RME Audio Digiface AES, Руководство пользователя

Страница: 38 / 104

38 User's Guide Digiface AES
© RME
19. Analog Inputs
The two balanced microphone inputs of the Digiface AES offer a digitally controlled gain of 75 dB,
adjustable in steps of 1 dB. The soft switching, hi-current Phantom power (48 Volt), switchable
per channel, provides a professional handling of condensor mics. Up to a level of
+18 dBu the
front XLR input can also be used as balanced and unbalanced Line input .
The TRS jacks of the two combo jacks are free of phantom power and fully compatible to unbal-
anced (mono jack) sources. They have a fixed level attenuation of 6 dB. The maximum input level
is the24 dBu, balanced and unbalanced.
Channels 5/6 feature an automatic overload protection.
AutoSet tries to keep a headroom of 6
dB. Levels higher than -6 dBFS will permanently reduce the gain. To check set the channels to a
high gain and apply an input signal. The button will quickly rotate back to a gain that is appropriate.
While with extreme overloads distortion will occur for the fraction of a second before the level is
set correctly, AutoSet works quite well in real-world applications and prevents distorted recordings
reliably.
Using stereo channels AutoSet operates ganged. AutoSet can be
activated in TM FX or directly at the unit in the channel settings.
As soon as AutoSet reduces the gain the label AS, shown in the
front display, changes its colour from black to blue.
20. Analog Outputs
20.1 Line / XLR
The short circuit protected, low impedance line outputs of channels 5/6 are available as male XLR
jacks on the back of the unit.
Two discrete hardware output levels are available, set in TotalMix Output Channel Settings, Level:
+19 dBu and +4 dBu, both @ 0 dBFS.
The electronic driver circuit of the XLR outputs does not operate servo-balanced! When con-
necting unbalanced equipment, make sure pin 3 of the XLR output is not connected. A con-
nection to ground will cause higher THD (distortion)!
20.2 Headphones / Line Out
Channels 7/8 of the Digiface are available on the front as 1/4" TRS jack. These channels use the
same converters as the Line outputs, therefore offer the same technical data.
Two hardware-based reference levels are available (set in TotalMix Output Channel Settings,
Level, High or Low). High 13 dBu @ 0 dBFS, Low +7 dBu @ 0 dBFS (6 dB lower output
level).
These outputs are low impedance types (5 Ohms), perfectly suited for headphone use.
Setting the output level, i.e. the monitoring volume, is done
– besides the pre-setting High/Low -
via TotalMix (Hardware Output, Phones) or directly at the unit via the encoder. Changing the
monitoring volume is therefore very easy and quickly done.
In case the Phones output should operate as line outputs, an adapter TRS plug to RCA phono
plugs, or TRS plug to TS plugs is required. See chapter 39.2 for details.
!