Hales signature 2's.

Haven't heard of or seen these things in years. As I remember, they imaged very well, good tonality, light on bass. Vintage was late 80s or eary 90s as I recall. Is that the same speaker? Don't know about mods.

Glreno, that's the same speaker. Tremendous imaging and real palpability. Very dynamic, however, unfortunately very poor ability in the bass.
Most of the reviews at the time, recommended a sub. My room is soooo small a sub would be detrimental. But I would really like to change out the tweeter. It is an MB Quart titanium unit that is easily surpassed today by the silk domes and the incredible accutron ceramic drivers.

I wouldn't mess with what the designer did unless someone very knowledgeable is involved....a professional like head of another big audio company.
These speakers are great the way they are. I've spent many hours listening to them (at a friend's). His system used a Muse 18 to reinforse the bottom, which had a custom board to integrate the two, designed buy Muse.
Again, I would avoid thinking you or a friend can improve on what a very successful designer presents to you.

Did the Muse sub help? How do you think this combo holds up today?

YES! As any excellent design, it holds up great but it may overpower you room.