Do I need to replace my factory amplifier or head unit to install the Stage One?
No, you don't. Because we've carefully selected the speakers used in our Stage One Audio Upgrade, they're optimized to sound great with your factory amplifier. Even though many customers approach us with the idea that they would like an amplifier upgrade, the vast majority of those who install our Stage One are incredibly happy with the upgrade, and never think about an amp upgrade after it's installed.