This issue occurs if you plug in a pair of transducers connected by an Apple DAC and tap Other Device in the confirmation popup. Selecting this option may result in the transducers not performing as expected.
To correct the issue, you will need to follow the steps below depending on whether the transducers are still plugged in to the iPad.
Device is still plugged in
If the device is still plugged in to the iPad, you can set the device type in the iPad’s sound settings. To do this, follow the instructions below:
On your iPad, go to Settings > Sounds > Headphone Safety.
On the Headphone Safety screen, tap USB Audio Accessories.
On the USB Audio Accessories screen, set the Connected to Headphones toggle to match your device:
If the device is a pair of transducers, set the toggle on.
If the device is a microphone, set the toggle off.
Device is no longer plugged in
If the device is no longer plugged in to the iPad, you will need to remove all devices assigned to the iPad’s memory. To do this, follow the instructions below:
On your iPad, go to Settings > Sounds > Headphone Safety.
On the Headphone Safety screen, tap USB Audio Accessories.
On the USB Audio Accessories screen, tap Forget All USB Audio Accessories.
In the confirmation popup, tap Forget All USB Audio Accessories. This removes all assigned audio devices from the iPad’s memory.
You can now plug your devices in to the iPad again.