MOON 400M Power Amplifier
Best high fidelity component for discerning audiophiles seeking ultimate sonic clarity.
The MOON 400M monoblock power amplifier delivers effortless authority with 400W into 8Ω and 650W into 4Ω, making it an ideal choice for demanding audiophile loudspeakers. Its fully balanced differential circuitry and massive toroidal-based power supply provide exceptional control, fast transients, and refined musical detail. With Class A output to 10 watts and low distortion performance, the 400M preserves delicacy at low levels while staying composed at higher volumes. RS-232 and 12V trigger in/out round out a premium, install-friendly design built to anchor a high-end stereo system.
$4600.00
Owner Satisfaction
4.5
/ 5
Category Rank
1677
/ 2552
#1677 in Power Amplifiers
Price vs Category Average
-44%
Below average
Type
Mono (monoblock) power amplifier
/ Mono (monoblock) power amplifier
Who it's for
- Audiophiles seeking ultimate sonic transparency and immersive listening experiences
- Listeners with power-hungry or difficult-to-drive high-end speakers
- Discerning buyers prioritizing lasting quality and investment in their audio system
Who should skip it
- Budget-minded consumers or those new to high-end audio equipment
- Individuals with limited space or those preferring compact audio setups
- Casual listeners or those seeking a simple, plug-and-play audio solution
- Budget-conscious enthusiasts or those new to high-fidelity audio
- Homeowners with limited space or those preferring compact audio components
- Beginners building their first high-end system or those with mismatched components
Performance breakdown
Power Delivery
Massive 400W output handles even the most demanding loudspeaker loads effortlessly.
Transient Response
Fast, precise delivery ensures musical peaks remain sharp and perfectly timed.
Low-Level Detail
Class A operation preserves delicate nuances during quiet, intimate listening passages.
Build Integrity
Oversized toroidal transformer and robust circuitry reflect high-end engineering standards.
System Integration
Balanced inputs and trigger controls make professional system automation seamless.
Signal Purity
Fully balanced differential design keeps noise floors exceptionally low and clean.
Key Specs
Type
Mono (monoblock) power amplifier
Circuit / Configuration
Fully Balanced Differential, Mono
Class of operation
A/AB
Class A output
Up to 10 watts
Output power @ 8Ω
400 W
Output power @ 4Ω
650 W
Gain
36 dB
Frequency response (full range)
10 Hz – 125 kHz (+0 / −3 dB)
Features
- High-power monoblock performance
- Fully balanced differential circuitry
- Class A to 10 watts with A/AB operation
- Oversized power supply
- Wide frequency response and low distortion
- Integration-ready controls
What customers say
Customers consistently praise the MOON 400M Power Amplifier for its exceptional sound quality and robust build. Users frequently highlight its ability to deliver a powerful, clear, and detailed audio experience, noting impressive dynamics and precise imaging. The amplifier's elegant and substantial design is often celebrated, reinforcing its premium status. While representing a significant investment, the overwhelming consensus is that its sonic performance and lasting quality provide excellent value, establishing it as a cornerstone for serious audiophile systems. Reliability is also a frequently mentioned positive attribute.
Know before you buy
For the first 10 watts of output, the amplifier operates in pure Class A, which provides the most linear and refined sound quality. Once the signal exceeds 10 watts, it transitions to Class AB operation to provide the high-current power needed for demanding musical peaks.
Yes, the 400M is equipped with both balanced XLR and single-ended RCA inputs, allowing it to integrate easily into a wide variety of high-end stereo systems.
Absolutely. With 400 watts into 8Ω and 650 watts into 4Ω, the 400M is designed to maintain exceptional control and authority over even the most demanding audiophile loudspeakers.
A monoblock design means each amplifier handles only one channel, which eliminates crosstalk between channels and allows for a dedicated power supply for each speaker. This results in superior imaging, better separation, and a more expansive soundstage.
Yes, it features 12V trigger inputs and outputs for synchronized power-on with other components, as well as an RS-232 port for integration into custom home automation systems.
The 400M measures 16.9 inches wide, 3.5 inches high, and 14.0 inches deep. Its slim profile makes it easier to fit into standard audio racks compared to taller, traditional power amplifiers.
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