Factory speakers aren't usually up to the mark. Install after market features that meet similar dimensions and play nicely with your car's head unit.
Music quality is usually compromised when played through a phone oran MP3 player. Find a replacement head unit it has a USB connection.
Factory car audio systems are over simplified. Try to add components like a new amplifier, signal processor, or equalizer.
If you're listening to digital music, sound quality can suffer due to overly compressed files. Use bigger, less compressed music files.
Use damping materials such as dynamites, mats, and heat shield sunder the hood or on the doors to minimize noise.