Good stuff.

I just have two concerns about ZO3, the first whether how it sounds with treble @ lowest level. The treble boosts won't be of much use for me if it's too bright to begin with. I'm no fan of V-shape signature, I want boosted bass but pretty much equal mid and highs presence.
So it still means I have to look for non-emphasized highs bass headphones for my needs as opposed to if ZO3 had the possibility to also decrease highs a little, then I could also look at headphones with emphasized highs and decrease the highs on ZO3 to get the balance I'm looking for.
The second would be the output impedance, it has been good (low) so far but that's not a garantuee that it wouldn't get higher on ZO3.
I can certainly see where you are coming from with this. It may be me being an ignoramus but I don't understand why midrange is not addressed as well as bass and treble. Maybe that is asking for the Zo to be all things. In effect an EQ which I guess is not its aim.
It's like the saying goes:
A new audiophile craves bass;
An established audiophile craves treble;
A really serious audiophile craves mid-range.
I am not sure I would want a thick sound.
I value good separation of all the frequencies.
That to me is transparency.
Let's hope Digizoid hear our fretting!
The devil is in the details.
When I first started getting into Hi Fi I just wanted a sound that was "right".
I cannot believe how complicated fulfilling that simple requirement has become!
I would say a sensible aim would be to hear what the Producer intended. The artist is not necessarily technically informed.
now so let's stop it here.![]()