RME ADI-2 Pro FS
2x4 USB Audio Interface with SteadyClock FS
New Experience in Sound and Quality, Now with Femtosecond Clock Technology
This updated version of the ADI-2 Pro includes the same comprehensive functionality but now with femtosecond clock technology and AutoDark mode first implemented into the highly acclaimed ADI-2 DAC.
The ADI-2 Pro FS reference AD/DA converter is a host of devices all put together into one unit, with a simple and mostly automated way of using it right out of the box. A unit with the industry's biggest footprint per feature ratio, excellent tech specs, crystal clear and transparent sound signature, and two extremely powerful headphone outputs.
- A high-end AD/DA converter in professional studio quality
- A double headphone amplifier in true high-end quality
- A USB DAC like no other - the most versatile and capable one
- A high-end AD/DA front-end and headphone amp for iPad / iPhone
- A multi-format converter (AES, SPDIF, ADAT) with monitoring function
- A DSD record and playback solution
- An AD/DA front-end for audio measurement at up to 768 kHz sample rate
- SteadyClock FS - Femtosecond Clock Technology
- AutoDark Mode
- As the most flexible converter available, the ADI-2 Pro FS offers balanced/unbalanced analogue I/Os, double Extreme Power headphone outputs, SteadyClock FS, 4-stage hardware input and output level control, DSP-based signal processing, external power supply operation, Class Compliant USB compatibility, sample rates up to 768 kHz as well as DSD record and Direct DSD playback (256 / 11.2 MHz).
Analogue or Digital - Options Galore
The ADI-2 Pro FS includes two servo-balanced analogue inputs on combo XLR / TRS jacks, two separate balanced and unbalanced outputs on XLR and TS, two stereo Extreme Power headphone outputs on the front, an optical SPDIF I/O that also understands ADAT, and coaxial SPDIF (RCA) and AES I/O (XLR) via an included breakout cable. This universal set of I/O options offers superior quality and flexible connectivity to those who take a no-compromise approach to audio.
The USB 2.0 port is fully Class Compliant (UAC 2) for connection with compatible iOS devices, and is also used for firmware updates. Including an external switched power supply with lockable connector, the ADI-2 Pro FS can be easily powered from battery, opening up mobile applications as well as galvanically isolated use cases.
As a computer interface the ADI-2 Pro FS offers a stereo (2 in / 2 out) and a multichannel mode (6 in / 8 out). Compatibility with Mac OS X comes right out of the box. For Windows, the ADI-2 Pro uses RME's MADIface series driver, for full WDM and ASIO compatibility and highest performance.
Perfect Sound Capture and Reproduction
Aiming for the absolute reference sound, any detail in the ADI-2 Pro FS is special and has its own story. The main PCB is an extraordinary 10 layer design with custom copper thickness, guaranteeing finest undisturbed sound as well as ample but separated power for the phones outputs. Internal power supply stages and precise regulators use a super-low-noise design to not degrade performance through the power rails.
Selected SoundPlus operational amplifiers maintain highest SNR, lowest THD and high slew rate under all conditions. The whole analogue circuit design is fully symmetrical and balanced throughout - and DC-coupled. The only capacitors in the signal path perform DC protection at the analogue input sockets, and have been carefully selected to avoid any sonic impact.
The 4-channel AD-converter, supporting 786 kHz sample rate and DSD recording, is used in a dual mono design, with 3 dB improved signal to noise ratio. Two premium DACs are used for two separate stereo outputs. Internal audio processing like EQs, Crossfeed and spectral analysis, is done by a high performance DSP with 2.17 Giga FLOPS (2882 MIPS), delivering enough computing power to work even at 768 kHz sample rate.
For easy operation a high quality Sample Rate Converter has been added, switchable to the AES or SPDIF input, solving any clocking problem between those. And RME's latest SteadyClock III technology ensures perfect jitter reduction and stable clocking, no matter if internal or external clocks are used.
SteadyClock FS - Femtosecond Clock Technology
The ADI2 Pro FS is the second device in RME's range with SteadyClock FS. There is little to improve with SteadyClock, it has earned its accolades over years with flawless operation in numerous RME devices, guaranteeing that the internal clock will produce exactly the same sound as when using an external one.
SteadyClock assures high jitter rejection and is proven to handle all digital interface formats in an exemplary way.
With SteadyClock FS the focus is on reducing the self-jitter of SteadyClock to new lows, by improving its second, analogue PLL circuit, and referencing both Direct Digital Synthesis and PLL to a low phase noise quartz crystal.
The self-jitter measured through DA conversion now reaches levels that usually are only available in master quartz clock mode, while SteadyClock always runs in PLL mode – making sure that the sound is the same whether using internal or external clock.
The low phase noise oscillator driving the updated circuit reaches jitter specs lower than a picosecond (ps), and now you are in the area known as the FemtoSecond.
High Resolution Display Operation
RME have incorporated many unique features, not found on any comparable devices, like 5-band parametric EQs for fully individual phones compensation, adjustable Bass/Treble controls with quick access, a binaural crossfeed function, adjustable loudness filter, selectable AD/DA filters, four discrete I/O reference levels, auto reference level setting, auto balanced phones mode, and many more. The display is not only used to control the unit, but also shows warning and guidance messages.
Professional features such as M/S Processing, stereo width and phase reversal up to full control and storage of all settings are included, as well as RME's famous Spectral Analyzer, a 30-band bi-quad filtered analysis tool offering unprecedented musical visualisation, perfectly complementing the high-resolution IPS display.
Extreme Power Headphone Output
There is no use in boasting about -110 dB THD, when such values are not available in real world operation - for example when a 32 ohm headphone is connected. RME's engineers therefore designed a new headphone output stage that brings the full performance of the premium DAC to the phone jack - even when using low impedance headphones. The Extreme Power design excels with 0.1 Ohm output impedance, a maximum output level of +22 dBu, and a maximum output power of 1.5 Watts - per channel!
The RME ADI-2 Pro FS' two, fully separated stereo headphone outputs deliver the same 120 dBA SNR performance as the line outputs, for a full hum and noise free listening experience. THD is far below -100 dB (0.001%) even at full power, for the most clear and detailed soundstage possible. The Extreme Power design also incorporates current limiting, power surveillance, overload detection and DC protection. A low power mode and a high power mode are provided, for a perfect match from IEM up to planar.
Having two stereo outputs, balanced headphone operation is possible. As RME's engineers were not satisfied with the existing techniques they developed a new Advanced Balanced mode for the ADI-2 Pro FS, that removes most limitations of standard balanced operation, and turns this mode into a a fully new experience. The exclusive Advanced Balanced mode delivers a balanced signal path from the DAC straight to the phone, with 3 dB gain in Signal to Noise Ratio, smoothed out deviations in components, optimised frequency response, super low output impedance (0.2 Ohms), and a maximum output level of +28 (twenty eight) dBu.
When the AutoDark function is selected, the display, function keys and volume knob lights are automatically switched off after 10 seconds of the ADI-2 Pro FS being idle. The lights will come to life when you touch any button. This feature helps you with one less visual distraction when mixing or mastering.