I don't own YG speakers but if they like power 70watts may still not be enough, That said I like my Prima Luna Prologue 5 a power amp a great deal. using GL KT 77s which make fewer watts than the stock KT88s One of the good thing in the Prima Luna line is the flexibility of the power tubes.
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You're amp is going to need some power to drive these speakers. I only found impedance results for the Carmel 2's which indicates much of the mid bass in the frequency spectrum is around 4 ohms.
These speakers seem better suited for a SS amp, but check out the review using a PrimaLuna...
Can not say anything about YG speakers, I've never auditioned them. I've got Dynaudio Audience 72 quiet inefficient speakers (86 dB)
Currently I have PrimaLuna Dialogue Seven mono blocks and run them not even in ultralinear (70 watt) but in triode mode (40 watts).
I'm very rarely put more then 50% of power output, like ~ 75% because it's waaay too loud.
BTW this PrimaLunas amps to my ears best sounding amps (for any price) I've ever auditioned in my 30+ years of audio hobby...