Will I notice improvement with crossover mods?

Keep in mind that there's a plethora of good tweets out there that COULD be near drop-in replacements. All you need is the impedance curve & efficiency of your present tweets (choose the one that sounds "better", obviously there are discrepancies there) OR, simply, the efficiency of the mid-driver. You also need the x-over frequency, but you've got that anyway. Scanspeak, Vifa (T series), the bigger Seas, Hiquphon, Morel 33...

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?