Ah now this is a piece I'm proud of. I computer designed this to THE SMALLEST possible bass box - monitor. It goes all the way down to 40hz- bottom E on the bass guitar. Its tiny for a bass box (that is a CD case in the pic on the left to give you a sense of scale)
Best of all the bass port can be pushed in for transport and just pulled up for performance. I used this in a band where I played a bass-piano split and sang. It kicks butt and won't break your back. Has 300w driver @ 93db efficiency.
$150