I rebuilt the crossovers in my Q2's and replaced everything except the two big electrolytic caps and the inductors. I also wound up keeping the old pots and just cleaning them as the new pots I found were a little big as a drop in without some mods. They old pots now work and spec fine. Upon testing, although the drivers are out of the cabs, connected but just sitting on top the cabs, I can tell the rebuild is going provide a huge improvement in sound. I also checked everything using many specific frequency tones generated from audacity with a small amp connected to a laptop and everything checks out. Tested the crossover points with a multimeter that can read Hz. I did find out some interesting things when doing this. Anyhow, I'd like to dump the old big electrolytic cans as well. Since identical replacements don't exist, I was thinking of using Bennic electrolytic caps. A stack using a 1000 and 100 for the 1100uf cap and a 500 and 200 for the 700uf cap. These are cheap, although they are new, and the new caps which replaced the old for the other drivers did make a big difference, even if the old caps did read close to spec. Any thoughts on this appreciated.