audio-sound @ hatena

An audio review & news blog. The volume should not exceed 80 dB is recommended. I usually adhere to the safe-listening style by WHO. Please note that my aural impressions and interpretations of measurements are also made from a safe-listening style.

(News) The latest portable Bluetooth & USB DAC + headphone amplifier "Aune BU2" is here!

Aune BU2

Aune BU2


Aune audio is a well-known HiFi audio equipment brand that produces DACs and amplifiers for portable and desktop audio.


Today, Aune announced its latest portable Bluetooth/USB DAC/headphone amplifier, the Aune BU2. It is a direct upgrade of the Aune BU1 DAC+Headphone Amplifier, featuring a better DAC and improved AMP chipset, an added 2.5mm balanced output, Bluetooth connectivity, and the latest USB Type-C interface.


The BU2 delivers the power of two latest generation Sabre DAC chips with the architecture of a separate headphone amplifier. It uses the single-to-dual positive and negative voltage power supplies of the highly acclaimed Aune B1 headphone amplifier. the Aune BU2 features Dual ES9318 DAC chips and four independent amplifiers in a compact chassis. In addition to USB Type-C connection, the Aune BU2 can also be connected to smartphones and other devices via wireless Bluetooth connection.


The Aune BU2 is available for purchase for $349.99. For more information, please visit here.


Aune BU2


Features of Aune BU2

  • Support for master tape level decoding
  • Supports native decoding of high-resolution 32bit/768kHz PCM and DSD512
  • Equipped with two ES9318 high-performance DAC chips
  • Four independent headphone amplifiers
  • Natural expression with Clock Synchronisation Technology
  • Multi-function volume knob
  • Precise volume control with R2R ladder network
  • Reference-grade natural sound tuning
  • Dual headphone output jacks: 3.5mm single-ended and 2.5mm balanced
  • USB Type-C input interface
  • Bluetooth input support
  • Output level: 1.8Vrms (3.5mm), 3.6Vrms (2.5mm)
  • THD+N: 0.000145
  • S/N ratio: -120dB
  • Frequency response range: 20Hz to 20kHz
  • Output power (2.5mm Bal): 265mW max @ 32Ω
  • Output power (3.5mm SE): 100mW @ 32Ω


Take your high-resolution music anywhere you go

Aune BU2 turns your smartphone into a master tape-level decoding player. Aune BU2 is equipped with a high-performance dual DAC chipset with two ES9318 DAC chips of the latest generation. Just by connecting the Aune BU2 to your smartphone, you can easily enjoy the decoding of high-resolution audio signals. You can also connect your smartphone to the BU2 wirelessly via Bluetooth, or to a Windows/Mac PC.


High-Resolution PCM & DSD Decoding

The dual high-performance DAC chipset in Aune BU2 brings excellent audio signal decoding characteristics to this unit. It can decode high-resolution 32bit/768kHz PCM and Native DSD512 signals. It maintains a lower noise floor, higher dynamic range, and cleaner background in the output signal.


Four independent amplifiers to maximize the potential of the Aune BU2

The AUNE BU2 features the reliable low ripple positive and negative pump power circuits of the classic B1 headphone amplifier. With dual ES9318 Sabre DAC chips and four independent amplifiers, the Aune BU2 can easily provide the drive power you need for your favorite IEMs and headphones.


Dual Low-Jitter Crystal Oscillators for Digital Audio Clock Synchronization

Aune Audio, the technology giant behind many successful desktop-grade clock systems, has implemented two low-jitter 45M/49M crystal oscillators that are synchronized with the DAC chip by a USB chip to ensure a properly synchronized audio chain in your pocket. In addition, it can be used as a standalone device.


Accurate Volume Control with R2R Volume Technology

The Aune BU2 features Dynamic Volume Control Technology, which consists of an electronic switch and R2R ladder network. At low volume levels, R2R provides subtle volume control with a precisely matched resistor array. This allows for precise volume control for IEMs/headphones with different impedances.


Multi-Function Knob Button

There is also a button hidden under the volume knob; all settings and controls of the Aune BU2 can be done with this volume knob only.


Aune BU2


Price and Availability

The Aune BU2 is available for only $349.99 and offers great performance for the price. For more information, please click here.


As with other products, HiFiGO offers free express shipping worldwide for orders over $500. We also offer free priority shipping to certain areas for orders over $100. More information about our shipping policy can be found here.


Purchase link