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Um, er…
I have used the Mojo with HD-800's for years.
Yes you have to burn the amp in, along with the dac and 800's.
And it may take hundreds of hours to fully settle in.
Case in point, my Rok with 690 hrs. is just now going magical.
My unasked advice is to track your burn in over time, by finding where the "icepick to the skull" starts to kick in (10:00, 11:00, etc.) on the vol. control. This position, (of the vol. control) will change as it breaks in.
I'd also suggest that when it hurts, turn it down, and not to 'push thru' it.
Pain is a warning that damage is or can be happening.
Wait until the, what I call the Listener Fatigue Factor (LFF), has 'lowered' to the point that you can 'easily' (without the "icepick to the skull") reach your desired volume.
And know that you may need to apply some additional tweaks in order to fully deal with the "icepick to the skull" syndrome, especially if you want to crank it up all the time…
You're playing in the big leagues now,
and there are certain 'procedures' that are 'advisable', that is if you want to realize all the potential that this gear is capable of delivering…
And the first step is burn in.
JJ
Thank you very much for the sage advice. I do appreciate it. It's funny, I've listened to the G/M stack almost exclusively since my original posting, and with some music that's not in my usual repertoire -- the entire Buena Vista Social Club album. I thoroughly enjoyed every moment of it! At one point, I compared it to the UberBifrost/Asgard2 stack, and the G/M was so much better as to render the UberBifrost/Asgard2 almost unlistenably muddy (don't get me wrong -- I love the UberBifrost/Asgard2 combination and think it's excellent, but in comparison with that particular music, the G/M really shined).
I think my usual repertoire can be pretty bright with the G/M, but in terms of overall playing time, I probably only have about 30 hours in on it...so assuming burn-in is a real thing with this stack, I think there's plenty of room for further improvement. We'll see! I'm a Schiithead, so I'm sure I'll learn to appreciate the unique sound signature at the same time as any physical changes take place.