Beetle and Duramax - I'd love to see pix or descriptions. I can supply the general MO for that time. The 2.4 was introduced in 2003, before Jim got sick. All hi-fi products were still being made in Lexington with components selected, developed and upgraded through the years. So, #005/006 would have Solen caps, ERSE 5-9s coils and resistors, teflon jacketed wire and masonite boards. In other words, what we consider "real Thiels". My notes say the 2.4 XO production went to FST around #220-230.
Also, the first (100 or so) units were treated as shake-downs with every unit going through an R&D type course of measurements and listening cross-checks in order to set the production measurement limits. Every Thiel speaker was tested in an anechoic tower with strict pass/fail limits which were developed via this test/listen process at the beginning of each product's life cycle. So, duramax's
CS2.4s would be the equivalent of "blueprinted" in the racing world.
Duramax - if you ever upgrade / hotrod those 2.4s, I would love to get the original crossovers as my laboratory reference for the model. I have a pair of late / FST (3729/30) 2.4s here on loan. Wouldn't it be interesting to compare early vs late?