I, for myself, am thinking about getting the matrix M-stage for the 650's. It's supposed to be a budget amp, but really good.
And now there is a version with bult-in dac!
Does anyone have experience with this pairing?
I suspect it could be better than the e9+e7.
I havent been able to find much comments on this particular combination with the 650's.
but a few presume it would go well with almost any headphone.