Return them. These probably can be categorized into the "cube" category. I also suspect that the specs are overstated as far as extension. I recently replaced B25 rears with the B1s, and my Audyssey XT calibration found the roll-off to be at 90hz, even if PSB states 65hz.
The only real reason I used these is to have the convenient keyhole mounting with lighter weight from the ceiling.
Otherwise, what I basically say every darn time I see a PSB Alpha thread is to avoid them in favor of the Image line. You can get a new pair of Image bookshelves for $259 from either Saturday Audio or DMC Electronics, for example.
I don't know how large of a sum $60 is to you, but it's most definitely worth it in this scenario. Back in the days when these lines were relatively new, the price point difference was much, much more pronounced.
Otherwise, if you are patient, you can every once in a while land a pair of the larger Alphas, the B1s, for about $100 on the classifieds. But, again, the Image upgrade is very well worth it if you are sticking with PSB. It's not even in the same ballpark. I've heard them side by side off the same electronics. If I was blindfolded, I'd probably end up being shocked to find out they were even built by the same manufacturer. JMO and guess.