RME Audio DMC-842, User Manual

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User’s Guide DMC-842
© RME
8.4 Remote
REMOTE defines the source of MIDI remote control commands. Choices are the MIDI DIN jack,
the D-sub AES1 and the MADI input of the I64 MADI Card (Option Slot).
Note: Via MIDI remote control, all front panel controls can be locked (Lock Keys). An exception
is the REMOTE key. In Off-state Lock Keys is deactivated. Therefore a locking of all the
controls can be revoked directly at the unit at any time.
9. The Input Channel in Detail
9.1 General
Each channel has a dedicated configuration area on the front plate. The display
GAIN shows
the currently set amount of amplification. The 13-segment LEVEL meter with switchable Peak
Hold function shows the digital signal level after Gain control, but before SRC, stereo and M/S
processing, as shown in the block diagram (chapter 20). The
SELECT button is used to select a
channel, but also to activate/deactivate the different functions (DPP, STEREO etc).
9.2 Gain
The DMC-842's
GAIN can be set individually per channel over a range of 0 db up to +63 dB, in
steps of 1 dB. The device has its own gain control, operational even in the asynchronous Mode
1, and – as shown in the block diagram – is placed in front of the SRCs. When the microphone
signals support for gain control, the DMC-842’s gain stage is deactivated automatically by set-
ting it to 0 dB internally.
The gain can not be set directly for inactive channels. Therefore in Stereo mode the gain dis-
play of the right channel is turned off.
9.3 Digital Phantom Power
The LED
DPP indicates activated digital phantom power for the XLR input. Phantom power
should only be activated when using digital microphones.
Connecting and disconnecting microphones while phantom power is active causes a volt-
age surge, which can destroy components. Switch phantom power off before connect-
ing/disconnecting any external device.
As called for in the AES42 standard, the DMC-842 provides a common mode voltage of 10
Volts on both input pins. When connecting fully balanced AES/EBU outputs, this voltage theo-
retically stays without effect. Nevertheless we strongly recommend to switch off DPP in such
cases. When connecting unbalanced outputs (AES-ID or SPDIF) a current is expected to flow
through the output stage of the feeding device!