if you are on the original RCD300, That will be your biggest weak point on our cars.
upgrading to an RCD310 is a big step up.
However if you are willing to jump into Alpine/Pioneers radio's etc. That will be an even bigger jump in sound Quality.
Otherwise, installing an Amplifier to the stock speakers with Stock radio will also be a good bump in improved sound quality.
Going to the likes of aftermarket speakers with your factory radio, would sound slightly better at low volume, but at a volume most people would listen to it would sound terrible.
The factory Radio's simply cannot produce enough power or efficiency to make replacement speakers sound justifiable to the money spent.
