This is a old disscussion..but i can help myself.

First of all the emitters don`t lack any durability....the problem why these units fried was nit due to the fact the Emitters were weak,,,,let me tell you one secret ladys and gents.. the key for the classics is as follow

CONTROL is the most important thing with a kappa 9 [this speaker is otherwise know as a AMPKILLER] Iff you have drive these speakers with enough power,,,that most haven`t done because of the money it costs this is the reason that you destroy the tweeters The 4xemit and 2xsemit [both speakers] don`t ask much but the need the right control to preform flawless...why? very simpel iff your can`t handel the power the demand it will clip [yes even when you think it`s not] the emit units are capable to go as far as 45khz.. eat that for a change!!!

The kappasereis is a extremely difficult speaker to drive correctly...specially the kappa 9 this speaker will kill most amps...This is a BI-AMP speaker ladys...@33hz 0,8ohm...says enough i think The newer kappas [made under the HK flag] are nothing compared to the classics.....In the audioworld the kappas-series [Arnie nudell] are famous for there preformance. The are never surpassed by the new ones

The problem of the Arnie nudell speakers were very simpel...very difficult to drive..
Does the name WATKINS say anything to you all??!!?!!

I can go on and on and on about the facts of infinity classics....

One thing tho...the man who said the kappa 9 has the last emit units produced... NOPE the epsilon and sigma!

EHEHEehhee teh last mails were correct here BTW,,,Greetz Muziekfreak

PS i own a pair of kappa 9 speakers...the just sound glorieus