Thiel Owners
There's some info about specific (to the review pair) serial numbers in this 1999 Stereophile review around the same time frame - https://www.stereophile.com/floorloudspeakers/220/index.html
Later on, Thiel changed the tweeters to vented ones (although I'm not sure of the exact date (probably around 2004). My friend worked at a high end shop and I generally did all his set-ups with him, including changing 2.3 tweeters (I owned 2.3s many moons ago).
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igmaty - the CS2.3 was introduced december 1997 and had a minor XO tweak November 1998. Thiel’s serial numbers always began with #1 and 1/2 were the first pair, etc. My notes say about 2750 pairs were made, so numbers would top out about 5500. The coax was updated some time in the product life which necessitated adding an 8.5 ohm resistor and 3uF cap. That change came February 2001. Try Rob Gillum about the particulars of how to identify if you have early or late 2.3s. Once you get oriented, there is substantial / qualitative sonic improvement to be had via relatively simple crossover component substitutions. First get them up to speed and have fun listening.
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