Didn't make as much progress as I'd hoped yesterday. After removing the old grill cloth, I sanded off the old adhesive on the back sides of the grill frames. Probably not necessary, but I wanted the new adhesive to have a good, clean surface to bond to. The sanding also took off some of the black paint, so I had to repaint the grill frames. So, I'll let those dry for a couple days before I apply the new grill fabric.
I ordered my replacement crossover caps this morning. After quite a bit of research, here's what I ended up selecting:
Tweeter Series Cap - 3.0 Sonicap Gen 1
Midrange Series Cap - 6.0 ClarityCap PX
Woofer Shunt Cap - 2x - 8.2uF Mundorf ECap AC
My initial plan was to just go with Dayton Audio DMPC 5% caps in all positions. That would have only cost a little over $13 per speaker, but I thought this would be an opportunity to try some more highly regarded, but still affordable, caps - especially in the critical tweeter and midrange series caps. When selecting crossover caps, it's real easy to get tempted to move up the food chain. It's a slippery slope. There are so many options, it can get expensive quickly if you aren't careful The solution I ended up with only costs about $6.50 more per speaker (less than $20 in parts per speaker) than the Dayton 5% caps and is actually less expensive than going with Dayton 1% caps.
The Sonicap is highly regarded by both Polk and Klipsch aficionados (including Bob Crites). It's also highly recommended as a budget cap by Tony Gee on his
Humble Homemade Hifi Capacitor Test page. Tony Gee also had good things to say about ClarityCap PX series as a good budget crossover cap. Finally, I decided to spend less and go with a well regarded, but inexpensive, electrolytic in the woofer shunt circuit. I also considered the Axon True Cap film caps in this circuit. Combining 13.0uF and 3.6uF True Caps in this position would have cost less than a dollar more per speaker than the Mundorf ECaps. I'll see how I like the sound with the Mundorfs. If I like it, I'm good. If not, I'll add some Axon True Caps to my next Parts Connexion order and rework one speaker so I can do an A/B comparison between the Mundorfs and Axons. I suspect the Mundorfs will sound fine and this won't be necessary.
Tony Gee also specifically recommends using 0.01uF Vishay MPK1837 as bypass caps for the Sonicaps:
"Putting a 0,01uF Vishay MKP1837 parallel to them (a good tweak for nearly any capacitor) can create even more detail and separation!"
The 0.01uF Vishay MKP1837s are currently on sale for $0.80 at Parts Connection. So, I'll probably pick some of those up to try as bypass caps on the 3.0uF Sonicaps and perhaps the 6.0uF ClarityCaps.