At AVS Forum I noticed the mentioning of a 'free resonant' speaker system. This was in a thread called 'harmonic structures' in the AV improvements section, which I didn't really understand at all. At that forum I've read things about stuff like 'tunable rooms' and the like... but I'm really curious about how such a system would work. Anyway, one poster said "The Yale and Columbia University music departments visited my home to take a listen and they left scratching their heads. They had never experienced anything like what they heard in an "ordinary" room in a house, acoustically treated with PZCs, mechanically tuned components and using free resonant speakers." Also, "All I can tell you is that these free resonant speakers are the most "neutral" (for lack of a better word) sounding speakers I have ever experienced in over 30 years in this hobby." So what the heck is a free resonant speaker? Isn't a speaker not supposed to resonate? Or am I missing something?