Dgarretson, exactly my point, if you read back thru this now WAY DEAD thread facts are that even with the original posters testing and other amature builders thoughts bottom line is all this stuff especially with the testing of the cast was done in circuits following or leading another cap of different type #1, secondly they are all done in Mono testing...
I have discounted 99% of this thread as just bantering about how one small difference could be heard in 30 seconds after re-configuring a single design 15 times.. All of above are premium caps, all will do a good job, better or worse is impossible to pinpoint with everyones application, but the cast is not a miracle pepper cap on eggs. Run full out real tested finished crossovers with consistent cap use, and no doubt 100% clarity cap or Duelund VSF will then show you what is necessary, but this also has to be done with resistors and inductors of quality not from 1979 integrating the other drivers in the system..
No matter what you will find other issues. Inexperience or experience will show this, but no doubt there are some good shortcuts along the way and a 600 dollar capacitor or a 6000 dollar amplifier can make some kinda difference, but is it perfect? Nothing is in the end, but getting close is the key.