FWIW not exactly apples to apples but I drive JMlabs (Focal) original Micro-Utopia's with a 17 watt PP class A triode wired stereo tube amp. No issues whatsoever it drives them effortlessly, not sure what the exact specs are but sensitivity is either 89 or 9db. I would imagine you'll be fine with the Sopras if you decide to go that route. No interest in AN speakers? Pretty sure a pair of either AN/K or AN/J's is in my future. I have an AN Sig-3 Dac as my source and love it. Whichever way you go good luck!