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ADL A1 - Portable Headphone Amplifier and Android Compatible DAC The ADL A1 is a high-resolution portable headphone amplifier and DAC designed for audiophiles on the move. Compatible with Android devices, Mac, and PC, it delivers exceptional sound quality with support for DSD audio and multiple sampling rates. Key Features High-performance CIRRUS LOGIC CS4392K 24-bit/192kHz DAC chip supporting PCM and DSD audio Supports DSD64 (2.8MHz) and DSD128 (5.6MHz) playback USB 2.0 High-Speed compliant VIA VT1736 32-bit/192kHz USB chip with ASIO and Asynchronous mode Texas Instruments TPA6130A2 high-fidelity headphone amplifier with 98 dB SNR Multiple inputs: USB Mini-B (PC/Mac), USB A (Android via OTG cable), optical and line inputs Switchable input selection between USB-A, USB Mini-B and optical inputs Long battery life: up to 7.5 hours playback, rechargeable in 5 to 5.5 hours Compact and lightweight design (68 x 118 x 16.5 mm, 150g) Does not draw power from connected Android device battery Front panel LED indicators for sampling rates and charging status Specifications DAC Chip: CIRRUS LOGIC CS4392K 24bit/192kHz USB Chip: VIA VT1736 32bit/192kHz, USB 2.0 High Speed compliant Headphone Amplifier: Texas Instruments TPA6130A2, SNR 98 dB Operational Amplifier: TI LME49726, low distortion, rail-to-rail output Max Headphone Output Levels (1% THD, 1kHz): 70mW (12 ohm), 80mW (16 ohm), 65mW (32 ohm), 38mW (56 ohm), 9mW (300 ohm) Battery: Internal DC 3.7V 2600mAh Li-ion rechargeable Charge Time: approx. 7 hours via USB bus power (DC 5V, 0.5A), 5–5.5 hours via AC/DC adaptor (5V, 1.0–2.0A) Playback Time: up to 7.5 hours when fully charged Dimensions: 68(W) x 118(D) x 16.5(H) mm Weight: approx. 150g Compatibility The ADL A1 supports a wide range of Android devices (as of 2015), including: Sony: Xperia Z5, Z4, Z3, Z3 Compact, Z1, Z1 Compact (Z1f), Xperia A (ZR), Xperia Tablet Z, Xperia V Samsung: Galaxy Active Neo, Note Edge, Note 3, Note II, S3, S4, S5, S3 Mini, S5 Mini, S6, S6 Edge (Note: S3 Mini and S4 Mini not supported) HTC: J Butterfly, J One Butterfly, New One, One (M7) [Android 4.2], One (M8), One X [Android 4.3], One M8 [KitKat 4.4.x] (Note: One (M7) running v4.3 or v4.4.2 not supported, HTC Android 4.3 not supported) InFocus: IN810 Important Notes & Usage Tips Recommended PC specs for DSD playback: Dual-core CPU 2.0 GHz or above, 2GB RAM or higher Ensure the ADL A1 ASIO icon appears on your desktop to confirm successful driver installation Adjust ASIO buffer size to maximum for smooth playback Supports 16-bit/176kHz but not 24-bit/176kHz playback Does not support digital signal from iDevices Does not support SPDIF output during DSD playback Low battery on the A1 may cause Android digital signal disconnection Adjust Foobar2000 output buffer length to 1030ms for stable playback Playback may stop when Android device battery is low (10–20%) due to device restrictions If sound plays from the Android device instead of the A1, check that the A1 battery is sufficiently charged Front panel sampling rate indicators may show 44.1kHz during high-resolution playback on Android devices due to software limitations ADL recommends using Foobar2000 for optimal compatibility on Mac and PC Front Controls and Indicators Headphone and Analog Out-1 (4-pin): 3.5mm jack for headphones output 3.5mm Optical Input Jack: Supports SPDIF signal up to 24bit/192kHz Line Input (4-pin): 3.5mm jack for analog source input (disables Android digital input when used) Volume Control: Rotary variable resistor with power on/off Charging Indicators: RED (charging), GREEN (fully charged), ORANGE (low charge) Supports 4-pin 3.5mm headphones/earphones with remote and mic when connected via line-in Rear Panel USB Mini-B Socket: Connects to Windows/Mac for music playback and battery charging USB A Socket: Connects to Android devices via USB OTG cable (USB-A to micro-B) Headphone/Analog Out-2 (3-pin) or 3.5mm Optical Output: Combined jack for headphones or external amplifier connection (optical supports Android digital signal up to 16bit/48kHz) Top Panel LED Indicators DSD Indicator: Shows sample rates of 2.8M or 5.6M USB DAC (Mac/Windows): Displays sample rates from 44.1kHz up to 192kHz Android Digital Connection: Indicates 44.1kHz or 48kHz when connected via USB OTG Android Analog Connection: Indicates 44.1kHz (digital input disabled when line-in used) 3.5mm Optical Input: Defaults to 44.1kHz if source sample rate cannot be set (supports max 24bit/192kHz) Playback via iTunes (Mac/PC): Shows sample rate according to computer settings (except Windows XP, which defaults to 44.1kHz) Bottom Panel Input selection switch toggles between Android (USB-A), Line In, Optical Input, and Windows/Mac (USB Mini-B). The device must be powered off and on again after switching inputs.