Oh I see, what did you use your magni with?I couldn't tell you what the "best" would be because I only have a couple of amps, both solid state. But I can say that I get a very full sound with depth through my Asgard 3, much more than the magni. I've also run the 6xx on my LG V50 and it actually sounds good, surprisingly. They don't seem that hard to drive but I haven't heard them on an OTL amp.
Yeah I must say LG V/G series with their DACs do some serious lifting for being a phone. I am quite happy with my LG V20 but I would like some more oumph.
Just a thought, could I use my V20 to passthrough as a DAC and spend more money on a good amp and buy a dedicated DAC further down the line?
I cannot see myself changing out my HD6xx for any other headphone for many, many years because the sound perfectly matches my ears (I had to sell my Fidelio X2 because of the harsh treble). So I am essentially looking for "endgame" stuff for these cans, without going overboard that is.