Verified answer

they will generally put out the same amount of power. the difference if there is one will be too minimal to hear.

if you have two different types of subs hooked up to it and one is louder than the other, then it is probably more sensitive then the other one which means it is louder on the same amount of power. if they are the same exact woofers, then check your wiring, and make sure one isn't damaged or blown