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Looking for input: Best material for mid range cone

I had a surprise last night when I switched speakers in my system.  I've got a few pairs, but had been listening mainly to some Ascend Sierra 1, which have a polypropylene cone with a soft dome tweeter in a bookshelf design.  Anyway, I've got a pair of Tannoy Precision 6.1's, and swapped them in.  

The sound was noticeably different.  Piano sounded better, vocals had a finer quality as well, and the whole sound seemed a little more lively.  Now the Tannoys have silver interior wiring, a titanium tweeter in a coax design and are only rated for 75 watts. The cone material is some kind of pressed paper fibre.  And they are voiced to somewhat push the midrange.  But the sound was compelling.

I'm just wondering about cone material because some old Paradigms with Polypropylene were really not up to snuff, but they were quite old.  Any thoughts?
213runnin
helomech
1,694 posts
 
@kosst_amojan,

If plastic is a miserable material for cones, why do British monitors such as Harbeth Spendor and Epos produce such an elegant midrange? Have you compared such speakers to Focal's Flax cones?  
czarivey
5,946 posts
 
I love KEVLAR. It gives BEST and most realistic and natural midrange
seanheis1
626 posts
 
The harder materials tend to measure better but paper is very musical. 
bdp24's avatar
bdp24
9,820 posts
 
All cones suck. Planars are the only way to go ;-).
okeeteekid's avatar
okeeteekid
142 posts
 
I agree with bdp24, planars are the only way to go.
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