Mackie 1640 User Manual download pdf (Page 17)

Owner’s Manual

GAIN INSERTLOW CUT EQ

IN/OUT

MUTE

FADER

PAN

ASSIGN

MAIN MIX

SUB 1-2

SUB 3-4

AUX SEND 1 MASTER

MASTER SECTION

AUX SEND 1

AUX SEND 2

"POST" SIGNAL

"PRE" SIGNAL

AUX SEND 2 MASTER

INPUT

AUX SEND 2 PRE/POST SWITCH

AUX SEND 1 PRE/POST SWITCH

TO AUX SEND 1

OUTPUT

TO AUX SEND 2

OUTPUT

Auxiliary Section

This section includes the AUX MASTERS (Sends) and

the AUX RETURNS. These can be a bit confusing to the

uninitiated, so here’s the whole idea behind aux sends

and returns: sends are outputs and returns are inputs.

AUX SENDs tap signals off the channels, via the AUX

knobs [11], mix these signals together, then send them

out the AUX SEND jacks [62].

These outputs are fed to the inputs of an external

processor like a reverb or digital delay. From there,

the outputs of this external device are fed back to the

mixer’s AUX RETURN jacks [61]. Then these signals are

sent through the AUX RETURN level controls [38], and

ﬁ nally delivered to the MAIN MIX [46].

So, the original “dry” signals go from the channels to

the MAIN MIX and the affected “wet” signals go from

the AUX RETURNS to the MAIN MIX, and once mixed

together, the dry and wet signals combine to create a

glorious sound!

The AUX SENDS can also be used to provide another

mix for stage monitors, for example. In this case, the

AUX RETURNS aren’t used to return the signal. Instead,

they can be used as additional stereo inputs.

35. AUX 1 -6 MASTERS

The AUX MASTERS provide overall control over the

AUX SEND levels, just before they are delivered to the

AUX SEND outputs [62]. These knobs go from off (∞)

to +15 dB when turned all the way up.

This is usually the knob you turn up when the lead

singer glares at you, points at his stage monitor, and

sticks his thumb up in the air. (It would follow that if

the singer stuck his thumb down, you’d turn the knob

down, but that never happens.)

36. AUX PRE/POST

The PRE/POST switches determine whether the AUX

SEND signal is tapped from the channel before the fader

(pre-fader) or after the fader (post-fader). Typically,

you use a pre-fader send for monitors so you can control

the monitor levels independently from the MAIN MIX.

Use a post-fader send for effects, so that the “wet” signal

level follows the “dry” signal level.

Most other mixing consoles require you to assign the

pre/post function in pairs (Aux 1/2, Aux 3/4), which can

be very limiting if you want to provide three monitor

sends and one effects send, for example. The Onyx 1640

allows you to assign the pre/post function for each AUX

SEND individually!

Both pre- and post-fader sends are affected by the

MUTE button and the EQ controls (unless the EQ is

bypassed, of course).

Aux “Pre vs. Post”

Signal Flow Diagram

MON

MAIN

SUBS

CR/

PHONES

ONLY

SUBS

SEND

SUB ASSIGN

TO AUX 5

TO AUX 6

AUX

SENDS

AUX MASTERS

AUX

RETURNS

SOLO

PRE

POST

SOLO

PRE

POST

SOLO

PRE

POST

SOLO

PRE

POST

SOLO

PRE

POST

SOLO

PRE

POST

EFX

MON

+15

+10

+15

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 35 36

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Mackie 1640 User Manual Page 17

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