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FURUTECH Alpha Design Labs A1 Portable Headphone Amplifier Alpha Design

Original Price $551

Member $551

Type A1

ADL A1  |  Alpha Design Labs A1

• DSD (2.8M/ 5.6M) DAC • Android DAC • USB DAC (24bit/ 192kHz Max.) • DDC (Optical input and output 24bit/ 192kHz Max.)


Please download and follow the NEW guide for the driver installation on Windows 10 Anniversary Update PCs: HERE

For users that upgraded their OS from Windows 7 or 8 to the new Windows 10 and the above installation guide does not work on your PC, it is possible to roll back the Windows 10 Anniversary Update and return to the previous installed version of Windows 10.
(see this video for tutorial: https://www.youtube.com/watch?v=DTGxB0s_HXw )
You will also need to disable the Windows automatic update function.
(see this video for tutorial: https://www.youtube.com/watch?v=m-bmRe0VEeQ )
Then you will be able to install the driver on Windows 10 OS computers and use the A1 without issue.

A1_description On-the-Go-Or-In-Your-Stereo


Some digital enthusiasts require small, portable DACs and headphone amps because they’re always on the move from location to location. Others need flexibility with their digital gear, especially the ability to insert a headphone amp into virtually any system and achieve impressive sonic performance. The new ADL A1 headphone amplifier/ DAC is designed for both of these digital enthusiasts—even if they’re the same person!

The new ADL A1 is a high-resolution portable headphone amplifier and DAC that can be used with Android devices such as ADL’s own X1 and iDevices. The A1 is also DSD-capable when used with either Mac or PC. The high-resolution sound that can be achieved through the A1 makes it perfect for portable audio enthusiasts who use the highest quality headphones to delve deeply into a recording. It’s also ideal for those who want to run DSD 2X on either a laptop or a desktop.

While the ADL A1 is certainly small enough to be portable and convenient, it’s also loaded with innovative features such as:

• USB Mini-B socket for USB A output from a PC/Mac for music and to charge the battery

• USB A socket for Android music devices via OTG cable

• Optical and line out that combines a 3.5mm phone jack for line out with a mini-jack for optical output

• Additional 3.5mm jack for headphone output

• USB 2.0 high-speed compliance with DSD (2.8M and 5.6M data both supported), with the ability to sample 8, 16, 32, 44.1, 48, 88.2, 96, 176.4 and 192 kHz sampling rates, indicated by LEDs on the front panel

• Switchable between USB-A, USB-mini B and optical inputs

The portable audio enthusiast will also appreciate the A1’s long battery life. While the battery in the A1 lasts approximately 7.5 hours after a full charge, it can be completely recharged in around 5 to 5.5 hours. That provides an exceptional amount of flexibility for playback while on the go. Down time and scheduling concerns will be minimized.

The ADL A1 is a truly versatile portable headphone amplifier and DAC. It’s flexible enough to be used in a countless number of applications, it’s small enough to fit just about anywhere and the sound quality is extraordinary. You’ll appreciate the signature Furutech sound in every component offered by ADL—smooth yet detailed and focused. The ADL A1 is clearly an example of innovative Japanese design at the cutting edge of technology. Are you ready for it?



  • High-performance CIRRUS LOGIC CS4392K 24bit/192kHz DAC chip (accepts PCM data and DSD audio data )
  • Controller supports ASIO and Asynchronous mode
  • VIA VT1736 32bit/192kHz USB chip ,USB 2.0 High Speed compliant accepts DSD 2.8M or 5.6M signal & 44.1 /48 /88.2 /96 /176.4 /192 kHz sampling rates supported
  • TEXAS INSTRUMENTS TPA6130A2 Headphone Amplifier chip -TPA6130A2 high fidelity Stereo Headphone Amplifier with an SNR of 98 dB
  • OP AMP: TI- LME49726 High Current, Low Distortion, Rail-to-Rail Output Audio Operational Amplifier
  • Max Headphone Output Levels (at 1%THD 1KHz) : 70mW(12 ohm), 80mW(16 ohm), 65mW(32 ohm), 38mW(56 ohm), 9mW(300 ohm)
  • Charge Time: approximately 7 hours approx. (DC 5V, 0.5A USB bus power)
  • Charge Time: approximately 5~5.5 hours approx.(AC/DC 5V, 1.0-2.0A switching adaptor)
  • Music Playback Time: Up to 7.5 hours when fully charged
  • Size: 68(W) x 118(D) x 16.5(H)mm
  • Weight: 150g approx.

ADL A1 compatible devices


    Applicable Android Device as of 2015.
  • SONY --- SONY --- Xperia Z5 , Xperia Z4 , Xperia Z3 / Xperia Z3 Compact, Xperia Z , Xperia Z1 , Z1 Compact ( Xperia Z1f ) , Xperia A (Xperia ZR) , Xperia Tablet Z , Xperia V
  • SAMSUNG --- GALAXY Active neo , GALAXY Note Edge , GALAXY Note3 , GALAXY Note II , GALAXY S4 , GALAXY S3 , GALAXY S5 , GALAXY S3 mini , GALAXY S5 mini , Galaxy S6 , Galaxy S6 Edge (not supported - GALAXY S3 mini & S4 mini)
  • HTC (Android 4.2) --- J butterfly , J One.butterfly , New One , HTC One (M7)
  • HTC (Android 4.3) --- HTC One (M8) , HTC One X

    Note* HTC One (M7) running v4.3,v4.4.2 not supported
  • HTC (Android kitkat 4.4.X) --- HTC One M8
  • InFocus --- IN810
  • Compatible with Android version 6.0 marshmallow



  1. Recommended PC requirement for DSD playback: CPU duo core 2.0G or above; RAM 2GB or above
    * Please check if the ADL A1 ASIO icon is on the desktop screen to confirm successful installation.
    * Please also adjust the ASIO Buffer Size to maximum to ensure smooth playback.
  2. A1 supports 16bit/176kHz, but does not support 24bit/176kHz
  3. A1 does not support digital signal from iDevices
  4. A1 does not support HTC Android 4.3
  5. A1 does not support SPDIF out from DSD playback
  6. At low A1 battery charge the Android signal may disconnect
  7. Adjust the Foobar output function Buffer length to 1030ms to ensure smooth playback.
  8. When the battery charge of the Android device runs low (10~20%), music playback may stop.
    Reason: Android devices are programed to cut digital signal output at low battery charge.

    When playback is initiated on the connected Android device or during playback, sound comes from the Android device and not the A1
    Reason: Battery charge on the A1 is too low to receive digital signal input from Android device. ※Notice regarding the A1’s front panel indicator:
    ・During playback of High Resolution files using a High Resolution Music App on an Android device the front panel indication will only show 44.1kHz.
    ・The front panel indicators are not compatible with all playback software for MAC and PC, so they may not indicate during playback depending on software . ADL recommends Foobar 2000.



  • USB Mini-B socket: For USB A output from a PC/MAC for music and to charge battery
  • USB A socket : For Android Device music output via OTG cable (USB A to micro-B type)
  • Optical and Analog out : Combined 3.5mm phone jack for Analog out and mini optical jack for optical output (24bit/192kHz Max.)
  • A second 3.5mm phone jack for headphone output (12~300 ohm range)
    (When using both 3.5mm headphone Analog out jacks simultaneously it is advisable to use near impedance headphones)
  • Optical Input: For digital signal from external device (24bit/192kHz Max.)
  • Line input : 3.5mm(4-pin) phone jack for analog input (switched/When headphones are plugged in there is no Android signal output)
  • Switchable between USB-A input (Android /Line in), Optical Input and USB-miniB (PC/MAC



  • Supports DSD64 (2.8MHz) and DSD128 (5.6MHz)
  • Digital inputs for Android, PCs, Optical (Optical out supports Android digital signal)
  • DD Converter (3.5mm TOSLINK optical output)
  • High-performance 24-bit/192kHz DAC chip
  • supports ASIO and Asynchronous mode
  • Low Jitter
  • Fits in the palm of your hand
  • Enjoy music anywhere, on your desk or on the go
  • Doesn’t draw power from connected Android Device battery



Top Panel LED Indicator:

• DSD Indicator: sample rates will indicate according to the computers sample rate signal 2.8M or 5.6M
• USB DAC (digital source - Mac or Windows USB connection): sample rates will indicate according to the computers sample rate settings ( 44.1/ 48/ 88.2/ 96/ 176.4/ 192kHz )
• Android Device digital connection: sample rates will indicate at 44.1kHz or 48kHz when connected with USB OTG cable
• Android Device analog connection: sample rates will indicate at 44.1kHz (When 3.5mm Line In jack is used Android digital signal input is deactivated)
• 3.5mm Optical input: If the playback sample rate cannot not be set at source, the 44.1kHz LED will indicate (Max. 24bit/192kHz sampling rates supported)
• Playback of computer based files using iTunes on either Mac or PC: sampling rates will indicate according to the computers sample rate settings (44.1/ 48/ 88.2/ 96/ 176.4/ 192kHz)

※Playback of computer based files using iTunes with Windows XP: sampling rates cannot be set, in this case the A1 will indicate at 44.1kHz