There is absolutely NOTHING new or revolutionary about the newer series. These spkrs are DIFFERENT - modified drivers and hence a different crossover configuration. Almost identical cabinet. The crossover is simplified - hence the newer speakers are less NEUTRAL. Wether the new series are BETTER is yet another question that to ME does not have an answer. Let us say they are DIFFERENT speakers. A big + is that due to the simplified crossover better results can be achieved with a lesser amp...
