Hales Transcendence 5 speakers endgame?

If you have not upgraded the internal wiring of the speakers, I strongly suggest you do, for it will yield yet another worthwhile improvement.

no it won't. The speaker would measure exactly the same no matter what wire you use. 

The internal cables were  upgraded to Cardas Litz when I redid the crossovers and replaced the tweeters with Seas Millennium tweeters. As I listen to them now I prefer them to my Focal Utopia and Audeze LCD4 headphones with Moon 430ha headphone amp. The speakers are nice.

I owned Hales Sig 2's for about twenty years. In some ways they were a speaker that had few peers, yet they were also in many ways frustrating to own. I was never fond of the weight ( both in the bass and in their actual heft) and the lack of true bass. OTOH, once I sold them, I quickly realized the bass ( or lack thereof) wasn't the real issue, but how truly dreadful the MB Quart tweeter was. That tweeter was tremendously limited in its extension...and because of that, I believe the speakers were non-resolving in the highs. I only realized that after I heard a far more resolving and accurate tweeter...

With my particular setup, I have no problems with the highs that the MB's produce.

I think the T8s are end-game level speakers.  I found a guy selling a great pair a few years ago and would have tried them out, but their size just didn't fit where I'd have to put them in my room.

BTW,  some Hales fans may be aware that just before Hales folded (and later went in to pro sound), Paul Hales produced a flagship Alexandra speaker, shown only once I believe at CES 99.  You can see a photo of it in this report:

http://www.enjoythemusic.com/wces99/speakers.htm

I've always wanted to hear that speaker to see how far Paul pushed his design at the time.  Some reports said "best I've ever heard."I actually know by acquaintance the fella who managed to scoop up that one existing model!   (Never heard them, though).