Ah, good to know
I've been reading more about the Sierra-1, and I've uncovered reports of it being on the bright side, from 2007 and 2008... not sure if the current version is any different, and not sure if they were using the Nhr tweeter or not. One of the sources was some 20 person blind listening get together, where the Swan D2.1 I think it was, came out on top.
I wish there was an internet speaker database equivalence to IMDB for movies, where speakers were rated on a number of qualities including warmth/brightness.
Another thread said that there wasn't much of a night and day difference between the Sierra-1 and AV123 ELT525 towers, with the towers being smoother. Makes me go ARGH!
Here are some user quotes I found while googling ELT525 vs Ascend Sierra