I'm looking for suggestions for how to add an external high pass filter capacitor to a full range single driver speaker which have tube connectors installed.
I'm calculating the capacitor at 16 microfarads for a 100 hz cutoff. I believe this will relieve the driver of unnecessary low frequencies as I have a subwoofer handling the below 100 hz frequencies.
If you have separate amp and preamps, it will be much easier to put a cap between them than after the amplifier, and much easier to calculate.
The values will be much, much smaller, allowing you to use much higher quality caps and still not break the bank, without having to resort to cheap electrolytic caps.