Hi jemmons,
The H9000 does not have a way to change its outputs from balanced to unbalanced. It seems like the issue is that the input on the mixer is shorting the ring to ground, and that’s why you’re getting signal loss and phase cancellation. The best solution would be to either continue using TRS-to-TS adapters, since this fixes the issue, or picking up a DB25-to-TS cable instead.
