The MOON 400M by Simaudio is a high-performance monaural power amplifier engineered to deliver exceptional current delivery, control, and musical transparency for demanding loudspeaker systems. Designed as a true dual-mono solution in separate chassis, each 400M amplifier operates independently, ensuring complete channel isolation and optimal power delivery. Its robust power supply and high-current output stage allow the amplifier to drive complex speaker loads with authority, precision, and stability. The 400M excels at reproducing dynamic contrasts, deep bass impact, and fine low-level detail, creating a spacious and highly resolved soundstage. Built with Simaudio’s meticulous attention to circuit layout, thermal management, and component quality, the 400M offers reliable long-term performance and a refined sonic signature suited for serious audiophile systems. Sold individually, the MOON 400M is intended to be used as a matched stereo pair, delivering reference-grade amplification with exceptional clarity and musical engagement.