What's the best way to upgrade my Toyota Highlander's sound system?

I've been wanting to improve the sound quality in my Toyota Highlander, but I'm not sure where to start. Should I replace the speakers or add a subwoofer? And will it require any special tools or expertise? I really want to get the best sound possible without spending a fortune.

Adding a subwoofer is the best way to upgrade your Highlander's sound system. It will give you a fuller range of bass and improve overall sound quality. You can find easy to install subwoofers specifically designed for your vehicle model.

Replacing the speakers can also make a big difference. Look for high-quality speakers that are compatible with your Highlander. You may need some basic tools and knowledge of car audio installation to do this yourself, or you can take it to a professional.

If you want to upgrade your sound system without spending too much, you can also try adding a Bluetooth or auxiliary adapter. This will allow you to stream music from your phone or other devices and improve overall sound quality.