My new speakers are worse than the old ones?

Hello,but I bought new speakers yesterday. Previously the original Omega B speakers were in there. The new ones are not the best ones but should be enoughhttp://www.caraudio-store.de/product_info.php?products_id=8121 Autoradio is original CD 500 or so I’m not sure Now to my problem, if you turn the system a bit louder, the speakers sound so terrible. So they sound almost as bad as my original speakers.Only the new ones have 80 watts more power than the old ones. Why is that?Because it can’t be that the new ones are just as bad as my old 30 watt speakers? Is it perhaps due to my car radio? Would I look forward to a few answers =) I’m really disappointed and for that I have also spent 50euro. I hope you can help me further Thanks