In recent times, upgrades have become quite expensive. Today we would like to share with you 4 cheap DIYs and system checks you can try out to improve the sound produced by your car speakers. You could: Use a speaker gasketing tape to create a protective layer. 1. Check polarity 2. Build in tuning-controls. 3. Eliminate rattles. If you have no idea on how to get these done, click here to watch this reference video. Try them out and your speakers should sound livelier than usual!