A previous discussion included a statement about crossover components.

In the 90's, MIT capacitors were "the bomb". I haven't been keeping up and I wonder if these are still made? Anybody?

Whether speaker makers scale their crossover components with the rest of the system varies a great deal.

Magico and B&W are two brands that do, using higher end Mundorf in the higher end speakers.  Focal is a brand I've only seen use OEM versions of low-mid grade Solen caps at best.

Personally I don't like high end Mundorf caps as I think they are a bit oversaturated, too colorful and splashy.  I do prefer Clarity caps overall though I've found that the high end Clarity caps still benefit from bypassing with copper foil caps at the larger (> 4uF) sizes. 

I have heard really good things about upgrading Wharferdale Diamonds even with low end Mundorf MKPs (I like the MKP's the most in the Mundorf line).

I suggest anyone who really wants to get into this to build speaker kits instead of starting off with an expensive pair of speakers. It's also much more rewarding.

@knotscott

Spatial M4 Holograms. Just got my Precision Fidelity M7-A back together and am looking forward to a test drive. The Spatials are sensitive 93 db at 4 ohms so they should be a good match. Spatial offered a crossover upgrade when I bought them, but I had to pass on that.Now I might consider replacing some of the components. Since the M4 is no longer in production, I assume the crossover upgrade is no longer available also. It might be fun!

It couldn’t hurt to ask them if the upgrade is still available, or at least what they’d recommend. Otherwise, go your own way...it should still be an upgrade from cheap electrolytics, sand cast resistors, and iron core inductors. Should definitely be fun to do if you’ve got that gene! Good luck!

Don't recommend adding polyfil to open baffle speakers! 😁

😄