What are Your Favorite Tweeters?

The tweeter that impressed me the most was one that seemed to not be there at all--it was so smooth and unobtrusive and high frequencies were present without calling attention to their presence.  The tweeter is a G.I.P Laboratories reproduction of the Western Electric 597 tweeter (field coil compression tweeter with a horn).  It sounded at least as good as the original 597 tweeters that I've heard.  The big downside is that both original and G.I.P. reproductions are quite expensive.  I briefly heard the G.I.P. 9501 tweeter (original design, not a reproduction) that is based on the 597, but, it was in a custom built system that had not yet been properly tuned, so I cannot say if this tweeter is even better; it is certainly much more expensive at $60,000 for the pair.

I never heard the Boressen; now I am interested in hearing something with that tweeter.

Another tweeter that I've heard in a terrific sounding system is the Murata supertweeter. 

Speakermaster,

The t 35 is a nice tweeter. A local builder finds those and uses them in current project.  Another vintage tweeter that he uses is the Jensen RP302.  I particularly liked an open baffle system he built with a Jensen M10 fieldcoil fullrange driver and an RP 302 tweeter.  But, I am sure the field coil Western Electric 597 tweeter would be a substantial, albeit very expensive, upgrade.  This is sort of a dream system for me, although I do not like the inconvenience of having to turn on and adjust power supplies to speakers.