The Raal tweeter several well known builders are getting away from them.
Reason being the 4-5 k range has issues as well as it's Verticle dispertion.
A top dome such as the Scan speak circ arc is noticably more dynamic
I owned a Salk speaker with Amorphous Raal ribbon their best ,very smooth and detailed for dynamics to soft for my taste.not the best for R&R.
Resistors Duelund is now 2 nd Path audio is a 1% and most resolution
Duelund 5-10% no better tolerance . Duelund capacitors Great, But
For a large value cap could be over $1k per speak that is for a simple 1 st order ,a complex 4 th order $1,000s. Fritz uses Clarity ESA which are pretty good,he is also working withthe Clarity MR,as well as Combo with Possibly Mundorf Supreme. These are a premium upgrade $$ if you need the
Ultimate in resolution.