Thiel CS2.2 Xover Recap

ESR measurement of a Visaton NPE 100 uF - 20 years old

I can't say for other types of NPE's, but this one is pretty good and won't make a night and day difference in comparison to more perfected poly caps.
 

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I have been experimenting with Thiels for 17 years and have a wealth of findings. First and foremost is the realization that the caps Jim used are complete garbage! Regardless of the film foil construction they are not wound tightly, squeeze one and see how spongy they are. Better yet pull a pair of the 1uf caps and put them in a preamp input as a coupling cap. Unlistenable upper ranges but also extremely dynamic to a point of harshness. This is where Thiel got the bad rap from those **** caps, he probably saved a ton by buying them in bulk but doomed his creations with his choice. Unfortunately caps take a long time to burn and testing numerous caps takes a very long time and lots of frustration. They also used the Vifa D26 which was an OK tweeter but had a compromised damping implementation. I have developed a replacement that is Beryllium with custom machined plates. HUGE improvement with better caps. Actually my CS5i's with the mods are unbelievable although they are modded to be bi amped with integrated ICEPOWER amps on the subs which cured the ultra low impedance issues.
New caps are vital to the Thiel speakers. If there is enough interest I am going to start to market the tweeters. I started a web page to document the path to glory with the Thiel speaker. Resurrection Audio