Audiophiles hifi appreciation thread old and new

Hi everyone, I've got a sony mhc-3600 mini hifi system which has 4 speaker outputs for the speakers (ss-h3600) that came with it: they are marked 'satellite unit' and 'subwoofer unit'.

Basically I'm pretty sure the bass is blown on them and was wondering what i could replace the existing speakers with: would I have to replace like for like or would I be able to use any speakers?

Is it the sub which you think is faulty?