the stock speakers are very low rated only 20W ( probably RMS) and made of plastic with a tiny magnet. Not exactly made for loudness or quality sound. Buy yourself a new set on component speakers, its an easy job and will make a lot of difference. Focal get get reviews here and for £125 or more you'll do alright. Focal are good because they have multiple mounting holes and the stock speakers only have 3 whereas most speakers with have 4. The focal are easier to fit because of this. Other makes will need some adapter rings to allow for the 4 holes.