Btw I wonder how your Thiels have a “coax “board. Are you referring to the PCB that houses the crossover for the mid highs vs the woofer?
I have repaired botched crossover jobs by people who just swapped in boutique caps into crossovers and blindly followed the 1/100 bypass rule. The Zobel and the LCR filters do NOT need boutique caps. The bypass rule normally applies to high voltage regulation and not speaker crossovers. Also size and vibration and cold solder joints are key concerns for diy speaker mods. Be careful and think twice.
I have repaired botched crossover jobs by people who just swapped in boutique caps into crossovers and blindly followed the 1/100 bypass rule. The Zobel and the LCR filters do NOT need boutique caps. The bypass rule normally applies to high voltage regulation and not speaker crossovers. Also size and vibration and cold solder joints are key concerns for diy speaker mods. Be careful and think twice.