RR
RR
R
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EADEAD
EAD
M M
M M
M
EE
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D-75 / Sep 2004
AA
AA
A
udio Referudio Refer
udio Referudio Refer
udio Refer
ence Levelsence Levels
ence Levelsence Levels
ence Levels
All consoles are fully factory calibrated and will comply with the following
reference level:
-20dBFS digital = +4dBu analog = 0VU Note: 0dBu = .775v rms
+4dBu = 1.23v rms
These settings will provide a headroom of 20dB over the nominal input signal of
+4dBu analog, or -20dBFS digital. Should your facility require a different
A-D - D-A reference level please consult the factory for calibration details and/
or alternate solutions.
Note that due to the lack of level standards in the digital domain, headroom
available for digital sources will be entirely dependant on the source. In fact, CD's
are frequently made with less than 1dB of digital headroom, and any boosting of
digital CD levels in the console by moving the fader up above the nominal can
result in overload distortion for that channel. For this reason, a dipswitch allows
for digital attenuation on a fader by fader basis; digital sources can be conveniently
attenuated this way to guard against digital overload caused by not enough
headroom on the digital source. Since the D-75 console meters are true digital
reading meters, they will always show the console's digital levels, and whether
there are any "overs" in the signal. By pressing a channel's "CUE" button, the
switched meters will show the digital level of that channel's source, as modified
by the dipswitch setting. By using the program and watching these meters, the
amount of attenuation can be adjusted to meet your headroom requirements.
TT
TT
T
ypical Input Levelsypical Input Levels
ypical Input Levelsypical Input Levels
ypical Input Levels
Mic Inputs Nominal = -50dBm, 150Ω Maximum = -26dBm
Analog Inputs Nominal = +4dBu Maximum = +24dBu
Digital Inputs Nominal = -20dBFS Maximum = 0dBFS
II
II
I
MPORTANTMPORTANT
MPORTANTMPORTANT
MPORTANT
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