You can get a balanced cable for grado sr 225e?
Yes, four ways to do it
1. open up the cups and install new balanced cable
2. cut and re-terminate the 1/8 end with balanced plug
3. cut the cables by the cups and install plugs so you can switch cables between SE and balanced
4. install jacks in the ear cups so you can change cables easily between SE and balanced
FWIW, heard a GS-1000e on a balanced setup and didn't make a difference from SE