

MOON by Simaudio
The feature-rich MOON 681 draws upon stunning MOON design and advanced digital audio technologies to deliver a seamless experience with the 641 and to serve as a complete digital front end to any analog amplifier.
681 Network Player / DAC
A beautiful 4.3’’ OLED screen displays cover art with song and artist names, while the BRM-1 remote control and MOONLink communication make it a pleasure to operate and integrate within a complete MOON system. MHV (MOON Hybrid Volume) technology employs a clever combination of digital attenuation and analog gain levels to allow for high-performance volume control when the 681 is not connected to a MOON preamplifier without compromising the audio signal in the digital domain.
At the heart of the 681 is the MDE1, a re-clocking FPGA with an innovative DAC implementation to convert audio with industry- leading accuracy. Equipped with a MiND2 network player, the 681 accesses music from TIDAL, Qobuz, Deezer, and HighResAudio, is compatible with, Bluetooth, AirPlay 2, Spotify Connect, and TIDAL Connect, is Roon Ready, decodes all two-channel digital music formats—including MQA and DSD—and can synchronize with other MiND2 products to create a whole home experience!
Designed to accompany the 641, the 681 transforms any digital audio source into a revealing audio signal to complement any amplifier. The 681 and 641 are archetypes of the streaming DAC and integrated amplifier, and proof of the superlative mastery of MOON engineering.
Design features
The North Collection
This landmark range represents a culmination of years of research and development in the fields of audio, electronics, materials, and manufacturing processes. Its stunning aesthetic design is surpassed only by the improvements in its performance, made possible by the passionate team of engineers and technicians dedicated to delivering an uncompromised music listening experience. The North Collection embodies the spirit of Canada, each product reflecting the company’s passion for premium audio design and exceptional sound reproduction, delivering features and performance that will delight music lovers around the world.
The North Collection incorporates ground-breaking MOON technologies—including the MOON Distortion Cancelling Amplifier (MDCA) circuit that reduces distortion and noise to previously unattainable levels, the MOON Damping Base (MDB) that raises the bar on mechanical isolation, and updated volume technologies for ultimate control. Premium MDE digital converters in the North Collection were designed and tuned to heighten every digital performance, and intelligent MOONLink connectivity ensures the symbiotic interoperability of all the devices.
Operating the North Collection is effortless with the intelligent MOON BRM-1 remote control featuring the luxurious MOON volume knob, ground-breaking touch controls, visual feedback, and lavish refinement. This exceptional product is calibrated to deliver celebrated MOON precision and guarantees enjoyment with every model.
Beautiful new OLED colour screens feature on four of the products in the North Collection. These advanced displays showcase cover art, song and album titles, and artist names in brilliant detail, as well as volume and a setup menu. The combination of the BRM-1 remote and the new OLED screen elevates the MOON experience to an exclusive tier.
Every model in the North Collection boasts new vertical heatsinks and timeless MOON styling for improved performance. Handcrafted details and the iconic MOON control knob, ensure that the North Collection commands admiring glances wherever it is experienced.
Created to express the finest nuances in every recording and to offer unrivalled listening pleasure, the North Collection is the range that MOON lovers have been craving. Look North to discover this uncompromising new range of truly unparalleled hi-fi equipment.
In the box
Owner’s manual
AC power cable
BRM-1 intelligent remote control
2 x Wi-Fi antenna
MOONLink
Warranty and product registration information
Analog Input Impedance
50 kΩ
Output Impedance
50 Ω
Crosstalk
–125 dB
Frequency Response
2 Hz – 100 kHz (+0 dB / –3 dB)
Signal-to-Noise Ratio
120 dB
Dynamic Range
125 dB
Total Harmonic Distortion + Noise
0.0003%
Intermodulation Distortion
0.0002%
Power Consumption (Idle)
15 W
Power Consumption (Full Power Standby)
12 W
Power Consumption (Low Power Standby)
5 W
Shipping Weight
40 lbs / 18 kg
Dimensions (width x height x depth)
18.95 x 4.03 x 16.80 in
48.1 x 10.2 x 42.7 cm
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