Quote Originally Posted by 57charles View Post
Walpurgis, I can assure you they were.
Hmm. I'm assuming these are an HD100 D25 variant. If so, I see no mention of ferrofluid in the spec. This model dates back to the seventies and ferrofluid was not in general use then. (which is why I like old tweeters)

I'm talking about Martyn's MLS4's by the way.