User's Guide Fireface 400
© RME
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22.2 Settings dialog – Input Gain
Mic 1/2
Channel 1/2 of the Fireface 400 have digitally controlled microphone preamps of the highest
quality. The digital control offers a gain setting in steps of 1 dB within a range of 10 dB to 65 dB.
The configuration is done either directly at the unit via the rotary encoder, or via the Settings
dialog. The current gain is displayed in dB left to the fader.
In the lower range the fader
jumps from 10 dB to 0 dB. This
useful additional setting allows
to operate even line signals with
the microphone input (up to +10
dBu).
Line 3/4
The inputs 3 and 4 also have a
digitally controlled preamp. It
allows for an additional gain
between 0 and 18 dB, in steps
of 0.5 dB. The configuration is
done either directly at the unit
via the rotary encoder, or via the Settings dialog. The current gain is displayed in dB left to the
fader. Further information is found in chapter 27.3.
Line 5-8
Defines the reference level for the rear analog inputs 5-8.
22.3 Settings dialog - DDS
Usually soundcards and audio interfaces generate their internal clock (master mode) by a
quartz. Therefore the internal clock can be set to 44.1 kHz or 48 kHz, but not to a value in be-
tween. SteadyClock, RME's sensational Low Jitter Clock System is based on a Direct Digital
Synthesizer (DDS). This superior circuitry can generate nearly any frequency with highest pre-
cision.
DDS has been implemented into the Fireface with regard to the needs of professional video
applications, as well as to maximum flexibility. The dialog DDS includes both a list of typical
video frequencies (so called pull up/pull down at 0.1% and 4%) and two faders, which allow to
freely change the basic sample rate in steps of 1 Hz (!).
The DDS dialog requires the Fireface to be in clock mode Master! The frequency setting will
only be applied this one specific Fireface!
Changing the sample rate in bigger steps during record/playback often results in a loss of
audio, or brings up warning messages of the audio software. Therefore the desired sample
rate should be set at least coarsely before starting the software.
Summary of Contents for Fireface 400
Page 5: ...User s Guide Fireface 400 RME 5 User s Guide Fireface 400 General ...
Page 12: ...12 User s Guide Fireface 400 RME ...
Page 13: ...User s Guide Fireface 400 RME 13 User s Guide Fireface 400 Installation and Operation Windows ...
Page 63: ...User s Guide Fireface 400 RME 63 ...
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Page 87: ...User s Guide Fireface 400 RME 87 User s Guide Fireface 400 Technical Reference ...
Page 99: ...User s Guide Fireface 400 RME 99 38 Diagrams 38 1 Block Diagram Fireface 400 ...
