Passive power amplifier with DSP. It analyzes the input signal, controls output power, and optimizes frequency response and timing to minimize speaker distortion. The four-channel unit provides up to 300 W per channel at 8 Ω, with protective features including peak limiting, overheating protection, DC output protection, and undervoltage protection. It offers per-channel monitoring of temperature, voltage, current, and fault status and operates over a wide input voltage range (90-250 V).