Yes they are the old BSR cabinets. I removed the high pass filter and changed the driver out for a better one. The problem I have now is the cabinet literally is not heavy enough and the down firing driver wants to propel the whole box into the air. It is almost possible to get it off the ground with Blue Man Group before the 15amp breaker goes. Now I know why so many sub-woofer makers put amps in the subs, not because it's better sonically, but it's heaver. I will have to add some ballast in the near future.