Input Gain Setting; Main Equalizer; Routing And Muting - Behringer EURODESK SX4882 User Manual

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EURODESK SX4882 User Manual
3.3

Input gain setting

The channel input level is set by the TRIMPOT (
to bring the channel's input onto the L/R bargraph meters under the master
section of the EURODESK SX4882. This also sends the SOLO/PFLed signal to the
left and right speakers. Channel PFL/SOLO (
(See also 13.1 "A-channel setting up procedure" and 6.5 "PFL/SOLO".)
◊
For level-setting (as opposed to localized listening) choose to use the
mono PFL rather than the post fader SOLO bus (
◊
SOLO/PFL never interrupts the mix at the main recording outputs.
It follows that aux sends and subgroups must also be unaffected,
since they can contribute directly to the main mix.
In addition to switchable PFL/SOLO metering, a couple of LEDs (
continuously monitor whether a signal is present (-20 dB) or the channel is
going into overload (PEAK). These take their cue from three test points: input,
post EQ and post fader. In all cases the higher level wins. You do NOT want the
overload light to come on, or if it does no more than very intermittently during
a take or a mix.
3.4

Main equalizer

Fig. 3.3: Main equalizer
The main equalizer can be switched (
comparisons between EQed and straight signals, or when you know that you don't
want to use desk EQ at all. It is best considered in three sections. First, there are
two Baxendall shelving frequency controls for treble and bass, at 12 kHz and 80 Hz
respectively ( and ). These are DUPLICATED for the B-channel (
P 4 P 9
and ), not merely "SPLIT" off from the main EQ. I.e. you can have a full
P 19
4-band EQ on the main channel AND a 2-band EQ on B-channel.
Secondly, there are two semi-parametric swept mids, Q fixed at 1, which cover
the bands 300 Hz to 20 kHz and 50 Hz to 3 kHz. An unusually broad frequency
range is catered for, and there is an enormous 3-plus octave overlap between the
two mid bands ( , ,
P 5 P 6 P 7
complain about that! All four bands offer 15 dB of cut and boost.
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). Use SOLO/PFL (
P 2 S 26
) has an associated LED (
S 26
S 95 DOWN).
and
L 24
) out of circuit for easy A/B
S 10
and ). No experienced engineer will
P 8
Thirdly, there is a steep high pass (low cut) filter (
-3 dB @ 75 Hz, for reducing floor rumble, plosives, woolly bottom end, etc.
)
3.5 Aux sends
). All six aux sends are mono and post EQ. They are switchable PRE/POST fader in
L 26
two banks ( and
S 13
( and ) are used. These can be taken from a point before or after the
P 12 P 13
channel fader, i.e. PRE or POST (
serviced by two potentiometers (
determines whether buses 3 and 4 or 5 and 6 are addressed. Also, these four
sends can be derived from the main mix or MIX-B, depending on SOURCE (
and, as before, can be pre or post (
)
L 25
Fig. 3.4: Aux sends
◊
For almost all FX SEND purposes, you will want auxes to be post
fader, so that when a fader level is adjusted, any reverb send from
that channel follows the fader. Otherwise, when the fader is pulled
down, the reverb from that channel would still be audible. For CUEing
purposes, aux sends will usually be set pre fader, i.e. independent of
the channel fader (
◊
Most reverbs etc. sum up the left and right inputs internally. The very
few that don't may be driven in true stereo either by 1) 2 aux sends or 2)
the MIX-B bus (see section 3.7 "B-channel").
◊
There is +15 dB of gain on every aux send. Such a high boost is only
appropriate where the channel fader is set around -15 dB or lower.
Here, an almost exclusively WET signal will be heard. Previously, in most
consoles, such a wet mix required the use of a PRE setting for the
channel auxiliary send. This meant losing fader control over the signal.
3.6

Routing and muting

P 18
ROUTING means selecting which BUS you want a channel to address. There are
actually six stereo buses in the EURODESK SX4882 (plus a stereo SOLO bus).
The main mix bus is selected by
are selected by switches
(5 and 6) and (7 and 8). Odd and even numbered groups are selected via
S 31
the main A-channel PAN
stereo bus is the MIX-B bus, with it's own independent pan control
see section 3.7 "B-channel"). Usually, only one of
for a particular channel (See block schematics).
), slope @ 12 dB/octave,
S 11
). For aux sends 1 and 2, two dedicated pots
S 16
). Aux sends 3 and 4, and 5 and 6 are
S 13
and ). The SHIFT button (
P 14 P 15
).
S 16
S 13 and S 16 ).
(see figure 3.5), while the subgroups
S 32
(for groups 1 and 2),
S 28 S 29
, as are the left and right mix buses. (The sixth
P 24
to
S 28
)
S 15
),
S 17
(3 and 4),
S 30
;
P 20
will be selected
S 31