Audeze LCD-GX - Official Thread

Howdy y’all,
When A/B-ing my GX I noticed a channel imbalance. Essentially starting from zero and slowly dialing it up, no audio comes from the left driver, until about 8 o’clock. I’ve tried different cables. I also tried my DT 990s on the same amp. The amp is a Schiit Heresy. Thoughts or things I can try?