Does a standard 3.5 cable can become a 4.4mm balanced with adaptor or it will only work with balanced cable at the beginning
I believe your question is whether an IEM cable with a TRS plug can be connected via an adapter cable to the 4.4mm balanced output from the WM1A/Z ?
Depending on what your are trying to achieve:
1. Will this make it balanced output from the DAP to the earphone? I believe the answer is no, as balanced output needs 4 wires for L+ / L- and R+ / R- . Your TRS plug to the IEM only has 3 wires, L+, R+, and combined L-/R-
So there does not seem to be any point in doing this, as you are not getting the benefits of a balanced out.
2. Would you get a signal to the earphones? Probably, but take that as a guess, as I have no practical experience doing this.
Also, you would need to get the adapter configured for: Male 4.4mm TRRS to female 3.5mm TRS, which means you could not use this adapter for a 3.5mm TRRS for balanced, but would need to get another adapter made for the 3.5mm TRRS
The extra work and cost make this super unattractive. The only logical use of an adapter is to convert an IEM cable that is already 3.5mm TRRS to 4.4mm TRRS, thus being able to use the 4.4mm balanced output without rewiring the IEM cable to a 4.4mm plug.
2. Would using the 4.4mm from 3.5mm TRS see extra power delivered from the 4.4mm output? Would the balanced output drive the higher power into the TRS connection, even with the ground signals combined? Don't know what would happen, and I suspect this is an area that is not worth investigating. Somebody else with knowledge experience would need to pipe in, if this is an area of interest to people.
Added some nice schematics from:
https://www.headphone.com/pages/balanced-headphones-guide
(see the site for much more details)
TRS
TRRS Balanced