Thiel Owners

@pieper1973

The thought of putting Dueland caps into CS2.4 is wild to me. Even if Dueland makes the proper capacitance values (I don’t see anything close at Parts Connexion), the price would staggering. Multiples of the original price of the full speaker. But I would love to hear the outcome!

I suggest taking Tom Thiel’s advice, go with Clarity Cap CSA. Ideally, get full capacitance in single caps. 14 and 28 uF are tough to find but I would avoid going with 13+1 and 27+1 as in the original CS2.4. Running caps in parallel, I would go with something like 10+3.9+0.1 and 18+10. Try to get a more even balance among the two bigger paralleled caps. The 0.1 uF bypass is where you might go crazy and install a super-ultra bypass like a Dueland or Jupiter (even those are expensive!). You could add a 0.1 bypass to the 28 uF position as well.

Tom pointed out that the higher voltage models (eg, 630 V) have thicker film which is desirable, especially in the coax feeds. But I heard a difference even in the woofer shunts with 250 V version sounding more impactful than 100 V version of an otherwise identical cap. If your budget extends to Dueland$, definitely you can afford to replace the electrolytics in the coax shunts to film caps. Clarity Cap is a great choice for these, although be warned that their size is far greater than the electrolytics. That is, you might be challenge to fit everything within the passive radiator chamber.

Definitely upgrade the sandcast resistors to Mills MRAs or, if your pockets are Dueland-deep, maybe try Path or Dueland graphite resistors. Again, those ultra re$i$tors are hard to find in the proper values for the CS2.4.

About the CS2.4 serial numbers . . . I’ve been piecing together the history puzzle. What seems clear is that the transition to Asian inputs such as CS2.4 crossover manufacture was far from smooth or steady. Even though Rob says Lex 2.4 XO manufacture ceased around #220-230, that’s only part of the story. We have evidence from participants on this forum that later XOs were Lexington-built and that some later Asian XOs were decidedly inferior to some earlier ones. One key is that FST, the "best" supplier wasn’t the first supplier and that the road was pretty rocky to arriving at well-made units with top grade parts.

The Lexington XO department was not disabled until New Thiel moved to Nashville. While it was operational, runs of "old Thiel" crossovers could be and were made in Lexington with classic Thiel parts to fill in until acceptable units arrived from Asia.

With the records gone it seems the most reliable test is whether a board is built on masonite or not. If yes, then it is from Lexington with classic Thiel parts and QC - which means very tight performance assurance. If fiberglas, then more is unknown. Some Asian boards that I’ve seen are quite poor and some quite good.

Another potentially confusing element is the SE designation. The Signature Edition had a special cabinet with red Birdseye Maple veneer, SS bolts and outriggers, and larger, signed back plate. The only electronic upgrade was the ClarityCap SAs in the coax feed replacing the standard Solen caps. I think that run had its own serial numbers (1-300?) However many regular 2.4s have had the SE cap upgrade or better and some designated (red BE, etc.) SEs use Asian boards with SA caps. So, there are more variants of the 2.4 than might be assumed. I now have a pair on loan from a collaborator (#3729-30), in mature-Asian form with clean coils, polyester (MPT) caps and PP 1uF bypass caps, rather than classic polypropylene caps and tin-styrene bypasses. This is a de-spec iteration which I predict would sound inferior to a classic Thiel build. But it does sound delightful. Despite its somewhat shady history, what a wonderful product!

My CS2.4 serial number 384X, the last digit faded out unreadable, this is xover photo taken 5 years ago before modding.

@tomthiel

My Thiel CS 2.4s are serial# 2951 and 2952. Purchased pre-owned from Audio Consultants. Speakers were approximately 5 years old at time of puchase in April of 2011, with 5 years remaining on the warranty.  So presumably manufactured some time in 2006.  So with respect to the boards and parts, where does that leave me?

Additional factoid: On my Thiel Warranty Registration, date of sale to original owner is listed as July 6, 2006.