4 Speakers?

i just recently got a logitech speaker system, with one sub and 2 speakers for my pc. Now the sub only has 2 outputs for speakers, my question is, is it possible to add 2 more speakers to this system totalling 4 speakers, is there something i need to do this?

you could strip the plastic off your speakers and attach another but you would be getting the same sounds out of 2 speakers so it isnt real surround sound

You can buy adapters which will convert the speaker output connector two two outputs (if it uses a standard RCA output like my z-5300's), and then attach two more speakers. Although I'm not sure why you would want to do that, as it would lower the output power for each speaker, and it wouldn't be surround sound if thats what you're thinking.

Then, That would be Quadrophonic, Not 5.1 Surround, because you don't have a central channel. You will have front and rear, but It won't run in surround, but quadrophonic sounds much like surround.