What this proves is that you hear a difference between your particular magnetic levitation system and your particular "contact based" support system, in favor of the former. From this sort of one-off experiment it is perhaps premature to generalize, but we all do it nevertheless. It is at least worthwhile to listen for a while with the maglev and then go back to the previous shelf system, to see for yourself whether the benefit of mag lev that is apparent at first listen is a real and lasting one.