Zone and utility outputs all have individual source selectors and level controls, while two zones are stereo/mono selectable. Each zone can select between any of three input sources. When the microphone is in use all zones broadcast the signal, however the sound level is determined by the microphone volume level and ducking depth. The utility output can select from any one of three source inputs or the microphone.

An emergency interface allows for insertion of an emergency paging system or microphone. In the case of an emergency, all sources are automatically overridden and the emergency message is broadcast to all zones and the utility area. The ZX4 zone mixers are 1 RU rack mountable units.