A multifunctional machine as an image forming apparatus according to the present disclosure includes a speaker and can function as an output apparatus for use in a PA system such as an in-house public address system. During a period in which no sound is being outputted from the speaker, the multifunctional machine operates in a normal mode. Meanwhile, during a period in which a sound is being outputted from the speaker, the multifunctional machine operates in a low-speed mode that is lower in speed than the normal mode. This makes it easy to hear a sound that is outputted from the speaker. In a case where a drive mode of a drive controller switches from either of the normal and low-speed modes to the other at a timing during execution of a process according to a certain job, the drive mode switches after completion of the process.