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ADL A1 DAC & Headphone Amp

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Small, Descrete, and Very Capable

ADL – Alpha Design Labs – creates innovative, smart-looking components for computer-based systems as well as personal and portable electronics. Tokyo-based ADL by Furutech™ aims high using the best materials and innovative design for an expanding line of Japanese-designed precision products including the superb sounding 24/192 ADL X1 Headphone Amp.

Headphone listening is an intimate sonic experience and most enthusiasts employ headphone amplifiers and a good pair of headphones much like ADL H118. Headphone amplifiers determine the quality of sound in hand with the headphones so both must be technically capable and offer fine sound as well.

The X1 is small, discrete but highly specified with inputs supporting iOS digital at up to 16/48 via APPLE MFI certified USB cable for iPod, iPhone and iPad devices. The X1 also runs 24/192 SPDIF with high resolution files from MAC and PC via USB output. There’s an analog line-level 4-pin 3.5mm input and a 4-pin 3.5mm output for headphones in the 12~600 ohm range. The 4-pin input supports 3.5mm Remote and Mic Earphones. The 3.5mm TOSLINK optical output delivers SPDIF up to 24/192. There’s a convenient GND TRRS switch making it easy to change from one 4-pin set of ‘phones to another. No drivers are needed with Mac computers while a single standard driver is available for Windows computers.
  • 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 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
  • Technical:
  • 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.
  • Inputs and Indicators:
  • Headphone and Analog out-1 (4-pin) : 3.5mm phone jack for headphones output
  • 3.5mm Optical input jack: for SPDIF signal 24bit/192kHz Max.
  • 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)
  • Volume: Rotary-type variable resistor with power on/off
  • Charging Indicators: Three colors: RED, GREEN and ORANGE LED RED indicates charging/GREEN indicates full charge/ORANGE indicates low charge
  • 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:
  • 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)
  • 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)
  • 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.)
  • 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
  • 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
  • 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)
  • Compatible Android Devices (2013-15):
  • Sony: Xperia Z3 / Xperia Z3 Compact, Xperia Z , Xperia Z1 , Z1 Compact ( Xperia Z1f ) , Xperia A (Xperia ZR) , Xperia Tablet Z , Xperia V
  • Samsung: GALAXY Note3 , GALAXY Note II , GALAXY S4 , GALAXY S3 , GALAXY S5 , GALAXY S3 mini , GALAXY S5 mini , (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, HTC (Android kitkat 4.4.X) --- HTC One M8
  • SInFocus:IN810
  • Things to consider...
  • 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.
  • A1 supports 16bit/176kHz, but does not support 24bit/176kHz
  • A1 does not support digital signal from iDevices
  • A1 does not support HTC Android 4.3
  • A1 does not support SPDIF out from DSD playback
  • At low A1 battery charge the Android signal may disconnect
  • Adjust the Foobar output function Buffer length to 1030ms to ensure smooth playback.
  • 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.
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