those little cast aluminum things that use 50 watts,are they good would they be better than something like 6.5 mid woofers like kicker freeair or jl6w0 , curious what they are like

 

the bass shkers are not actual speakers. The vibrate to give the feeling of having more bass in the car. If you are using them with subs, they make the seats shake like you had a more powerful system, bt with the subs off, or no subs, they simply add to the rattles of the car.