ScOgLiO
100+ Head-Fier
I like my HD600 better with my Valahalla 2 and WE396A's (tubes), but I like my HD650 with my Jotunheim (SS), balanced. Both of these systems are equally as dynamic and punchy. The tubes do have a bit wider soundstage. It really does depend on the tubes used.
This is exactly what I experienced with 600 and 650. I also found 600 work better with OTL tubes and 650 work better with SSs.
So, was I right in assuming that tubes (depending on which kind of tube, sure, but let me simplify a bit) might give a warmer sound to the 600?
Since you both prefer a SS amp with the HD650 (which is warmer than the 600 from the start), I guess that might balance the two headphones -> a warmer 600 and a more balanced 650
I thought I was done for a while, but I guess you never really stop tweaking with audio stuff, do you? Haha