The Moon by Simaudio 641 North Collection power amplifier embodies the brand’s pursuit of refinement, authority, and absolute sonic purity, delivering the kind of performance expected from a true reference-class component. With 125 W per channel into 8 ohms—and a commanding 250 W into 4 ohms—the 641 engages loudspeakers with effortless grip, speed, and control, supported by a massive damping factor of 700 that keeps bass lines deep, taut, and impeccably accurate. Its ultra-wide 2 Hz–90 kHz frequency response and low distortion figures, including a vanishingly low 0.003% THD+N at rated output, reflect a design engineered to preserve transparency and harmonic integrity at every listening level. The 641’s remarkable 109 dB signal-to-noise ratio and tightly managed crosstalk ensure a silent backdrop, allowing imaging, spatial cues, and microdynamics to bloom with holographic precision. Built within the North Collection’s elegantly sculpted chassis, the 641 blends luxury craftsmanship with uncompromising engineering, featuring premium componentry, advanced thermal management, and the iconic MOON design language. With flexible input sensitivity from 300 mV to 6 V and meticulous attention to noise rejection, the 641 integrates seamlessly into high-end systems while elevating overall musical realism. Powerful, nuanced, and unmistakably refined, it represents the pinnacle of Simaudio’s modern amplifier philosophy.