Harry, I have looked long and hard at which models to hot-rod. My choices center on Thiel-developed drivers and a long life horizon going forward. Although the 3.5 was a defining product in its time, it doesn't check enough boxes. The drivers are modifications of commercial units with little of Thiel's proprietary magnetics or cone materials and geometry. Those drivers are becoming obsolete. Same can be said for the equalizer. Redevelopment of a product is a substantial undertaking requiring custom component development and re-voicing via systematic measurement and listening, like when a new product is developed. I expect the results to be worthwhile.
The first-tier models are the PowerPoint1.2, CS1.6, CS2 2, 2.4 and 3.6. Next round includes the 2.7, 3.7, CS6 and 7.2 - in order of expressed interest and personal time availability. First tier hopes to debut before year's end.
I agree with your "masking" comment, which can be attributed to various factors. Among them is the presence of electrolytic capacitors in the signal path which are at or nearing their end of life expectancy. Since you love the speakers and if you or someone you know is capable, I believe you can make a great improvement yourself by removing the crossovers and replacing the electrolytic caps and resistors with like-values. (Your coils, wire and layout are excellent.) If that prospect interests you, I can point you to brands and sources which have emerged from our upgrade project research. You are welcome to send a PM to explore this avenue.
The first-tier models are the PowerPoint1.2, CS1.6, CS2 2, 2.4 and 3.6. Next round includes the 2.7, 3.7, CS6 and 7.2 - in order of expressed interest and personal time availability. First tier hopes to debut before year's end.
I agree with your "masking" comment, which can be attributed to various factors. Among them is the presence of electrolytic capacitors in the signal path which are at or nearing their end of life expectancy. Since you love the speakers and if you or someone you know is capable, I believe you can make a great improvement yourself by removing the crossovers and replacing the electrolytic caps and resistors with like-values. (Your coils, wire and layout are excellent.) If that prospect interests you, I can point you to brands and sources which have emerged from our upgrade project research. You are welcome to send a PM to explore this avenue.