Behringer Eurodesk SX4882 User Manual

EURODESK SX4882

Input/output channel

Main equalizer

3.4

Main equalizer

Fig. 3.3:

The main equalizer can be switched (S10) out of circuit for easy

A/B 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 (P4 and P9). These are DUPLICATED for the

B-channel (P18 and P19), not merely “SPLIT” off from the main

EQ. I.e. you can have a full 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

(P5, P6, P7 and P8). No experienced engineer will complain about

that! All four bands offer 15 dB of cut and boost.
Thirdly, there is a steep high pass (low cut) filter (S11), slope @

12 dB/octave, -3 dB @ 75 Hz, for reducing floor rumble, plosives,

woolly bottom end, etc.

Aux sends

3.5

All six aux sends are mono and post EQ. They are switchable

PRE/POST fader in two banks (S13 and S16). For aux sends 1

and 2, two dedicated pots (P12 and P13) are used. These can be

taken from a point before or after the channel fader, i.e. PRE or

POST (S13). Aux sends 3 and 4, and 5 and 6 are serviced by two

potentiometers (P14 and P15). The SHIFT button (S15) 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 (S17), and, as before, can be pre or post (S16).

Aux sends

Fig. 3.4:

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 (S13 and S16).

Most reverbs etc. sum up the left and right inputs in-

ternally. 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.

Routing and muting

3.6

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

S32 (see figure 3.5), while the subgroups are selected by switches

S28 (for groups 1 and 2), S29 (3 and 4), S30 (5 and 6) and S31

(7 and 8). Odd and even numbered groups are selected via the

main A-channel PAN P24, as are the left and right mix buses.

(The sixth stereo bus is the MIX-B bus, with it’s own independent

pan control P20; see section 3.7 “B-channel”). Usually, only one

of S28 to S31 will be selected for a particular channel (See block

schematics).

An exception to this rule is when laying down voice

takes. It is often convenient to have the mic channel(s)

routed to alt potential TAKE tracks simultaneously, since

you are often dropping in quickly between four or more

tracks. It means one less button press each time you

switch tracks.