Which Tweeter preferred- dome natural material, Beryllium/Metal or Planar Ribbon? Why?

Dome natural material ONLY, has to be 91db +, lower than 91db sens, Not interested, Dome only, natural material. NOT Be, Not metal. 

I run a  pair of tweeters with my dual FR, Wonderfullll, Never would go back to a single tweeter. 

About to experiment with a  trio of tweeters, But I think 1 will  be edge out by the 2 superior tweeters.

I note someone mentioned Seas tweeters, Seas are too low senstivitity,

Even their Crescendo rated 92db, I found in actual tests to be like 84db, IF THAT. 

A single tweeter in classical music just is too thin. Dual tweeters are a  winner

But, for instance, this Mundorf AMT tweeter (8 Ohms, 1,8Kg, and...$1145/piece!!) will need much less current, has a sensitivity of 100 dB ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I'm sure its a fine tweeter, BUt really my 92db sens tweeters, will perform as good as this AMT. again you do not need to spend a lot of cash to get super high fidelity. I run both tweeters witha single Mundorf EVO SG 8uf cap , which allows both tweeters to go down to 5khz. PERFECT match for my dual Full Range, Seamless intergration, just incredible. again repeating what I said above, now that I have dual tweeters in my system, I could never ever go back to a single tweeter design. Philips AD163 cerca 1978 at about 91 db. and a DavidLouis clone($100 pair) of a Seas T35($300+ EACH!!), at 92 db. Looking at a 6 ohm tweeter, again davidLouis clone of a veryyyyy expensive tweeter.

100db sens in a  tweeter is wayyyyy too high for my preferences. 

91-93 is my ideal. 94 ok perhaps. But not 95db. 

I can not work in dual tweeters with a  sens higher than 94db,,so actually , back to my 93 db as limit sens. 

Below 91 db is too low.

91,92,93

dont like the myriad of soft tweeters speakers (of differing materials) I’ve heard as they dont get brass instruments and cymbals right with the proper metallic clang ~~~~~~~~~~~~~~~~~~~~~~~~~ Problem w all dome tweeters is the fact , they are all being xover too low, Yeah I know Seas/Scan and SB Acoustics claim 2500hz-3khz is perfectly ok. But IMHO you are asking the T to do something that may add breakup/distortion. Especially w my classical/operas. I placea single 8uf cap which takes the T to 5k. Thats it. Now the T is very happy and sings beautifully. No stress, no breakups. Troels attempts to achieve this magical xover fq to 2k hz to meet his midwoofers. I can't stand fq's w T's below 5k hz. After lengthy experimentations and cash investments, I FINALLY figured out why my classical music was not LIVE sounding Now I have a front row seat in all my 1950's operas, , Corelli/Turnadot never sounded so powerfully dynamic and full of soul.