I have the Sennheiser HD600, Neumann NDH-30, Audeze LCD-X.
I use these with my SSL2 hp out, and with Qudelix 5K.
I spoke to someone about my impressions and his first question was: which dac/amp? and when I told, he just winked.
So my question is: is the difference this obvious with a more expensive dac/amp combo? Should I spend another 6-800 euro to get one? Do your headphones open up/perform that much better?
Long story short: NO.
It doesn’t make any difference at all, and those that think it does have fallen for placebo and snake-oil. The human brain is really easy to deceive with hearing, so to this day, and well into the future, people will continue to claim they hear things they really don’t.