Hi guys first post on this forum :). I recently buy a nice pair of klipsch heresy, they look old to me, I expected to have alnico magnets. On the back label it's written HBR and once opened up I found ferrite magnets, and I was surprise. On the drivers I read k-77-something-i-cant-read, K-53-K, K-22-K. Crossover type E. Are they model I, model II or just HBR or a model II variation? And are they more or less valuable than an alnico magnet serie? Are they 96 or 99 db efficency? Be gratefull if somebody will be able to answer. I am curious :)
