Commenting to let people know it is absolutely possible to change the wire. I used the Linsoul Euphrosyne. Much nicer. This is actually the A3000 as I much preferred the sound to the A4000. But they both use the 2 pin system, so thought it would be useful.
A lot of 2 pin wires already have a groove on the correct side. It just only requires scoring with an xacto a couple of times. After that it fits perfectly and snug.
Mkizzletried with all the cables I could (tripowin + various stock cables) even after cutting out the notch the opening was too small for any of my cables to fit