Weak amp + strong speaker = lacking sound

Powerful amp + weak speaker = comparibly cheap sound and risking a blowout or something

Weak amp + weak speaker = good setup, weak performer but compatible

Powerful amp + powerful speaker = loud clear sound, compatible, and a performer too


Larger subs move more air and have a heavier cone, therefore moving slower and covering lower frequencies that a smaller sub wouldn't probably put out. You'll get shakier, more defined bass with a larger speaker than a smaller. But you don't need to go all out on it. Keep in mind the size of your car and what you need. After all, there isn't that much air in a small car.