Ferrofluid questions.

I am considering changing out the ferrofluid in the tweeters on my Thiel CS 3.6 speakers. It appears that I should be able to do the work myself. Someone gave a link in another thread to little tubes of the ferrofluid that you can buy for less than $10 from Parts Express.

I have been attributing unclear vocals to my Bryston 4Bsst2 amp being not clear enough. I may still upgrade the Bryston amp to the "cubed" version of the 4B but I’m starting to wonder is it more an issue of my older Thiel speakers’ tweeters having overly resinous ferrofluid.

Could too old of ferrofluid in a tweeter contribute to coarseness in the treble range? What about a slight lack of vocal elocution? I have resorted to using the Soundhound app on my iPhone when listening to vocal music in order to bring up the lyrics. Or, I read the lyrics on the CD cover if they are provided.

If the new ferrofluid improved vocal clarity I would be a very happy guy.

I hope I don’t damage the tweeters in the process.

Also, if you can change the ferrofluid on the tweeter, does the midrange cone work in the same manner?

I look forward to optimizing my speakers further. Thanks for any help you can give.