Experimenting with a different tweeter - Just for fun I substituted the MCM 53-480, a 1" titanium dome driver that appears to be the shielded version of the tweeter used in the Bottlehead Straight 8. I used a highly modified version of the Straight 8 version 3 crossover with this tweeter. Here we are comparing a $14 MCM dome tweeter to an $88 Fountek ribbon. As I expected, the Fountek provides greater low level resolution, but it sounds a bit laid back compared to the MCM dome. Overall, the sound of the FredArrays with the MCM tweeter is very engaging.
A view of the Straight 8 ver 3 crossover with modified crossover frequency to compliment the Silver Flute woofers in this array. The crossover is 2nd order with a parallel LCR notch filter in the signal path and a series LCR filter across the tweeter terminals. I ultimately eliminated the notch filter and replaced it with an entirely different 3rd order crossover configuration.