I have some experience with the older Hafler mag-coupled 200 watt/ch cubes. Small, powerful, and surprisingly stable. Had one friend who used them with a set JBL L series, and another who drove a pair of magnapans to surpisingly loud volumes with his. In college I had a friend who had one with the "sonic holography" function but I was unimpressed. I am not familiar with the 500, but I am sure it couldn't be bad. yeah, those Ohms are pretty raggedy. Originally had them for 175 plus 100 for shipping out of NC.