ADI 2/4 Pro EX

Professional AD/DA Conversion
Combines high-quality analog-to-digital and digital-to-analog conversion for studio, listening, and measurement applications.

Powerful Headphone Amplification
Two high-quality headphone outputs provide clean, transparent sound and ample headroom for a wide range of headphones.

Independent Headphone Outputs
Separate headphone paths make it easy to use or compare two pairs of headphones with individual listening levels.

Parametric Equalizer
Built-in EQ lets you precisely shape the sound for headphones, speakers, room correction, or personal preferences.

Independent Left and Right EQ
Sound adjustments can be applied separately to each channel for more precise listening and correction.

Bass and Treble Controls
Quickly adjust the tonal balance without having to configure the full equalizer.

Dynamic Loudness
Automatically adjusts bass and treble as listening volume changes to maintain a fuller, more balanced sound.

Headphone Crossfeed
Creates a more speaker-like listening experience by reducing the extreme stereo separation common with headphones.

Flexible Digital Connectivity
Supports multiple professional and consumer digital audio formats for easy integration with different audio equipment.

Sample Rate Conversion
Built-in conversion helps different digital devices work together smoothly even when their clocks or audio formats differ.

USB Audio Interface
Connects directly to computers and compatible mobile devices for high-quality recording and playback.

Automatic Operating Modes
The unit can automatically adapt its routing and operation based on the connected analog, digital, or USB source.

Advanced Audio Processing
Integrated processing provides EQ, loudness, crossfeed, channel control, signal routing, and other useful listening tools.

High-Resolution Display
The color display provides clear access to settings, signal levels, EQ curves, system status, and audio analysis.

Real-Time Audio Analyzer
A built-in spectrum analyzer gives a visual overview of the audio signal while listening or working.

Flexible Signal Monitoring
Analog and digital sources can be monitored and routed in multiple ways for studio, playback, and conversion workflows.

Balanced Headphone Mode
Supports balanced headphone operation for users who prefer compatible balanced headphone connections.

Remote Control
An included remote provides convenient access to volume, sound processing, source selection, and other commonly used functions.

Customizable Remote Functions
Programmable controls let frequently used functions and settings be accessed quickly from the listening position.

Software Remote Control
Compatible control software provides convenient access to device settings, EQ editing, presets, and configurations from a computer or mobile device.

Preset Storage
EQ configurations and complete device setups can be saved and recalled for different headphones, speakers, sources, or workflows.

Automatic Headphone Detection
The device recognizes headphone connections and intelligently manages output behavior for easier and safer operation.

Output Protection
Built-in protection helps safeguard connected headphones and equipment against problematic signals and operating conditions.

Advanced Clock Management
Integrated clock technology helps maintain stable, consistent conversion quality when working with different digital sources.

Studio and Home Integration
Flexible analog and digital routing allows the unit to function as a converter, headphone amplifier, preamp, USB DAC, or digital interface.

General Specifications
Device Type: 2-channel A/D converter, 4-channel D/A converter, USB audio interface
Enclosure: Half-rack 9.5", 1 U
Audio Resolution: 32-bit
Maximum Sample Rate: 768 kHz
Supported Sample Rates: 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384, 705.6, 768 kHz
USB Audio: USB 2.0 Class Compliant UAC 2
USB Stereo Mode: 2-channel I/O, up to 768 kHz
USB Multichannel Mode: 6-channel recording, 8-channel playback, up to 192 kHz
Conversion Formats: PCM, DXD, DSD
Clocking: SteadyClock FS
Sample Rate Converter: Asynchronous stereo SRC
SRC Conversion Ratio: Up to 1:7 or 7:1
SRC Maximum Sample Rate: 192 kHz
Internal DSP Performance: 2.17 GFLOPS
Display: High-resolution IPS

Analog Inputs
Channels: 2
Connector Type: XLR/TRS combo
Input Configuration: Servo-balanced
Maximum Input Level: +24 dBu
Reference Levels: +4 dBu, +13 dBu, +19 dBu, +24 dBu
Digital Trim Gain: 0 to +6 dB
Trim Gain Resolution: 0.5 dB
AD Filters: Short Delay Sharp, Short Delay Slow, Sharp, Slow
DC Filter Modes: Auto, ADC, RME, None
ADC DC Filter: 1 Hz high-pass
RME DC Filter: <0.1 Hz
Input EQ: 5-band parametric
Dual EQ: Independent left/right
Phase Invert: Off, Both, Left, Right
M/S Processing: Supported

Analog Line Outputs
Channels: 2
Balanced Output Connectors: 2 x XLR
Impedance-Balanced Output Connectors: 2 x 1/4" TRS
Reference Levels: +4 dBu, +13 dBu, +19 dBu, +24 dBu
Volume Range: -96 dB to +6 dB
Output Processing: Parametric EQ, Bass/Treble, Loudness, Crossfeed, Mono, Width, M/S processing
DA Filters: Short Delay Sharp, Short Delay Slow, Sharp, Slow, NOS, Short Delay Low Dispersion
Digital DC Protection: On, Off, Filter
Dim Level: -20 dB

Headphone Outputs
Stereo Outputs: 2
Connector Type: 1/4" TRS
Output Stages: 2 independent Extreme Power
Maximum Output Level: +22 dBu / 10 V
Standard Reference Level: +7 dBu
Hi-Power Reference Level: +22 dBu
Maximum Output Current: Approximately 260 mA per channel
Maximum Output Power: Approximately 1.5 W at 32 Ω
Output Impedance: 0.1 Ω
Signal-to-Noise Ratio: 120 dBA
THD at 32 Ω: Below -110 dB near full output
Frequency Response: 0 Hz to 80 kHz, -0.5 dB at 80 kHz
Balanced Headphone Operation: Supported
Dual Headphone Operation: Supported
Plug Detection: Supported

Digital Audio
AES I/O: Supported
SPDIF Coaxial I/O: Supported
SPDIF Optical I/O: Supported
ADAT Optical I/O: Supported
AES Maximum Sample Rate: 192 kHz
SPDIF Maximum Sample Rate: 192 kHz
ADAT Channels Accessible: Channels 1/2
ADAT SMUX: Supported
ADAT SMUX4: Supported
Optical Input Detection: Automatic SPDIF/ADAT
Optical Output Modes: SPDIF, ADAT
DSD over Digital Inputs: Supported
DSD Direct Mode: Supported
DSD Direct Filters: 50 kHz, 150 kHz

USB Connectivity
USB Interface: USB 2.0
Class Compliant Modes: Stereo, Multichannel
Stereo Mode