Yes, you can use the 9320A Reference Controller with any headphones.

However, the PRM (Personal Reference Monitoring) solution is designed to deliver the highest accuracy when paired with the factory-calibrated 8550A Reference Headphones included in the system. This combination—8550A headphones and 9320A controller—offers optimal performance, as the headphones are specifically engineered to work with the controller’s integrated headphone amplifier.

While other headphones are supported, for the most precise and reliable monitoring experience, we recommend using the 8550A headphones.