Hope I don't start a war for posting an AA link but I think its worth looking at.http://www.audioasylum.com/forums/HUG/messages/65936.html
Basically about pro drivers not becoming "alive" until louder levels. The thread is mostly about JBL drivers, newer 2226/2206 vs 2204/2205. They seem to think the older ones sound better at low levels because the surround and spider is not so tough. I think some people affiliated with JBL also said this according to one of the guys who responded, nickname "mikebake"
Wayne, I know you've used a lot of JBL drivers. Have you got any comments on this?