Thank you for that confirmation, I figured this was the case.
Amazing how 6 months changes things - before I was like "I am not going to keep trying to climb this mountain (HE-6), there must something else I can drive with what I have that will satisfy me!", and now I'm like "OK, the HE-6 are IT for me, I will do what I need to to drive them".
So, I will be using my Ref 10 as DAC/pre-amp in this scenario... question then follows, what amp??? That, of course, is THE question where the HE-6 are concerned, isn't it? ;)