They are just so so, dont expect to shake the guys car next to you. I think they are like 200-250 watts rms, so thats not too bad for powering a small sub. If its just about trunk space, they do have these new subs, not sure what brand, that are only like 3-4 inches deep. They dont need a tremendous amount of box space either. Might be something work looking into if trunk space is your only concern.