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17.2 Preamp
Preamp: Analog in to Analog out (internal digital routing).
This mode can be activated manually by selecting Basic Mode – Preamp. The device enters
Preamp mode automatically when Basic Mode is set to Auto and no digital input signal and no
USB is detected.
Analog input signals are automatically routed to the analog outputs. Use an analog source to hear
it via the rear analog outputs or the headphone outputs, amplified, EQ'd, processed, level shifted
and impedance or unbalanced/balanced converted.
Default sample rate in this mode is 192 kHz, which represents the optimum in fully available DSP
power and superior sonic transparency. Changing the sample rate manually is possible and the
new value will be remembered.
The below diagram shows that the analog input is sent to all digital outputs simultaneously. Any
DSP setting (EQ, phase etc.) of the analog input will affect all outputs. Furthermore the processed
input signal is then processed independent for both analog outputs once more with the respective
output settings.
Note: To simplify the diagram and to maintain overview USB record is not shown. In all modes all
input signals are sent over USB to the host. In multi-channel mode three separate stereo pairs,
in stereo mode only the stereo analog input.
USB Playback channels 3/4 can only be monitored in multi-channel mode. In stereo mode select-
ing USB 3/4 plays channels 1/2.
The option Digital Out Source – Main Out (SETUP – Options – Device Mode / DSD) sends the
processed signal Line Out 1/2 to the digital outputs AES, SPDIF and ADAT, for example to con-
nect active monitors having digital inputs.
User's Guide ADI-2/4 Pro SE - v 1.0
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