Line Source - to toe in or not?

@erik_squires: Yeah, Danny Richie uses a notch filter to "tame" the ringing in the tweeters (and even midrange/bass drivers) in loudspeakers he is sent. Driver ringing is often also related to frequency response issues, so a filter addresses and helps with both issues.

Stored energy remains a significant failing in many (most?) drivers and the loudspeakers they are used in. I believe that is one reason why I was SO shocked when I heard my first ESL tweeter---the RTR used by David Wilson in his original WAMM, and in the ESS Transtatic I, a pair of which I also own. 

@bdp24 

Theonly way to inow what you are hearing is to measure.

Be tweets have, often, a combination of the best and worst traits.  While there are some really crappy AMT tweets, with terribl frequency response I have never seen any of them javesignificant stored energy

Danny Richie measures loudspeakers in the same way John Atkinson does. One reason Harry Pearson never earned the credibility possessed by J. Gordon Hold was that measurements were not part of TAS reviews. In fact, Pearson lacked the technical knowledge (and gear) required to do so.

If Pearson heard a hint of brightness in the sound of a loudspeaker, was that due to elevated frequency response in the 1kHz-2kHz range, driver ringing, distortion, or all three? Pearson hadn’t a clue. Neither do other purely-subjective reviewers. Measure and listen, as they say.

Thanks for the responses folks, much more enlightened now.

Cheers