious today and started looking around at speakers, and one i found was the Logitech X-530. It seems like a good surround system, but I have a few questions. I have no sound card currently, just the 3.5mm jacks on my case and on my rear I/O panel (ASUS P5N-E SLI Motherboard). So my question is would I need a sound card for these speakers? ...