Unfortunately, this will be the first balanced headphone for many people. I actually bought (and sold) a Schiit Mjolnir to validate all my cables were working. The dual 3-pin XLR and single 4-pin XLR cables for my HD650 had never been tested. I don't know any other way to test other than to plug into a balanced amplifier
Can you use an amplifier from someone else to test your cables?
Can you use an amplifier from someone else to test your cables?