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I am not permitted to post there.
There are only 2 at Penon which appear not to be a modification.
OURART Ti7 at 80$ with the balanced cable. Uses MMCX connectors on the bud....
My query is answered.
They exist, ranging in price 10$ to 165$ .
There are improvements it is guaranteed to make. It would spare me the expense, storage burden, and hassle of multiple sets of cables.
The frequency response of what sounds flat for a CIEM is not going to be the same as for a speaker though.
For headphones, it looks similar to...
Do earbuds for balanced audio exist?
Something with detachable cables or an attached cable with 4 contact TRRS connector?