Well, all over this board, everyone seems to agree that Audiobahn sucks. Crappy SQ, but I guess they're supposed to be loud. If you just want loud, and now SQ, I suppose they'd be OK. Some people say the Q series is good though.
for the price of 1 12" sub from audiobahn you could buy two 12s from a ton of MUCH better companies. even if your just looking for SPL you could find cheaper but better subs. whats your price range and what are you exactly lookin for?
if you want just some daily driver subs...look at kicker compvrs...they are well within your price range.
also JL w3v2's, adire shivas, and eD's...they are also good....(i would go w/ the shivas ir i where in your shoes...$250 a pair)
The sound quality subs are pretty good IMO. But like someone said, they require alot of rms to make them sound good. In a smaller box the sound quality is good and in a larger ported box they get pretty loud but lose a ton of sq