hi carl, the accuton drivers *are* the drivers used by kharma, even their top-model, which runs ~$80k/pair (?!?) they're also known as thiel & partner - no relation to thiel in kentucky - these are german. perhaps ewe should check their specs, awailable at orcadesign: http://www.orcadesign.com/accuton/accuton.htm my understanding is that they are lighter, fast w/plenty of motor strength. also, they are ceramic - glass - not metal. their operation is virtually pistonic in nature... regards, doug ps - i guess i could have yust anwsered: carl, you're an idiot!, & left it at that - now *that* would have been productive, eh? ;~)