Tweeters and crossovers
Welcome to the Harbeth family.
As hifi_dave says, there were indeed some very nasty metal dome tweeters in the 80s. But actually it was the deadly combination of a theoretical crossover design + the inherent characteristics of those domes that created a horrible sonic combination. If speaker designers in that era had thrown out the theory and got down to some proper listening (on speech would have told them all they needed to know) they could have greatly ameliorated the hardness with a sympathetic crossover design to work around - or rather, work with the mechanical design of the tweeter.
I keep meaning to make a tech talk or two about crossover design and how simulations can help - but in the absence of appreciative feedback I'm not to sure if it's the best use of my time. I'll put it on the ever expanding list!
Alan A. Shaw
Harbeth Audio UK