Can you install a sub without an amp?

Subwoofers are designed to increase the bass frequencies, resulting in a deep, thumping sound. In most cases, they are paired with an amplifier to boost the sound. If you do not have the funds for both components, you can still hook up a subwoofer without an amplifier; it simply involves a little more know-how.

How do I know what amp to get for my car?

If you experience distortion at your desired volume level, you probably need an amplifier. To power a subwoofer: When you add a subwoofer to a car audio system, you almost always need to add an amplifier at the same time.