Moon by Simaudio Compass 461 Amplifier. In-Store sales only.

We at Sunny’s have 2 amplifiers arriving for Demonstration. If you are going to THE SHOW in Costa Mesa, please visit us on the Second floor. The MOON 461 is an analog power Amplifier designed to amplify the signal
from a preamplifier or other source component with absolute accuracy. As the most powerful
model in the Compass Collection, it is engineered to deliver high current capability,
low distortion, and stable performance across a wide range of loudspeaker loads.
Its design is centered on preserving the integrity of the incoming signal while maintaining
transparency, dynamic expression, and composure under demanding conditions.

The 461 stands as the most powerful Amplifier
in the Compass Collection and pairs naturally
with the MOON 491 network player/preamplifier
to deliver the highest level of system performance
in the Collection. Its purpose is clear: to provide substantial
output capability, strong channel separation, and low-distortion amplification in a compact, elegant chassis.
The result is an Amplifier designed for systems that demand
both refinement and headroom, achieved through
a focused, efficient, and thoughtfully engineered design.
A continuous pursuit of absolute accuracy, transparency, and dynamic

capability drives the design philosophy of the 461. Rather than imparting a sonic signature,
the Amplifier is engineered to maintain signal fidelity,
preserving low-level detail, harmonic structure, and linearity
across the entire frequency spectrum. From delicate
passages to large-scale transients, the 461 maintains
consistent performance without compression or strain.
MOON Distortion-Canceling Amplifier (MDCA),
represents the latest evolution of more than four decades
of research and development in high-performance analog
Amplifier design. While it is not derived from previous
topology, this Class AB amplification technology reflects
the cumulative knowledge gained through numerous
award-winning MOON Amplifier designs. MDCA operates
on a fundamentally different principle than traditional
feedback-based amplifiers, aiming to eliminate distortion
and coloration without placing corrective circuitry directly
in the audio signal path. Instead, the MDCA circuit
compares the input signal to the amplified output
in real time, isolates the generated noise and minute,
non-linear errors, and injects a precise correction signal
directly into the output stage. Because this error correction
process takes place outside of the main signal path,
distortion is reduced more efficiently while simultaneously
lowering output impedance and improving the damping factor.
The design is fully DC-coupled and naturally rejects
unwanted DC without the need for a servo circuit,
and delivers wider bandwidth, lower noise, and significantly
reduced distortion compared with the previous MOON
amplification platforms. The result is an Amplifier
that combines measurable technical advances with greater
clarity, control, and musicality.
The Amplifier uses two proprietary MOON Hybrid Power
supply modules (MHP), one dedicated to each channel.
MHP is a proprietary power supply architecture designed
to deliver a stable, low-noise, and high-current energy
source to the Amplifier under all operating conditions.
At its front end, a high-performance Power Factor
The correction (PFC) stage actively converts the AC mains
to a high-voltage DC rail of 400 V. This high-voltage rail
feeds a high-frequency LLC resonant converter operating 

Output Power (Stereo 8 Ω): 150 W
Output Power (Stereo 4 Ω): 300 W
Output Power (Mono 8 Ω): 450 W
Input Sensitivity: 1 V
Input Impedance: 22 kΩ
Gain: 31 dB
Frequency Response: 5 Hz – 100 kHz +0/-3 dB
Total Harmonic Distortion + Noise (@ 1 W) : 0.005%
Total Harmonic Distortion + Noise (@ 150 W) : 0.003%
Intermodulation Distortion: 0.005%
Signal-to-Noise Ratio: 114 dB
Crosstalk : –114 dB
Damping Factor: 425
Power Consumption (Idle): 35 W
Power Consumption (Full Power Standby): 34 W
Power Consumption (Low Power Standby): 1 W
Dimensions (width x height x depth) : 16.9x3.5x14.5 in / 42.9x8.7x36.8 cm
Shipping Weight: 24 lbs / 11 kg