MOON 850P – Reference dual mono two-chassis preamplifier

The MOON 850P by Simaudio is one of the most exclusive and sophisticated line-stage preamplifiers ever created in the world of high-end audio. Designed as a true statement component, the 850P combines a fully balanced dual mono architecture with a two-chassis configuration engineered to achieve complete isolation between the power supply, digital control circuitry and analogue audio stages.

The design philosophy behind the MOON 850P is simple yet uncompromising: reduce background noise to the lowest possible level while preserving absolute signal purity, dynamics and musical realism. One chassis houses only the analogue audio circuitry, while the second chassis contains the power supply, digital controller, software management and LED display, eliminating electrical and mechanical interference from the signal path.

The MOON 850P employs a sophisticated fully differential circuit topology with no global feedback and absolutely no capacitors in the audio signal path. Its proprietary M-Ray / M-eVOL volume control system uses precision relay-switched thin-film resistor networks, delivering absolute transparency, perfect channel matching and more than 500 ultra-precise volume adjustment steps.

The oversized dual mono power supply features custom low-noise toroidal transformers, extensive filtering and multiple dedicated regulation stages for every critical circuit section, ensuring exceptional silence and outstanding operational stability.

Mechanical construction is truly reference-grade, featuring a high-mass chassis, fully symmetrical internal layout, proprietary M-Octave vibration-damping system and carefully matched premium-grade components.

During listening sessions, the MOON 850P delivers extraordinary transparency, an impressively holographic soundstage and unrestricted dynamics. Bass response is lightning-fast and perfectly controlled, the midrange is remarkably realistic and textured, while treble remains refined, extended and effortlessly natural. Its exceptionally black background allows micro-detail, ambience and harmonic nuances to emerge with stunning realism.

The MOON 850P is the ideal partner for reference-level high-end power amplifiers, fully balanced audio systems and uncompromising audiophile installations.

Key Features

• Reference two-chassis line-stage preamplifier
• Fully balanced dual mono architecture
• Separate power supply and audio circuitry chassis
• Fully differential no-global-feedback topology
• Proprietary M-Ray / M-eVOL volume control
• 530 ultra-precise volume steps
• No capacitors in the audio signal path
• Proprietary M-Octave anti-vibration system
• Configurable XLR and RCA inputs
• Dual balanced and single-ended outputs
• SimLink, 12V trigger, RS-232 and programmable IR
• Reference-grade construction Made in Canada

Technical Specifications

• Type: dual mono line-stage preamplifier
• Configuration: fully balanced differential design
• Architecture: separate dual-chassis construction
• Circuit topology: no global feedback
• Volume control: precision relay-based M-Ray / M-eVOL
• Volume steps: 530 levels
• Balanced inputs: 3 pairs XLR
• Single-ended inputs: 4 pairs RCA
• Monitor loop: 1 pair RCA
• Balanced outputs: 2 pairs XLR
• Single-ended outputs: 2 pairs RCA (fixed + variable)
• Gain: 9 dB
• Input impedance: 11,000 Ω
• Output impedance: 50 Ω
• Signal-to-noise ratio: 130 dB
• THD: < 0.0005%
• Frequency response: 5 Hz – 100 kHz ±0.1 dB
• Crosstalk: -130 dB @ 1 kHz
• Controls: SimLink, RS-232, IR, 12V triggers
• Dimensions per chassis: 47.6 x 10.1 x 41.9 cm
• Total weight: approximately 32 kg
• Manufacturing: Made in Canada

The MOON 850P is one of the finest high-end preamplifiers ever built, engineered to deliver absolute transparency, unlimited dynamics and truly reference-level musical reproduction.