I ordered this one.
https://www.amazon.co.uk/gp/product/B08CX78M1T/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1
Cheap. But believe it will be an upgrade. Not sure if going balanced and OCC will make any audible difference from then on.
But, I'm not as skeptic as before.
Boughtthe silvercoated cable for length not to improve SQ. But I was rather shocked when i heard it.. Had no preference in to cheating myself in any way in this regard.
Also I can confirm that this HP thrives with more power, as others also has suggested (to some debate i believe).
The zen stack sounds great, but going from dac to amp and then again from low to high gain on the can, and at last switching to variable, to improve input voltage from the dac to the amp.
Every one of of these steps gives incremental improvements -noticeably in form of control, overall dynamics and punch. Just more body and weight. This should make sense in a scientific sense also. Though im not the one to explain it
I will invest in a more powerfull amp in near future. Any good suggestions. Must not be clinical/sterile in sound. Like the can for it´s warmth. To bad it´s on the limits with this HP.
But seriously for those who say it just need to be loud enough. Try running them from a phone, then from a powerfull amp. If you can't hear a difference you really shouldn't own a HP at this price. Why would an upgrade in power from a small to a bigger amp with better power delivery not also be an improvement