Ceramic drivers do sound dry, and ring a bit at high volumes, esp when partnered with wrong equipment usally SS amps
I agree - what you say is "generally" true of rigid light weight drivers, however, as Mike points out - the C79/6 accutons are extremely good because of the rubber dots which apparently help reduce the out of band ringing below audibility (they are not just ceramic). Just a bit limited dynamically thats all - otherwise one of the best drivers in the world and used on several top of the line speakers. They have a nice flat response and very low distortion.