I replaced the diaphragms in a pair of Heresy tweeters and listened after- for newer music, the highs weren't great but for the music from the time they were designed, they sounded really good. That time was the late-'50s and there was no 20KHz+ response in music sources, no hot-sounding mixes, no sub-bass and the musical styles didn't need those- I listened to some '50s Jazz and they really were made for that.\n\nOnce I listened and had noticed the lack of extension on both ends, I looked up the specs, then used an RTA app- the measured response was in agreement with the spec sheet- 50Hz-17Khz.\n\nI don't necessarily have a problem with speakers that can't go below 50hz, we have great subs these days that can solve that issue. Nor do i necessarily have a problem with the 17khz cutoff, not a whole lot of content beyond that, and many can't hear it anyways.\n\nWhere i do have the problem with them is, they just sound terrible. They could have at the very least used better quality drivers. But to charge outrageous prices like these are some exotic speakers and are going to change your world is just taking advantage of their past reputation.\n\nWhat you say about the Jazz music, i can somewhat see. I just don't understand why some people still have not grasped the concept, that a speaker should sound good for any and all music. When people see these Youtube reviews talking about how a speaker really sounds good for this or that type of music, it should be your first clue. Stay away from that speaker.