Acoustic Research - HiFi : AR-M2


MSRP: $999.99

High Fidelity Hi-Res Music Player
with Integrated Headphone Amplifier

Free Ground Shipping

Now you can experience the full impact of recorded files with the AR-M2 High Fidelity Hi-Res music player that features the state of the art audio engine based on Acoustic Research's proprietary M1 Music player. It enhances the accuracy in music playback by containing a flagship class Burr-Brown PCM1794 differential current output DAC and dual crystal oscillators.

AR Music Player runs on Android OS 4.3 and is equipped with Qualcomm MSM8926 processor, providing excellent playback stability. Additionally, AR has its own audio path application music player that gives the impact of AR's unique circuit "AR M-Class engine" realization. AR-M2 supports the audio framework of Android which allows for the use of third-party apps.

Key Components

Media Processor

Media Processor

Qualcomm Snapdragon 400 MSM8926 - Quad Core Cortex- A7 1.2GHz

Dual Voltage Controlled Temperature Compensated Crystal Oscillator

Dual Voltage Controlled Temperature Compensated Crystal Oscillator (VCTCXO)

High-performance 44.1kHz system (44.1 / 88.2 / 176.4kHz) dedicated, 48kHz system (48/96 / 192kHz) allows you to switch to full clock synchronization.

Audio-Centric Architecture

Audio-Centric Architecture

Audio sub-system acts as the clock master to the system. With audio data aligned at the audio sub-system, jitter is reduced.

Dual Operational Amplifiers

Dual Operational Amplifiers

Burr-Brown OPA2134, functions as a preamplifier and a low-pass filter.

Digital to Analogue Converter (DAC)

Digital to Analogue Converter (DAC)

Equipped with a Burr-Brown PCM1794A with the excellent performance of the flagship class. S / N: 129dB and the series best high-speed performance.


Headphone Amplifier

Equipped with a Texas Instruments TPA6120A2 configured to class A operation with 10.6Vpp output.

volume control

Volume Control

To respond to the high quality and powerful drive of headphone amplifier "TPA6120A2," independent of the OS, it adopts high-quality analog potentiometers for audio made of ALPS.

heat spreading

Volume Control

To respond to the high quality and powerful drive of headphone amplifier "TPA6120A2," independent of the OS, it adopts high-quality analog potentiometers for audio made of ALPS.



Headphone Output (3.5mm Standard Stereo Mini Plug) X 1

Line Output ( 3.5 Standard Stereo Mini Plug ) X 1

Headphone Amplifier

Class A configuration

Up to 3.6Vrms / 10.6Vpp unbalanced output

16 tp 600ohms

THD + N (total harmonic distortion plus noise) <0.001% at maximum output

AR-M2 output


Micro-SD XC slot : Up to 256GB

Expansion through USB flash memory is supported (FAT32 / exFAT file system; 5V 100mA power or lower)

AR-M2-External Storage


Internal battery capacity


Play time

Up to 8.5 hours (PCM) / 6.5 hours (DSD)
(Note: Updated based on 2.5.6 firmware with gapless playback)

Charging time

4 hours (AC adapter, USB connection to the computer, USB (micro-B) connector can be connected Smartphone Charger.)

AR-M2 Battery
AR-M2 Sound Effects


AR supplies this player with its own sound effects in high resolution precision.


Allows your sound to have a customized effect setting according the style genre you are listening to. (Music Genre: Normal, Classic, Dance, Flat, Folk, Heavy Metal, Hip Hop, Jazz, Pop, Rock, User)

Bass boost


Output voltage

Allows sound the extra added strengthening of bass

3D Effect

Allows sound to strengthen when played in any three-dimensional space

Verified and recommended Micro SD Cards:

Lexar 633x (Up to 200GB)

Patriot LX Series (Up to 200GB)

Samsung Evo, Evo+, Pro, Pro+ (Up to 256GB)

Toshiba Exceria UHS-I (Up to 128GB)


  • DISPLAY: 5" Touch Screen, 720x1280 HD image quality

  • SYSTEM REQUIREMENTS: Windows 10/ XP SP3/Vista/7/8 or newer / MAC OS X 10.6 or later
  • PLAY TIME: Up to 8.5 hours (PCM) / 6.5 hours (DSD) (Note: Updated based on 2.5.6 firmware with gapless playback)
  • BODY SIZE: 2.76in x 5.35in x .59in
Dimensions    Width: 2.76 In x Height: 5.35 In x Depth: .59 In
Weight (Kg/lb)    About 8.5 oz
Battery Type    4200 mAh, Up to 8.5 hours (PCM) / 6.5 hours (DSD)
Maximum Memory Expansion    Micro SDXC card (Up to 200GB), USB-OTG
CPU    Qualcomm MSM8926
Digital audio transceiver/clock master    Cirrus Logic CS8422
Pre-Amp (Voltage Amplification)    2 x OPA2134
Crystal clock sources for audio    Dual VCTCXO
Compatible Format Supported    FLAC/ALAC/DSD64/DSD128/WAV/DXD/APE/AIFF
USB Reader    Micro-USB (Data / Power / OTG*) *Support USB storage requiring less than 5V, 100mA power
DAC    Burr-Brown PCM1794a
Headphone Amplifier    TI TPA6120A2 / Class A Configuration / Up to 3.7Vrms Output
Volume Control    ALPS potentiometer (step-less full analogue)
Internal Memory    64GB
Wireless Network    802.11B/G/N
Audio Output    Line Out (3.5mm) Headphone Out (3.5mm)




by Daryl Horler , on 2016-Apr-08

I've had this unit for a week & am beyond thrilled with the sound quality! I'm pairing it with Sennheiser IE 800's for a sound that rivals center stage at some of my favorite clubs. Wattage stated honestly in the specs, no issues dragging CD rips onto SD card, sounds epic!! :)


by Tom Albrecht , on 2016-Apr-07

It may seem like a lot of money to spend for a portable music player, but make no mistake this is a piece of audiophile equipment. There arent enough adjectives to describe the exquisite sound of this player, extremely accurate, full sound with a low frequency sound that is beyond sublime