headphone_amplifiers


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.)

IMPORTANT INFORAMTION FOR A1 and WINDOWS 10 USERS

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

* We have received reports of the A1 not being recognized by Windows PCs after recent Windows 10 Creators Update (Version 1703) and Windows 10 Anniversary Update (Version 1607). If you experience difficulties with A1 recognition on your updated PC, please reinstall the driver following this guide (download 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?

technical-specifications
  • 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


ADL-A1-CAUTION
  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.
Connectivity
  • 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

features
  • 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
    Front Controls and Indicators:
    ① Headphone and Analog out-1 (4-pin) : 3.5mm phone jack for headphones output
    ② 3.5mm Optical input jack: for SPDIF signal 24bit/192kHz Max.
    ③ Line input (4-pin): 3.5mm phone jack (switched) for analog source input (When 3.5mm Line In jack is used Android digital signal input is deactivated)
    ④Volume: Rotary-type variable resistor with power on/off
    ⑤ Charging Indicators: Three colors: RED, GREEN and ORANGE LED RED indicates charging/GREEN indicates full charge/ORANGE indicates low charge
    ⑥ Line input and Headphone out-1 (4-pin): ADL A1 Headphone Out supports 4pin 3.5mm headphones and earphones with remote and mic when the source is connected to the Line In jack with a 4pin 3.5mm stereo cable adl_x1
    Rear Panel:
    ⑦ USB Mini-B socket: For connection to Windows and MAC music sources via USB Cable and to charge battery (Internal DC3.7V 2600mAh Li-ion Type Rechargeable Battery)
    ⑧ USB A socket : For connection to Android Device music sources via a USB On-The-Go Cable (USB OTG cable is USB-A to micro-B type)
    ⑨ Headphone / Analog out-2 (3-pin) or 3.5mm Optical output: Combined 3.5mm phone jack or mini optical output jack for headphone or connection to external amplifiers via mini Optical cable (Optical out supports Android digital signal 16bit/48kHz Max.)
    x1-buttom

    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

    Bottom Panel:
    • Input Selection: Switchable between Android (USB-A input) /Line in, Optical Input and Windows/MAC (USB-miniB input)
    ※Switch must be reset after each selection, simply switch the ADL A1 on and off


Video


ADL A1 Q & A

Device/Computer does not recognize the A1

A1-1. Not connected correctly
(Refer to the A1 manual and check whether the A1 is connected correctly to portable player/Android device via the supplied 3.5mm the analog cable or the supplied OTG cable (USB-A to micro USB) or whether the A1 is connected correctly to the computer via USB Mini B cable)
A1-2. There is a problem with the cable.
(There may be a problem with the connected OTG cable, 3.5mm analog cable or USB cable. Please try with another cable)
A1-3. Android device is not recognized by the A1
(Refer to the A1 manual (Connectivity P.23) and reconnect the A1. If previously you had been using the A1 as a USB DAC, please try removing the cables and switching the A1 off and back on again. There is a possibility that the Android device is not compatible with the A1. Please refer to page 19 in the A1 user manual for the list of compatible Android devices.
A1-4. Computer does not recognize the A1
(In the case of Windows installation of a driver is necessary. The driver can be downloaded from the A1 webpage. If difficulties are experienced with the driver installed, please uninstall the driver and reinstall one more time) (In the case of MAC try disconnecting the A1 from the MAC and switching the A1 off and on again).
A1-5. Battery needs recharging
(Check whether the light next to the volume knob is on – Green: battery is charged – Red: battery needs charging – No light: battery needs charging)

Q2.No sound
Q3. There is no sound from computer speakers or computer headphone output
Q4. No sound from headphones
Q5. Unbalanced sound balance during playback
Q6. Sound cuts out
Q7. Experiencing noise
Q8. Is it possible to connect the A1 directly to an external stereo system?
Q9. Is a driver required?
Q10. Difficulties experienced trying to recharge the A1’s internal battery
Q11. Is it possible to use the A1 as a DDC between a MAC/PC and another DAC
Q12. Is it possible to use the A1 as a DDC between an Android device and another DAC
Q13. Is it possible to use the A1 for as a DDC for computer based DSD files?
Q14. Does the A1 up-sample or down-sample all Android based files to 16bit/48kHz?
Q15. Are there certain file formats that the A1 is not compatible with?
Q16. Is it possible to for the A1 to receive digital signal from iDevices (iPhone/iPod)
Q17. Is it possible to charge the A1 (using via USB miniB connection) while listening to Android based files.
Q18. Is it possible to take a phone call when using a headphone cable with a MIC?
Q19. Is it possible to take a phone call on an iphone when connected to the A1 via digital cable?
Q20. During playback with an Android device connected to the A1 via digital cable the Android volume can be adjusted. Does this mean it is analog signal?
Q21. During playback with an Android device connected to the A1 how should I adjust the volume?
Q22. Connected the A1 to a PC/MAC after listening with the A1 using an Android device and the PC/MAC does not recognize the A1.
Q23. How do you get the ASIO driver to be recognized by the computer?
Q24. I am using a MAC, shouldn’t it be ASIO compatible?
Q25. Are any special setting required for Asynchronous signal transfer?
Q26. In it possible to use a digital camera cable (USB A – micro B) to connect the A1 to an Android device?
Q27. After connecting a headphone cable with a mic/ remote control the sound comes from the Android
Q28. Experiencing intermittent noise
Q29. Is it possible to use the Integer Mode with Audirvana Plus to bypass Core Audio on MAC?
Q30. Could not play DSD files with iTunes.
Q31. Cannot playback DSD files on Windows
Q32. When the battery charge of the Android device runs low (10~20%), music playback stops.
Q33. When playback is initiated on the connected Android device or during playback, sound comes from the Android device and not the A1
Q34. The A1’s sample rate LEDs do not indicate when playing DSD files using and Android app.
Q35. Installed Windows Driver, but getting error message「Unrecoverable playback error: Could not query sample rate」 when using foobar2000 and cannot playback files
Q36. The connected USB Device Name is 「SPDIF interface」 in the ADL ASIO Driver
Q37. When playing back DSD files using JRMC software and A1 is selected as the ASIO Device, the sound is monaural. The A1’s indicator shows DSD 2.8M but JRMC playback is monaural.
Q38. Is the A1 compatible with Galaxy S6 and S6 Edge?
Q39. Is the A1 compatible with the latest versions of MAC OS
Q40. Is the A1 compatible with the Windows 10