In a PA system, what does “line level” refer to?

"Line level" refers to the standard signal level for audio transmitted between devices, typically indicating that the audio signal is at a level suitable for processing and amplification before being sent to speakers. This standard voltage level is significantly higher than that produced by microphones, allowing for reduced interference and more consistent performance across various devices.

In a professional audio setup, line level is used to connect different equipment, such as mixers, processors, and amplifiers, ensuring that the audio signal retains its quality and integrity while being distributed throughout the system. This is essential for maintaining audio fidelity, as the devices are optimized to work with these standard levels rather than the lower levels associated with microphones or other sources. Therefore, understanding line level is crucial for anyone working with audio systems, as it directly impacts how equipment interfaces and communicates with one another.