As far as I'm concerned, the impedance of the MK VI+ is too high for Focal headphones as well. I only tried pairing the Utopia with my MK VI+ once and that was enough. The Utopia's bass lost it's precision to some degree and I could still hear sound with volume turned to 0. I assume the results would be about the same with Clear.
Yes, the jumpers were set on low position.
https://www.soundphilereview.com/reviews/little-dot-mkiii-se-review-1045/
This is the one I would be interested in, but have no room for right now.
Still don't have an output impedance number for it.