LA4 is a four-channel power amplifier from L-Acoustics designed for professional touring and installation applications. Each channel uses Class D amplification for high efficiency and compact heat dissipation. The unit is designed for reliable operation in demanding environments, with robust mechanical construction and standard rack-mountability. The amplifier provides independent channel protection features, including over-current, over-temperature, short-circuit, and DC fault protection, plus clip limiting. It also offers status indicators and basic fault isolation to simplify system servicing. It is intended to integrate with L-Acoustics loudspeaker and processing ecosystems within standard event production workflows.