I sell Fluid Concepts, one of the best speakers I have ever seen,
www.fluidconcepts.net.
the are smaller than Boss or Mako. they have taken up a slightly different approach to building tower speakers than most of the competition. It is fluids philosophy that tower speakers should be loud, clean, and as small a possible. they go through great lengths to make sure that the speakers don't sound like speakers stuffed into a metal can. Just open one up and you can see the difference! they have custom gaskets and custom sound dampeners etc. Also don't believe that tower speakers (of this size 6"-6.5") should reproduce bass since the since that is not what the speakers are designed for and rider will never hear it!! they leave the bass up to the subwoofers inside the boat.