MOON North Collection 861 Power Amplifier

MOON 861 Power Amplifier

The MOON 861 Power Amplifier is a reference-grade, dual-mono stereo power amp engineered to deliver effortless control, deep dynamic headroom, and ultra-low noise in high-resolution systems. With 300 W per channel into 8 Ω and 600 W per channel into 4 Ω, it drives demanding loudspeakers with calm authority, preserving a stable soundstage and fast transient response even at realistic listening levels. Built around MOON’s MDCA (MOON Distortion-Cancelling Amplifier) architecture and a no global feedback design, the 861 focuses on vanishingly low distortion and clean, uncompressed power delivery. Two custom low-noise toroidal transformers (900 VA each) and massive power supply capacitance (240,000 µF) support wide dynamic swings, while premium connectivity—RCA/XLR inputs, stereo/mono operation, MOONLink coordination, and smart standby modes—makes it easy to integrate into elite separates systems. The Moon 861 is part of ListenUp's Moon Power Amplifier Collection.

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What It's Good At:

• Delivering high-current, high-headroom power for demanding speakers (300 W/8 Ω, 600 W/4 Ω)
• Maintaining a wide, stable soundstage with ultra-low distortion and noise
• Producing fast, controlled bass and clean transients via a high damping factor
• Scaling effortlessly with high-end preamps and complex systems using dual-mono architecture
• Flexible system integration with balanced/unbalanced inputs, stereo/mono switching, and MOONLink coordination
• Reducing heat/noise impact in daily use with low-power standby operation

MOON 861 Full Specifications:

• Amplifier topology: Stereo power amplifier, dual mono configuration
• MDCA: MOON Distortion-Cancelling Amplifier
• Feedback topology: No Global Feedback Design
• Output power (Stereo 8 Ω): 300 W
• Output power (Stereo 4 Ω): 600 W
• Output power (Mono 8 Ω): 800 W
• Input sensitivity: 1.4 V
• Input impedance: 47 kΩ
• Gain: 31 dB
• Frequency response: 2 Hz – 100 kHz (+0 dB / –3 dB)
• Crosstalk: –119 dB
• Signal-to-noise ratio: 119 dB
• Total harmonic distortion + noise (@ 1 W): 0.002%
• Total harmonic distortion + noise (@ 300 W): 0.001%
• Total harmonic distortion (@ 200 W): 0.001%
• Intermodulation distortion: 0.002%
• Intermodulation distortion: 0.006%
• Damping factor: 900
• Power consumption (Idle): 85 W
• Power consumption (Full Power Standby): 75 W
• Power consumption (Low Power Standby): 1.25 W
• Power supply (dynamic capacity): Two custom low-noise toroidal transformers (2 × 900 VA)
• Power supply capacitance: 240,000 µF
• Inputs: Balanced (XLR), Unbalanced (RCA)
• Input selection: BAL./UNBAL. switch (activates balanced or unbalanced inputs)
• AC/DC coupling: AC/DC Coupling switch (DC blocking option)
• Mode: Stereo/Mono switch (bridges channels for monoblock operation)
• Speaker outputs: Binding posts (+/–) for left/right channels
• MOONLink: MOONLink port for coordinated startup/standby with compatible MOON components
• Network (RJ-45): Ethernet connections for MOONLink functionality and network pass-through/extension
• 12V trigger: 12V Trigger In / 12V Trigger Out (mini-jack TS) for standby synchronization and daisy-chaining
• Standby behavior: STDBY MODE switch (standby electronics power-down options)
• Power: Rear-panel power switch (I/O)
• AC input: For connecting the power cable
• Fuse: Internal fuse magazine for power supply fuse
• Fuse rating (120 V / 240 V): F 15A H 250V 3AG / F 8A H 250V 3AG
• Dimensions (W × H × D): 18.95 × 8.26 × 24 in (48.1 × 21 × 60.9 cm)
• Dimensions (L × H × D): 48.1 cm × 21.0 cm × 60.9 cm / 18.95 in × 8.26 in × 24.0 in
• Shipping weight: 155 lbs / 70 kg
• Shipping weight: 57 kg / 125 lbs
• In the box: Owner’s manual, AC power cable, 1 spare fast-blow fuse, MOONLink, warranty/registration information (USA and Canada only)
• In the box (also listed): Quick Start Guide, Power Cable, Ethernet Cable, Warranty Registration Card (Canada & USA only)

MOON 861 Q&A:

What speakers can the MOON 861 drive effectively?

With 300 W per channel into 8 Ω and 600 W per channel into 4 Ω, the MOON 861 is built for demanding loudspeakers and large rooms, delivering high-current control and strong dynamic headroom.

Does the MOON 861 support mono (bridged) operation?

Yes. A rear-panel stereo/mono switch allows the 861 to bridge into mono operation, delivering 800 W into 8 Ω for monoblock-style setups.

What input connections does the MOON 861 provide?

It includes both balanced XLR and unbalanced RCA inputs, plus a BAL./UNBAL. switch to select the active input type.

What is MDCA and why does it matter?

MDCA (MOON Distortion-Cancelling Amplifier) is designed to reduce distortion and noise to extremely low levels, helping the amplifier sound clean, stable, and controlled even at high output.

How much power does the MOON 861 use in standby?

Low Power Standby is rated at 1.25 W, and Full Power Standby is listed at 75 W, giving you flexibility between efficiency and faster “ready” performance.

Can the MOON 861 coordinate power/standby with other MOON components?

Yes. It includes MOONLink connectivity and also supports 12V trigger in/out for synchronized standby behavior across multiple components.

Is there a way to block DC from upstream components?

Yes. The AC/DC Coupling switch can enable DC blocking, which is useful if a preamp outputs DC or if the amplifier frequently triggers DC protection.

What comes included in the box?

Documentation (owner’s manual/quick start), a power cable, MOONLink, a spare fast-blow fuse, and warranty/registration materials (with some items varying by region listing).

MOON 861 Downloads:

MOON 861 Manual

MOON North Collection Video: