The K-42EV woofers are amazing. Not that they have huge bass, but their clarity in vocals is quite awesome. It's my understanding that the autoformer is "hot" in the HIPs compared to standared Heresy's and they deliver a huge midrange punch. I have not heard them with standard tweeters, so I can't compare that, but I know I'm hearing high notes that I've not heard before. My system is by no means audiophile. It's in my garage shop. I've got my HIPs sitting on top of a pair of LaScala Industrials coming off a Denon dra800h 2.1 receiver and the combo sounds mighty fine to my uncultured ears.