How to improve the sound system in a BMW 4 Series?

I recently purchased a BMW 4 Series and I'm not satisfied with the sound quality of the speakers. Is there a way to upgrade the sound system without losing the original design of the car?

One option would be to install aftermarket speakers that are specifically designed for BMWs. This way, you can improve the sound quality without altering the car's original design.

Another solution would be to add a subwoofer to your current sound system. This can enhance the bass and overall sound quality, without major modifications to the car.

If you want to really elevate your sound experience, consider adding a DSP (digital signal processor) to your system. This can fine tune the audio output and give you more control over the sound settings.