Will I notice improvement with crossover mods?

Hello Mitchb..I am no expert but you should hear a difference. I strongly suggest using better caps than Solens on the tweeter/midrange section of the crossover.IMHO the Solens are fine on the bass section.If your going to do it right... put the best caps you can afford in the midrange/tweeter area. Maybe if you can swing it try some Mundorf Supremes.These caps are used in Audiodata, Audio Physiks, Avangarde Acoustic, Burmester, German Physiks, Hedler & Hoffmann, Magnat, Outsider, PHL, Sehring,Verity Audio, Symphonic Line, Trenner & Friedel. Also a lower grade version of the Supreme is used in the Sonus Fabers! So these caps are the real deal! Also if you can swing the Mundorf Silver PIOs,these are are the top of the line Mundorf caps..the Supremes are no slouches thou.Just to give you an idea the Sonus Fabers Cremonas floorstanders($8000.00) a pair use the Mundorfs 4 th best capacitor..the Supremes and Silvers are number 1 and 2 on the list!

Make sure your resistors are non inductive and spec within 1 % of each other. Here's a review of a few caps. The Crescendo and Sonic Caps are also very good! At the moment I am using a mixture of all these caps except the Mundorf Silvers.

http://home.hetnet.nl/~geenius/CAP.html

If you have $$,try Mundorf Supreme Silver Caps !

Good luck !

I should note that the design of the Hales crossovers will remain the same and the values will be as Hales intended. The only difference is that the parts will be better and will be matched to each other between the two speakers. The Hales design will remain the same.