Do you want to keep the subwoofer and use different set of speaker in the same system?
If that is the case, you will need to find out what ohm of speaker it supports.
Then you can buy passive speaker matching same resistance (ohm) and power.
I am also looking to replace/repair my broken satellites speakers of Z-5500. They are rated at 3" 62w RMS a@ 8 Ohm. I couldn't find the replacement in market.
Got any solutions?