Ah, that device is a supertweeter, supposeldy good for flat +-3db response to 40KHz. I'm sure I can't hear anything above 15 KHz but some folks say that the harmonics makes the sound you can hear better. DVD Audio puts out music info into the ultrasonic range. Figured I'd give it a try. Dunno. Looks cool. Sounds great!

Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.