I haven't heard the BS22s, only my BS41s which I also found a little boomy. It seems that this is not uncommon with un-broken-in speakers, for which the intended cabinet bass tuning does not fall into place until the fs of the bass driver has dropped as it does during the break in process. I tamed the boom on mine with a wad of the smallest straight drinking straws I could find cut in half and stuffed tight into the port. This provides a rudimentary type of "resistive port" and tames the resonance. After enough time has elapsed that the bass/mid driver should be broken in, I'll remove the straws and see if the boom's still there.