This video shows how to dismantle and modify the DT1990 to take a balanced input. The main job that needs doing is replacing the 3 pin miniXLR socket with a 4 pin one and re- wiring them internally.
You should be able to do this your self if you have decent soldering skills and a steady hand but we do offer a conversion service and also sell pre-modified pairs

Mods
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Pre-modified 1990s
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