cd's/SACDS to test highs?

Have you considered test cd's like Granite Audio or Nordost? They do run through some frequency sweeps among other tests/burn in.

Mob Fidelity SACD, Doobie Bros Captain & Me: play the track Southcity Midnight Lady

That's a demo track fo sho

Thanks, for the recommendations, please keep em coming.
Questions, Are highs consisered trumpet,flute, saprano saxaphone and cymbals?
When you want to test your tweeters air and extension, what type of music or intruments are you looking for.
Thanks!

Just listen to a range of music you like. You'll know pretty quickly if the ribbons are more extended and sweet than what you're used to.