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ADL X1 - USB DAC Headphone Amplifier for iPhone, iPod and iPad The ADL X1 is a compact, high-performance USB DAC headphone amplifier designed for audiophiles seeking superior sound quality from their iOS devices and PCs. It supports high-resolution audio playback up to 24-bit/192kHz, delivering crystal-clear sound for headphones ranging from 12 to 600 ohms. Key Features High-performance 24-bit/192kHz XMOS USB and ESS-ES9023 DAC chip Supports Apple MFi certified USB connection for iPhone, iPod, and iPad (up to 16/48kHz) Supports 24/192kHz SPDIF input from PC via USB Mini-B Gold-plated 3.5mm analog line input and headphone outputs 3.5mm TOSLINK optical output for digital audio up to 24/192kHz GND TRRS switch for compatibility with different 4-pin headphone types (Sony or Apple) Rechargeable 2600mAh Li-ion battery with up to 7.5 hours playback time Does not draw power from connected iDevice battery Compact and elegant aluminium and ABS plastic casing Supports ASIO and asynchronous USB modes for low jitter audio Compatible with a wide range of Apple devices including iPhone 3GS to iPhone 5, iPod touch 3rd to 5th Gen, iPod nano 5th to 7th Gen, iPod classic 160GB (2009), iPad mini, iPad 2 and 3rd Gen Specifications Max headphone output at 1% THD @ 1kHz: 34mW (12Ω), 60mW (16Ω), 82mW (32Ω), 86mW (56Ω), 36mW (300Ω), 19mW (600Ω) Channel separation: 60–64dB (1kHz, 33Ω), -50dB (±3dB) Frequency response: 20Hz–20kHz (±0.5dB) Total Harmonic Distortion: 0.033% (33Ω), Signal-to-noise ratio: 95.5dB (32Ω), 98.1dB (56Ω), 101.6dB (300Ω), 102.1dB (600Ω) Charge time: approx. 4–5 hours (AC/DC 5V, 1.0–2.0A adapter, sold separately) Charge time: approx. 7 hours (DC 5V 0.5A USB bus power) Playback time: up to 7.5 hours when fully charged Dimensions: 68mm (W) x 118mm (D) x 16.5mm (H) Weight: approx. 147g USB 2.0 High Speed (480Mbit/s) compliant supporting sampling rates: 8/16/32/44.1/48/88.2/96/176.4/192kHz Power supplies: DC 5V 500mA–2000mA and internal 3.7V 2600mAh Li-ion rechargeable battery Uses Maxim MAX9724C low-RF direct-drive stereo headphone amplifier and TI LMV832 dual 3.3 MHz EMI-hardened low-power CMOS OP AMP Compatibility iPhone 5 (Lightning cable), iPhone 4S, iPhone 4, iPhone 3GS iPod touch 5th Gen (Lightning cable), 4th Gen, 3rd Gen iPod nano 7th Gen (Lightning cable), 6th Gen, 5th Gen iPod classic 160GB (2009) iPad mini, iPad 2, iPad 3rd Gen Controls and Indicators Front volume control: rotary variable resistor with power on/off switch Charging LED indicators: RED (charging), GREEN (fully charged), ORANGE (low charge) GND TRRS switch to match different 4-pin headphone types (Sony or Apple) 3.5mm headphone and analog output connectors (4-pin and 3-pin) Line input: gold-plated 3.5mm analog input (switched) Panel Connections Rear Panel USB A socket: Apple MFi certified USB cable connection for iDevices USB Mini-B socket: USB connection for PC music playback and battery charging Internal 3.7V 2600mAh Li-ion rechargeable battery Headphone and analog output 2 (3-pin): combined 3.5mm phone jack and mini optical output jack Top Panel LED Indicator Indicates sampling rates based on source and connection type: SB DAC (digital source via PC USB): sampling rates indicated according to computer settings (44.1/48/88.2/96/176.4/192kHz) USB DAC (analog source via 3.5mm line-in): sampling rate indicated at 48kHz iDevice digital connection: LED flashes at 44.1kHz when connected with Apple MFi approved USB cable iDevice analog connection: LED on at 44.1kHz Playback via iTunes on Mac or PC: sampling rates indicated according to computer settings Playback via iTunes on Windows XP: sampling rate fixed at 44.1kHz Bottom Panel Input selection switch between USB A socket (iOS devices) and USB Mini-B socket (PC). Switch must be reset by powering the ADL X1 off and on after each change.