Yes, you can use BT Dongle #1 for the controller and BT Dongle #2 for the headphones.
Yes, you can use BT Dongle #1 for the controller and BT Dongle #2 for the headphones.
You're experiencing audio issues when using your Xbox controller and wireless BT headphones together, possibly due to bandwidth constraints on the BT connection. There seems to be no straightforward solution to assign a separate BT dongle for just the headphones—choosing between the two appears to depend on how you configure your setup.