In order to allow higher input levels with the line audio input on AMIRA, an extended audio board is available for upgrade. This new audio board allows +24dBu input level in addition to the +8dBu with the IOAU 1 audio board. It also allows the headphone out to be looped through a connected mixer. The new audio board is available at the ARRI service stations as a chargeable upgrade. It is already included in cameras with serial numbers above 16541.