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User’s Guide ADI-2/4 Pro SE - v 1.0
4. Brief Description and Characteristics
The ADI-2/4 Pro SE is a 2-channel analog input to digital and 4-channel digital to analog output
converter in a half-rack (9.5") enclosure of 1 U height. Latest 32 bit / 768 kHz converters offer up
to 123 dBA signal to noise ratio. This value is not only printed in the brochure
– it is what the unit
achieves in real-world operation.
Reference class tech specs throughout are combined with an unprecedented feature set. A pow-
erful DSP adds all kinds of useful audio processing, including 5-band parametric EQ, fast
Bass/Treble adjustment, Crossfeed, and a new concept in Loudness sound control.
Operation is quick and easy through 3 encoders with push button function and 4 more buttons to
access dedicated menus. The unit remembers all current settings, even the menu position. Addi-
tionally the unit’s whole setup as well as equalizer settings can be stored under individual names.
A high resolution IPS panel for the graphical operation surface eases operation even more, and
displays further functions provided by the DSP, namely Peak level meters, a 30-band analyzer in
DIGICheck biquad filter technology, and a State Overview screen listing the current states of
SPDIF, AES, USB and clock.
The digital inputs SPDIF coaxial (or optical) and AES operate simultaneously. An additional Sam-
ple Rate Converter decouples the SPDIF or AES clock for even simpler setups, and also supports
up- and down-sampling of the input signals. SPDIF optical also supports 2 channels of ADAT
operation, at up to 192 kHz.
When used as USB interface, the Class Compliant UAC 2 mode can be set to Stereo or Multi-
channel. Multi-channel mode turns the ADI-2/4 Pro SE into a 6 channel (Analog 1/2, AES, SPDIF)
record and 8 channel (Analog 1/2/3/4, AES, SPDIF) playback audio interface, that even works as
iPad front-end up at up to 192 kHz sample rate. In stereo mode sample rates up to 768 kHz are
supported, for high resolution recordings or PCM, DXD and DSD record/playback.
The servo balanced analog inputs and dedicated balanced and unbalanced outputs are fitted with
both XLR and 1/4" TRS jacks. The unit uses a fully balanced and DC-coupled circuit design, for
highest phase accuracy at lowest roll-off. The only capacitors in the whole signal path, non-polar
MUSE audio capacitors from Nichicon, reside directly at the input of the unit (external DC protec-
tion).
The two Extreme Power headphone outputs provide reference sound and headroom
. RME’s True
Balanced mode, one more of an endless feature list, realizes balanced phones operation inde-
pendent from the XLR outputs.
To maintain the full dynamic range within the best operating level, discrete 5-stage reference level
settings were realized for maximum dynamic range (+1, +7, +13, +19, +24 dBu). Also available
are 0 to +6 dB digital trim for fine input sensitivity adjustment in steps of 0.5 dB.
The ADI-2/4 Pro SE supports sample rates between 44.1 kHz and 768 kHz. Furthermore, RME's
SteadyClock FS guarantees exceptional performance in all clock modes. Thanks to a highly effi-
cient jitter suppression, the AD- and DA-conversion always operates on highest sonic level, being
completely independent from the quality of the incoming clock signal.
The ADI-2/4 Pro SE shines in both studio and home usage. Its click- and noise-free on/off oper-
ation and a comfortable, illuminated standby button add to the soft, modern desktop design.
Mobile and galvanically separated usage is possible through a 12V connector for easy battery
connection.
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