Reproductor Acoustic Research M2

Acoustic Research M2.  Reproductor portátil Alta Resolución con amplificador

Reproductor portátil de Alta Resolución. DAC Burr Brown PCM1794Am reproduccción de archivos WAV, AIFF, FLAC, DSD, DXD...

Pantalla de 5 pulgadas táctil

64GB de memoria interna
Batería con autonomia de 9 horas 

Clase A de auriculares.
Gracias a su Chip DAC Burr-Brown PCM1794a permite una respuesta rapida de máxima calidad, capaz de dar rienda suelta a los ficheros de alta resolución y disfrutar con auriculares de Gama Alta.
Soporta archivos de alta resolución (WAV, AIFF, FLAC, ALAC, APE, DSD, y DXD)
Procesador Quad Core,
Pantalla de 5” HD táctil alta resolución
Tecnología Wi-Fi incorporada 802.11n
Sistema operativo Android “modificado” para obtener la mayor calidad audiofila del sistema.
posibilidad de escuchar música Hi-Res con aplicaciones Como: Qobuz, Tidal, Spotify, Etc.
Incorpora 64GB de memoria interna y puerto para tarjeta Micro SDXC.
Autonomía de hasta 9 horas continuas de reproducción de música de grado audiófilo.

Key Features of the M2
- Flagship Class Burr-Brown PCM1794A Current Output DAC
- Future-proof High Performance Quad Core Processor
- Unique high-current high-output Class A based amplifier
- Audiophile-grade analogue volume ALPS potentiometer
- Line-out to feed a Hi-Fi system
- Phenomenal Signal to Noise Ratio & Dynamic Range

Quote: Arex Li - Designer of the M2
"We started with raw audio performance, then a powerful headphone amp and only then did we add the features"

- 5 inch OGS HD IPS colour display screen
- Easy-to-use Multi-touch “MusicSurf” GUI
- Android OS base, tuned for pure music
- Pure Lossless Audio Path bypassing Android OS totally
- High capacity battery 4000 mAH - 9hrs average battery life
- Duralumin metal housing - tough and good-looking

- Unlimited expansion via Micro-SXCD cards
- Full Wi-Fi streaming capability

Remarkably compact for a high-end player
136.5 h x 71.1 w x just 15 mm deep
Weight 245 gms

Flagship DAC Performance Ratings
Burr-Brown PCM1794A Current Output DAC
2 x better than Burr-Brown PCM1795
2.8 x better than Cirrus CS4398 (PCM mode)
4 x better than Cirrus CS4398 (DSD mode)
2.8 x better than Wolfson WM8740 (Dual DAC mode, 1-ch per DAC)
4 x better than Wolfson WM8740 (Single DAC mode, 2-ch per DAC)

High-power high-precision current feedback headphone amplifier
- High-power headphone amplifier
- Power output (THD < 0.01%)
- 32 ohms 400mW + 400 mW
- 300 ohms 43mW + 43mW
- Ultra-low-distortion at max output <0.01%
- Supports 16 ohms to 600 ohms headphones/earphones
- Ultra high slew-rate, genuinely responsive to Hi-Res contents

Future-proof High Performance Quad Core Processor
Plays virtually all Hi-Res audio formats including ALAC, FLAC, WAV, AIFF,
Plus DSD64/DSD128 & DXD
Custom developed Hi-Res DSP processing
Upgradeable to support other new formats

Wi-Fi wireless audio
NAS with DLNA support

Online music service Android APKs can be loaded
Spotify tested. Tidal & Qobuz in testing

Not a throwaway product
With a future-proofed processor capable of being upgraded to handle new formats, strong metal construction and virtually unlimited memory expansion, the M2 is built for a long-life.

Virtually unlimited expansion
64GB built-in memory
Micro-SDXC expansion Up to 200GB
USB OTG media playback support (TBD)
USB OTG Thumb Drive
USB Harddisk

DESIGN BACKGROUND
The acoustic & digital design of M2 was derived from AR's acclaimed desktop UA1 DAC, delivering real audiophile sound and Hi-Res playback on-the-go. Like UA1, the M2 features a dual-clock crystal oscillator design for native frequency support at all multiples.

The best DAC - Flagship DAC Performance Ratings
AR concluded that the Burr-Brown PCM1794A Current Output DAC deliver the best playback sound quality
2 x better than Burr-Brown PCM1795
2.8 x better than Cirrus CS4398 (PCM mode)
4 x better than Cirrus CS4398 (DSD mode)
2.8 x better than Wolfson WM8740 (Dual DAC mode, 1-ch per DAC)
4 x better than Wolfson WM8740 (Single DAC mode, 2-ch per DAC)

High precision Lossless Audio Path - Android Bypassed for audio
One major challenge in M2 development was the proprietary high precision audio path. Android offers a good control OS but the audio framework causes serious damage to sound quality.To get round this AR developed TWO audio paths.

1. A dedicated Hi-Res Lossless path for the AR Music Player, totally bypassing the Android OS
2. A clean generic path allowing for Android audio apps like Spotify & Qobuz.

AR High-Res Music Player
The simple but comprehensive AR music player, plays music through the M2's proprietary Hi-Res Lossless audio path. Compared to other music player software for Android, it simply delivers better sound.

Battery Life
The linear/class A amplifier delivers best sound with the penalty of high power consumption. The solution in M2 is to
include a battery with double the capacity of most competition, to give about 9 hours of playback. On top of that, M2 is
powerbank-friendly. Any 5V-2A Power Bank will power M2 for very extended music playback
charge it simultaneously.

Heat dissipation
There are copper heat spreader shields on both sides of the M2 PCB and is dissipated quickly over the whole body of the
player. The copper heat spreader serves as RF shielding as well.

Memory expansion
On top of built-in memory, the M2 supports expansion through both micro SDXC (up to 200GB card supported) and
USB-OTG flash storage (e.g. Sandisk Ultra Dual USB).

Large screen for touch operation
Instead of building a thick brick, we put the battery and the audio circuit board side by side. Although the player is
bigger, it is slimmer. This is better for heat dissipation and allows the use of large screen for easy touch operation.

Why Android?
Android offers a good operating OS BUT the OS audio framework caused serious damage to sound quality for best sound the M2 has its' own High-Res audio Path that bypasses the OS
, we decided to build a proprietary audio path for precision. The AR music player played music through the proprietary audio path. Compare to other music player software for Android, it simply delivered better sound.

- Mature touch based interface
- Mature wireless network support
- Third party app support (e.g. Amazon Appstore, Spotify, Qobuz, Tidal…)
- Efficient media scanning (fast scanning of huge number of songs based on tags)


The M2 was designed to be more powerful than many portable headphone amplifiers, it is an excellent choice to show off high-end headphones on the go.