long ago, i saw a huge speaker in a cab w/ a horn at paragon music in tampa, fl. this thing could have been well over 20 inches if memory serves, although that was just eyeballin' it and never asked about the specs. over the years, i've dreamt of the sick levels of bass i could emit with this thing, and got to wondering....what's the biggest practical speaker size for bass? anyone ever used a massive speaker? seen one?