Both posts are correct, to a point. Creative, being creative, made there own digital interface using a 3mm jack. Logitech speakers use coax and optical inputs, while creatives use this 3 mm plug.
Make sure you know your connections so you are not faced with this difficult desicion. I would find a S/C with a coax or optical ouput that supports EAX, rather then using this 3 mm one.
SheepStar