I'll just note that one can read reports of super-tweeters improving subjective bass performance (e.g., https://theartofsound.net/forum/showthread.php?46702-Supertweeters)... so it is possible for the perception of bass to be impacted by devices which only affect higher frequencies.So clearly the ZR panels do something to improve the bass - what, beyond what the manufacturer says I don't know. And I don't think Hanson Hsu is going to reveal any more than he already has. He seems to be very smart about protecting his trade secrets.