User Manual

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). A firmware update

added a fourth option, RS232, signaled by the LEDs OPTN and MIDI flashing alternately. Nev-

ertheless RS232 is currently not functional.

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!