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Thank youI have the EX1K, with the original cable re-terminated to 4.4mm balanced. The original plug had a broken/intermittent connection when I bought it 2nd hand, so I bought it with the intention of replacing the plug with a 4.4mm, which I did.
My personal opinion is that the EX1K's harshness in the treble makes it uncomfortable on a lot of music, and I suspect the 4.4mm may make that worse, as the balanced output has more definiton.
If you can re-terminate to 4.4mm for a cheap cost, then you can try, and see for yourself.
If it is going to cost any significant amount of money, I would not bother, as the EX1K is 10+ years old, and there are better IEMs to apply that money to.
Having said that, I also see that there are users who love the EX1K over many other modern IEMs, so for those people, it would be worth the money to re-cable, or re-terminate the plug to 4.4mm. Re-cabling is also difficult, as the earphone connectors are custom, and not available, except from 3rd party sources, which have proven to be very hit and miss in quality and compatibility. (I've tried some of them. 2 sets could not be soldered, due to the composition)
If you find the treble can already be harsh on the current 3.5mm, then I would definitely say it is not worth it to re-cable or re-terminate the plug. Instead, put the money you would have spent on this towards a modern IEM, and just enjoy the EX1K on the 3.5mm cable/plug.
Edit: Another option is to try the conversion plug from custom Sony to MMCX, which Lunashops has. I have tried that, and got the 2nd set to work.
I think that answers me perfectly - if the converters are cost effective I will get some just to say I have tried