Quick question: Is the mini-XLR pin out on the HEDDphones the standard configuration? I have some custom cables for my ZMFs/Audezes I'd like to use, if so.
Short answer:
They are almost the same and work.
Only difference:
The HEDD‘s are wired in inverted phase (reversed wires) for both cups.
This means both cups still are in same phase, therefore this is inaudible most of the time.
A lot of headphones run like this e.g. the whole STAX line.
On my RME ADI-2 Pro there is a switching option for Phase Invert both channels, I did try it extensively:
Depending on the music track a difference is audible, e.g. on double bass and bass drum.
Not necessarily normal phase sounds better all the time, sometime inverted was preferable.
In my experience for about 50% of recordings absolute phase is inaudible, for 35% normal phase and for 15% inverted has the edge.
This is in coincidence with my experience in the recording studio, where we try to take care of this, and e.g. the bassdrum usually is: first pulse = positive, and other instruments are aligned to this.
The difference is not night and day, you need to know what to listen to, to recognize it.
I wanted to avoid any misunderstandings, so long answer to a simple question, sorry.