3.4.1 Features
There are three microphone channels. The
“Phan-
tom 48V”
is common for the three channels; that is
to say, the phantom enables/disables simultaneously
for the three channels. Remember that all dynamic
microphones can connect to a line with phantom vol-
tage, without risk of damage; because internally they
have a transformer that disconnects the DC. So it is
possible to
mix dynamic and condenser
micropho-
nes.
Channel
MIC-3
shares an auxiliary input line (unba-
lanced). Being a MIC & Line channel, it has some
special features:
•
MIC-3
can be assigned directly to recor-
ding
(note that MIC-1 and MIC-2 only can be
sent to REC through EQ).
•
MIC-3
does not activate the tally
light nor
mute the Studio monitors. If you need to use
only one microphone, please considers that
will have to use MIC-1 or MIC-2, never MIC-3.
•
Unlike the main line channels, LIN-3
cannot
be assigned simultaneously to PGM and
REC
. If you press both buttons PGM and
REC, the audio is sent only to program.
•
LIN-3
can be routed to EQ. But only in mono
mode
All the channels have a
gain knob
. It must adjust so
that the main fader works over the overload
“OVL”
indication (- 30 dB). Remember that in all audio con-
soles, excessive input gain reduces the dynamic ran-
ge
.
If you work with the main fader below this level,
the signal from the previous stage must be very high
and the peaks will be clipped.
3.4.2 Processing
Each MIC channel can be sent directly to the air
(PGM) or the processing stage (EQ + compressor).
As well, the processed signal can be sent to the air
or to recording out.
Equalizer:
The equalization settings are the same for all
assigned channels. The figure shows the equalization
curves. These curves are designed to improve the quality
of the human voice. The ends of the spectrum work in
shelving way, with 15 dB action.
As reference we
said that the LOW
(or bass) control of-
fers “body” and
“weight” to the voi-
ces; whereas the
HIGH one adds
“presence” and usu-
ally improves the in-
telligibility. The cen-
tral frequencies have
a bell-shaped curve
(peak EQ). Mid-bass
is centered in 160
Hertz, where usually
the plopping effect
are concentrated, or
there is excessive
resonance in certain
masculine voices.
The mid-high band
is located at 5 KHz,
because around this
frequency usually
appear the problems
with the “sss” (ex-
cessive emphasis
the sibilants sounds,
like “shhh”)
Compression
The compressor
maintains constant
the peak level of the
human voice. It
starts to work when
the signal surpasses
the 0 VU level. Be-
low that level the dynamic range is not affected. D-816
has a very steep compression slope and fast attack and
recovery times
.
Indicator “MIC COMPRESSOR” shows in dB the
reducti-
on
applied
to
the signal.
Page 22
D·816
broadcast console
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