I built some bk12s with the fostex fe126ens. Not hard to build, if you have enough bar clamps. They do fine with my stereomour and can get louder than I need. However, the low end rolls off below 70 Hz. For most music, a subwoofer is needed. I would expect this to be true of most enclosures for this driver, especially smaller ones. Also, the break in period is long (100+ hours), during which there is even less bass. The strengths of the driver (at least in the blh enclosure) are natural sounding vocals, great imaging, and the feeling that the instruments are in the room with you.