1640

 

10. LOW EQ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+15

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This control gives you

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

up to 15 dB of boost or cut

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ONYX

+10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

at 80 Hz. The circuit is flat

+5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(no boost or cut) at the

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

–5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

center detent position.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

–10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This frequency represents

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

–15

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

the punch in bass drums,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20Hz

 

 

 

 

100Hz

 

 

 

 

 

 

1kHz

 

 

 

 

 

10kHz 20kHz bass guitar, fat synth

 

Low EQ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

patches, and some really

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GAIN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

serious male singers.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INOUT EQ

 

 

 

 

 

Note: Used in conjunction with the Low Cut

 

U

HIGH

 

 

 

 

 

 

 

 

12kHz

 

 

 

switch, you can boost the LOW EQ without

 

-15 +15

 

 

 

 

 

 

 

 

 

 

 

 

 

injecting tons of infrasonic debris into the mix.

 

2k

 

 

 

 

 

 

 

 

 

FREQ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

400 8k

UHIGH

 

MID

11. AUX Sends

-15

+15

 

 

400

 

 

FREQ

These six knobs tap a portion of each chan-

 

 

100

2k

nel’s signal out to either an effects processor or

 

MID

 

U LOW

 

-15

+15

for stage monitoring. The AUX Send levels are

 

ULOW controlled by the channel’s AUX 1-6 knobs, and

80Hz

by the AUX MASTER 1-6 knobs.

-15 +15

1These are more than just effects and monitor

AUX

sends. They can be used to generate separate

SEND

1mixes for recording, for another zone, or “mix-

OO

MAX

minuses” for broadcast or conference rooms.

13. MUTE

Engaging a channel’s MUTE switch provides (almost) the same results as turning the fader all the way down (a pre-aux send is not affected by the channel fader, but it is by the MUTE switch). Any channel assignments to MAIN MIX, SUB 1-2, or SUB 3-4 will be interrupted, all the AUX sends will be silenced (both pre- and post-fad- er), as will the AFL SOLO. The RECORDING OUT, channel INSERT, and PFL SOLO will continue to provide a signal when a channel is muted.

The LED next to the MUTE switch lights to let you know when the MUTE function is active.

14. Channel Fader

The fader controls the channel’s level…from off to unity gain at the “U” marking, on up to 10 dB of additional gain.

“U” Like Unity Gain
Mackie mixers have a “U” symbolon almost every level control. This

“U” stands for “unity gain,” meaning no change in signal level. Once you have adjusted the input signal to line-level, you can set

every control at “U” and your signals will travel through the mixer at optimal levels. What’s more, all the labels

2

OO

MAX

3

OO

MAX

4

OO

MAX

5

OO

MAX

6

OO

MAX

PAN

12. PAN

PAN adjusts the amount of channel signal sent to the left versus the right outputs.

With the PAN knob hard left, the signal feeds the MAIN LEFT, SUB 1, or SUB 3 buses, depending on the setting of the ASSIGN switches. With the knob hard right, the signal feeds the MAIN RIGHT, SUB 2, or SUB 4 buses.

on our level controls are measured in decibels (dB), so you’ll know what you’re doing level-wise if you choose to change a control’s settings.

15. Signal Level LEDs

These LEDs indicate the channel’s signal level after the GAIN control, INSERT jack, and EQ controls, but just prior to the channel’s fader. So even if the fader is turned down, you can see if a signal is present.

L R

1

MUTE

OL

+10

0

-20

SUB

ASSIGN

1-2

3-4

MAIN

MIX

SOLO

Constant Loudness: The
Onyx 1640’s PAN controlemploys a design called“Constant Loudness.” If you

have a channel panned hard left (or right) and then pan to the center, the signal is attenuated about 3

dB to maintain the same apparent loudness. Otherwise, it would make the sound appear much louder when panned center.

If you’ve followed the “Set the Levels” procedure, the

–20 and 0 LEDs should light frequently, the +10 LED should light occasionally, and the OL (Overload) LED should not light at all. If the OL LED is blinking fre- quently, the signal is probably distorted from overdriving the input. Either turn down the GAIN control or turn down the signal at its source.

16. ASSIGN Switches

Alongside each channel fader are three buttons referred to as channel assignment switches. Used in conjunction with the channel’s PAN knob, they are used to determine the destination of the channel’s signal.

With the PAN knob [12] at the center detent, the left and right sides receive equal signal levels (MAIN MIX L-R, SUB 1-2, and SUB 3-4). To feed only one side or the other, turn the PAN knob accordingly.

12

ONYX 1640