Thiel Owners

upgrade the equalizer, which would be required for system synergy

I might not even be able to *spell* "equalizer" . . . Is there potential harm to the balance by simply upgrading the caps and resistors on the XOs, keeping the layout as is? Keeping the same layout might preclude replacing the electrolytics with film caps but I imagine 30 year old 'lytics should be replaced if only with another 'lytic. I guess I'm wondering if there is a "partial" upgrade route for 3.5 owners that would replace aging caps and increase SQ at least a bit but without risking the balance with the bass equalizer.

Guys i  e-mailed Rob Gillum about the CS 3.7 crossovers and he told me it is still possible to order from him the latest crossovers if you want to upgrade first generation of CS 3.7s.

Beetle, I haven't yet looked at the 3.5, but will look into it. The equalizer could indeed be ignored in an upgrade. The 3.5 has 6-nines coils and hookup wire and custom 1uF styrene bypasses. We could renew the 'lytics with best of class 'lytics, especially in shunts. But any 'lytics in Signal Path would benefit from our newly developing custom CSA-160 volt propylene cap. Mills resistors. Possible SP feed coil upgrade. Layout can be addressed by building a new midrange board to allow space on the main board for woofer and tweeter upgrade bulk. I'm settling to a system. I "did" the 3.6 today with our first-round assumptions which need confirmation with first-pair trials of 2.4 and PPs.

As can be seen in this thread, and another speaker thread I have going, I have a roving eye for speakers.  I just like trying various types.
But even if I purchase another speaker I can't see myself ever getting rid of my 2.7s.  Too good, and the bargain I paid was ridiculous for the performance. 

I love electronic music and the 2.7s are a dream for that category.  Their particularly dense, punchy, solid imaging and gorgeous tonality make electronic music feel like another dimension has been summoned in and around the speakers.  I never get tired of it.

 I haven't yet looked at the 3.5, but will look into it. The equalizer could indeed be ignored in an upgrade. 

Sounds good, Tom. Seems to be some demand for that model! And maybe someone will step up to address the equalizer?