The audio processor has multiple interfaces—what are their functions? What do 'input' and 'output' mean? How does the number of inputs differ from the number of outputs?

First, clarify what constitutes entry and exit.
• Input = Sound entering through microphone, computer, player, or      mixing console → processed by audio processor

• Output = Sound exiting after processing → delivered to amplifier → sent to speakers

In short: Input is the audio source, output connects to speakers.

Common audio interfaces typically include the following types:

Input interfaces (IN):

• AES/EBU: Digital audio input (for professional equipment)

• OPT/COAX: Fiber optic/coaxial connectors (for TVs and playback devices)

• Analog RCA: For computers, smartphones, and DVDs

• XLR/6.35mm three-pin: For mixing consoles, microphones, and amplifiers.

Function: Delivering audio signals to processors for processing (noise reduction, equalization, compression/limiting, frequency division, delay adjustment, etc.)

Output Interface (OUT)

• The most common types include Cannon, Big Three Core, and Phoenix terminals

• Each output channel corresponds to a single speaker or speaker array

Function:  it delivers processed audio signals to the amplifier before routing them to the speakers.

Other interfaces:

• RS485 and RJ45 network ports: For computer debugging

• Power supply: For power

• GPIO: For central control, alarm, and interlocking control (rarely used)

What is the function of multiple entries and exits?

Taking the M480 digital audio processor as an example, it features a 4-in-8-out configuration. The 4-in configuration allows up to 4 audio signal inputs, while the 8-out configuration supports up to 8 speaker groups. The more inputs, the more sound sources can be received simultaneously.The more outputs, the more speakers can be controlled and the more precise the sound field.

Additionally, the M480 digital processor features not only front-panel operation but also a USB Type-B (square connector) for computer connectivity. With the corresponding debugging software installed, users can perform precise audio parameter adjustments on the computer.