Hi!
All I can really do at this point is tell you a little bit about connections and cables. Since I don't own what you're about to buy I can't say what it uses.
Here are a few scenarios (might be a combination of different connections so feel free to mix & match everything I'm about to write).
1. Wiring. Used mainly on hi-fi systems and passive speakers of all sort. Usually a standard red and black (although sometimes there are more) wires labeled "+" and "-".
If thats the case than you can't connect the Micro Korg directly to the speakers since there is no odd type of adaptor (nor there should be really) from a standard 1/4 inch cable to a hi-fi speaker power wiring. If the wiring is used to connect to the speakers then you need to connect directly to the amplifier itself which then connects to speakers.
2. Amplifiers and mixers. Usually it's pretty straight forward. Most amplifiers sport an RCA L/R inputs. If that's the case you will simply need a 1/4 inch to RCA cable. Two of them to be precise. Or one stereo L/R interleaved cable. Nothing crazy. Any Radio Shack or Music store should have a few knocking around.
Higher end amplifiers use 1/4 inch or XLR connections. Meaning that in case of it being 1/4 inch you won't need any kind of adaptors. However if the input on the amplifier is XLR you will need a 1/4 inch to XLR adaptor for each cable or a pair of 1/4 inch to XLR cables. Or an interleaved stereo 1/4 inch to XLR cable. Somehow I don't think you'll need to mess with XLR connectors though. They are only found on high end stuff.
3. Now that I've confused the shit out of you with all that info you should really talk to ownners and clarify several things. First find out if the speakers are self powered. Second find out how it all connects to your Micro Korg (or any KB for that matter since all KBs use a standard 1/4 inch output jacks).
My tannoy 600A are self powered so they do not really require a mixer to connect to one sound source. THey have a connector that allows use of both 1/4 and XLR cables.
-ED-