Hart Audio Cables and Periapt Cables make custom cables that are not only very high quality(they do come with a cost mind you) but they are quite nice.
balanced is always the general preferred option if one has the budget. You will need 2 balanced cables… male to female xlr for geshelli dont over think them as those don’t have to be expensive
lol sounds like me, that’s fine then. Every headphone has it’s own respective signature and qualities… I like the 1990 as it’s quite flexible… I use it with Suede pads which ups that bass alot and drags the treble back… granted 880 definitely wins on vocals and can become bassier than the 1990… in terms of brightness, soundstage, and imaging 1990 wins in that regard.
for starters, it takes significant modifications to even do this mod so most people avoid it(it’s not as easy as say the dt 880… because the 1990 uses a 3 pin mini xlr instead of an attached cable), it’s only 250 ohms and doesn’t scale as much as the 880 or T1.2 when it comes to amps and dacs let alone doesn’t remotely need that much power.
Alot of amps will have better sounding hardware in them alongside more power and headroom in their balanced ports if they have them but with the addition of the balanced port the single ended port loses a lot of power and generally has the lesser quality stuff for it.
Theres a long drawn out explaination of balanced vs single ended so that one I will leave for you to read up on… 1990 being balanced is a rather opinionated topic but to me… it’s an absolute waste of time and effort for little if any pay off other than you get to use your pretty balanced port…
I just want to add how obnoxious this is, as you would have hit a big snag there if you went and bought there suggestion… the erish only has xlr plugs… the 400i does not come with an xlr cable it comes with 3.5mm unbalanced. you would have needed a cable… like… https://www.amazon.com/NewFantasia-Balanced-Compatible-Headphone-Replacement/dp/B07HGP87F6?th=1