Will I notice improvement with crossover mods?

Gregm, I was going to suggest the same thing. Although, the Hiquphons are smaller than most, and will not drop right in.

I would suggest the Vifa Ring Radiator. At $65 it is a steal, our speaker designer at Fried likes it better than the much more expensive ScanSpeak Revelator at the same company. I have the Revelator now in my Coincidents, but will say upon hearing the RingRadiator, it sounds very special.

The tweeters I've ordered are the Seas H881 which I hear from a good source are supposed to match well with my speakers. Of course they are only a $28 tweeter but they are supposed to be OK for the Hales. I heard from a designer who had the same Hales T5's as me that he used the H881's with great success but went to the millenium series. He said the H881 tweeters were actually close to what he ended up using. I suppose I could spend hundreds on tweeters but I thought I'd try comparible (price wise) tweeters to the ones that came with the Hales. I'm going
to crimp the tweeter leads so that if I want to return the tweeters and go for something else I can. I'm leaving my options open. I hope the Seas H881's will do the trick as I don't want to start spending tons of money on tweeters.If anyone has advice regarding my current excersise please let me know.
Thanks again,
Mitch

The H881 did not fit in my Hales so I decided to order the Seas Millenium as they are the correct size(110.4mm) to fit my Hales and they are supposed to be quite good. They are costly however. As I crimped the leads to my tweeters I can always try the Millenium and if they don't work for me I can always return them.I was told by someone who did what I'm about to do with my tweeters but he said he removed the .33 ohm resistance in the tweeter area. I hope it will not be neccessary for me to do the same as it would be a real job to open up my Hales to get back at the crossovers.

Will Martin-Logan Ascent i benefit as well?

1000 hours play on my Hales with the crossover mods with about 300 hours on the Millenium tweeters I installed and the speakers are sounding very very good. I'm blown away actually. I never thought the results would be as positive as they are. The speakers have an entirely new sound which I love. There is more bottom end without boominess, the midrange is sounding sweet and the new tweeter gives the speaker a whole different type of sound which is extremely pleasing. The tweeters are very detailed but lack the slight harshness of the Hales stock tweeters. The Millenium tweeters are much better sounding and they change the entire sound of the whole speaker. I never realised just how much the tweeters affect the bass response but it does. The bass is now different but in a pleasing way. All in all I must say I do not regret the crossover mods or tweeter upgrade in any way. I have a much much better speaker in return and it seems as if they are getting better daily!! I'm having fun. My wife misses me however but she knows where to find me.