It's something I meant to add earlier, but I wasn't getting a good connection to the forum. Yes. Simon is right, it is possible to design a bass cab with a very short but large port on the rear that looks for all the world like an open back. It doesn't behave like one though.
It's almost a rule of bass cabs that speaker area is the key to volume or sound. If you
a) have the space and
b) don't have to transport it
then the most cost effective way to get more out of that amp is to pick up an old school heavy bass cab, at least one 15 or two tens, and plumb it into that. In many areas things like old school 4x10s are available on the secondhand market for less than the cost of a single new driver, and you'll be amazed how much more a little low power amp will deliver through a big cab.
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