I have liquid audio tower speakers, they are the Polk Momo MCC 650, they are loud and you can hear the music when your riding, not clear or anything, but you can tell what song is on. I think for the price they are pretty good.
I have the polk DB6500 they sound good I am pushing 75 watts RMS to each one. I can hear them 75' back also. Check the profile pick or my install post.