When evaluating professional audio systems like Elder Audio (often associated with the Beta Three/B3 brand), you must focus on Transducer Quality, Frequency Response, and SPL (Sound Pressure Level). Ensure the speakers utilize high-grade neodymium or ferrite magnets for thermal stability. For line array systems, verify the horizontal and vertical coverage angles to ensure uniform sound distribution. Additionally, check if the built-in DSP (Digital Signal Processing) allows for precise crossover, equalization, and limiting to protect the drivers during high-output scenarios.