Time for a quick update on my crossover upgrades. For the record, I have changed out every part in the crossover. What I have now are:
Clarity Cap MR's for the tweeter and midrange caps.
Clarity Cap ESA and MR for the other cap
Mundorf M-Resist bifilar resistor
Jantzen Copper/Foil/Wax 14ga Inductors in all positions
VH Audio Unicrystal OCC copper wire
Overall the sound has taken a large step up and I am super happy. A few notes about each change, now that I've had a bit more time to listen to everything.
Caps - changing caps had a different effect that I thought. Moving from the Sonicaps to the MR's was an improvement in clarity, transparency, micro dynamics and sound staging, but a step down in terms of tonal warmth. Basically the MR's sound more clear, while he Sonicaps sound more pleasant.
Resistor - I was surprised that changing the resistor had any effect at all, but it did. Slightly better clarity. That's about it.
Wire - OMG, the VH Audio OCC wire is a freaking amazing discovery! It's the best wire I've heard, regardless of price. And it's CHEAP (relatively speaking). Can't believe how incredibly good it is.
Inductors - moving to the 14ga Jantzen copper/foil/wax inductors was easily the biggest single improvement. Pretty much every category of sound improves. Warmth, heft, clarity, dynamics (macro and micro), separation of voices and instruments, percussive attack, well you get the picture. Highly recommended.
Side note - I have a dedicated amp driving the top end of my Super 7's, a First Watt Burning Amp 3, which I started with Sonicaps on the input board (only caps in the signal path), and then moved to Clarity MR caps, and have recently put in Jupiter Copper/Wax/Paper caps in there. After burn in, holy crap! These caps by themselves were a bigger improvement than all the other upgrades. They are awesome, and I was lucky that I only needed a .22uf value for my amp. I'm thinking of maybe getting some for use in my Super 7 crossover, but holy shit are they expensive in 10uf and 15uf values. Hmmm, maybe I'll try bypassing my MR caps with some small value Jupiters instead....sheesh, this hobby is expensive!