Hi,
If you think your speakers are very nice quality then I doubt very much if they are the original speakers. Mine are still the factory fitted ones and are cheap and nasty . The speakers in my wifes citroen C3 are far superior! I intend to change them as soon as I can. I understand that you could get a factory upgrade which included a bigger amp and perhaps this included better speakers,but some of the other guys may put me right.
Regards
Keith