DK Designs VS-1 Mk II Drive Carver Mk IV's?

The ribbon moves such little air,(that is it does not punch the air in the manner, or distance of a dynamic driver) that its sense of 'dynamic volume' is very limited, hence the seemingly low output.
Having said that though, my Sound Labs, (mylar thin membrane) fill my huge room with wonderful sound.
So, now we're back to subjective volumes, what is loud?

Mine room is 18x30 with 12' flat ceiling (listening position is about 24' from front wall. Carvers are about 6' from front wall and 4' from side walls. Don't play jazz and classical too loud. Yes, the 60" ribbon with (4) 12" woofers per side.

We are now in to a subjective realm which can be dangerous.
First, my room is 23x20 and is 18' high--and open to the kitchen through two casement doors, and open on the other side to a loft, overlooking the room.
This amp will play very loudly, but I am almost certain that you can clip it. In fact, it can almost become a challenge, if your tastes run to loud, and rock, or bombastic music.
It is a real 150 watt into 8 ohms, doubling into 4, so 300 watts is considerable power, but not as powerful as the 450 watt VTL, which you can clip already.
I like it because it is as neutral as the tubes you chose for the pre stage, and is very clear without being the least bit harsh.
Aren't the Carvers the ribbon design, if memory serves?

how loud do you like your music? Your room size is? Those speakers loud can even make a VTL 450 cry uncle occasionally.

I drove the, some would consider them hard to drive, Sound Lab A-1's with NO problem.
This may truely be the most underrated product in the audio kingdom.
Somehow, though, Daniel can't catch a break. Every time he offers something fair and reasonable, people, perhaps with agendas, I don't know, jump him like sharks in a frenzy.
I own the product, and find it to be better IMHO than the Gryphon, though similar, and certainly better than the separates which I have owned throughout my years in the audio sickness.
It is smooth, musical, strong of heart, bass wise--clear without brittleness, and overall, pleasing to the ear.
It has a unique manner of tearing the music apart three diminsionally which I find startling, when compared to similarly, and even much more expensive products.
I have owned everything from Belles to Halcro, (and was a dealer for a while), and find it to be the equal of many, much more expensive pieces of audio.
Sometimes products cost less than they should, and in the audio business, many people make judgments based on price rather than performance.(My experience at least, after 25 years in the industry).
This is a "Field of Dreams" kind of product. "If you build it they will come", I know I almost did.

I am driving a pair of Maggies MG12. VS-1 MkII perform effortlessly.