Mr. Charmerci,
How are you doing man?
Couldn't resist on commenting.......
You know I have heard them

The philharmonitor 2s are the ones I am familiar with not the 1s. I have heard the Songtowers (Dennis' design as well) with AVA equipment and I was blown away and it was then I begin to follow Dennis/Jim (Salk). As you mentioned I think Dennis using Frank's amps too. So that says something, buddy.
The songtowers have the seas/hiquphon and another form of ribbon tweet, but not the fountek.
Unfortunately I do not own any of the AVA equipment, (wish I did), but I have friends who have it and haven't considered changing......

Can't imagine the monitors would not sing to their hearts content.
Robert