What component is essential for managing audio signals in an AV system?

An audio mixer is essential for managing audio signals in an AV system because it allows for the combination and manipulation of multiple audio sources. This component enables users to adjust levels, balance the sound, EQ audio, and apply effects, ensuring that various audio channels can flow smoothly and cohesively. In practice, an audio mixer facilitates the integration of different sources, such as microphones, musical instruments, and playback devices, allowing for real-time control over the audio output. Its functionality is crucial in environments like live events, recording studios, and presentations where clear and balanced sound is vital for effective communication and audience engagement.

In contrast, a video switcher manages video signals rather than audio, directing different video inputs to a single output for visual presentation. A signal amplifier enhances audio signals but does not manage or mix them, and a projection module primarily serves to display visual content rather than process or control sound. Thus, the audio mixer is specifically designed for audio signal management, making it the correct answer.