Mackie ONYX 820i 26. MID EQ FREQUENCY (Ch. 1 and 2), 27. MID EQ LEVEL (Ch. 1 and 2), 25. HIGH EQ, 28. HIGH MID EQ LEVEL (Ch. 3 and 4), 29. LOW MID EQ LEVEL (Ch. 3 and 4)

7-8

1

2

3-4AUX SEND

AUX RETU

X

MIC

X

MIC

NYX MIC

BAL/UNBAL

1

BAL/UNBAL

NY

P

NY

P

P

R

O

R

O

R

O

E

E

E

8

9 INSERT

	1
	12
	2
INSERT	L
	(MONO)

13

L

(MONO)

R

26. MID EQ FREQUENCY (Ch. 1 and 2)

This knob sets the center frequency of the mid EQ level control [27]. This is sweepable from 100 Hz to 8 kHz.

Once this is set, the mid EQ level can be adjusted with the mid EQ level control.

10	LINE
	1
18	BAL/UNBAL
	LINE
	HI-Z
19 U 30	48V
	20
20	40

23U 60 GAIN

-20dB +40dB

SEND

24PRE

POST

UEQ

				LINE IN 5-6
				BAL/UNBAL
	2			R		L
	LINE					(MONO)
	BAL/UNBAL					BAL/UNBAL
	LINE		LINE	+4dB
	HI-Z			-10dB
	21					R
	48V			48V
30			30		U
20 U	40	20		40 MIC
	GAIN			GAIN		GAIN
U	60		U	60	+20dB
-20dB +40dB				-20dB
SEND			SEND	SEND
	PRE			PRE		PRE
	POST			POST		POST
U	EQ		U	EQ	U	EQ

LINE IN 7-8

L

(MONO)

BAL/UNBAL

R

U

GAIN

-20dB +20dB 22

SEND INPUT

LINE

UFW 1-2

Most of the root and lower harmonics that define a sound are located in the 100 Hz–8 kHz frequency range, and you can create drastic changes with these two knobs. Many engineers use mid EQ to cut midrange frequencies, not boost them. One popular trick is to set the mid fully up, turn the frequency knob until you find a point where it sounds just terrible, then back the mid down into the cut range, causing those terrible frequencies to disappear. Sounds silly, but it works. Sometimes.

25	HIGH
	12kHz
-15	+15
26	1k
	FREQ
100	8k
27	U
	MID
-15	+15
31	U
	LOW
	80Hz
-15	+15
	AUX

		HIGH				HIGH		HIGH
		12kHz				12kHz		12kHz
-15	+15		-15		+15		-15	+15
	1k		28	U
						HIGH
		FREQ				MID		U
						2.5KHz
100	8k		-15		+15	30		MID
	U			U
								2.5kHz
		MID				LOW	-15	+15
						MID
			29			400Hz
-15	+15		-15		+15
	U			U				U
		LOW				LOW		LOW
		80Hz				80Hz		80Hz
-15	+15		-15		+15		-15	+15
		AUX				AUX		AUX

HIGH

12kHz

-15 +15

U

MID

2.5kHz

-15 +15

U

LOW

80Hz

-15 +15

AUX

27. MID EQ LEVEL (Ch. 1 and 2)

The mid EQ provides up to 15 dB of boost or cut, and it is also flat (no boost or cut) at the detent. The frequency at which the cut or boost occurs is set by the mid EQ frequency control [26].

+15

+10

+5

0

–5

–10

–15

20Hz 100Hz 1kHz 10kHz 20kHz

	1
OO
32	MAX

2

	1		1		1
OO	MAX	OO	MAX	OO	MAX
	2		2		2

1

OO MAX

2

OO MAX OO MAX OO MAX OO MAX OO MAX

PAN		PAN	PAN	PAN	PAN
33
L R	L R	L R	L R	L	R

34MUTE	35
	OL
ALT 3-4	-20
U
36
OO +10dB
LEVEL
37SOLO	1

MUTE

OL

ALT 3-4

- 20

U

OO +10dB

LEVEL

SOLO

2

MUTE	MUTE
OL	OL
ALT 3-4	ALT 3-4
- 20	- 20
U	U

OO +10dB OO +10dB

LEVEL LEVEL

SOLO SOLO

3-4 5-6

MUTE

OL

ALT 3-4

- 20

U

OO +10dB

LEVEL

SOLO

25. HIGH EQ

The high EQ provides up to	+15
	+10
15 dB of boost or cut above
	+5
12 kHz, and it is also flat (no
	0
boost or cut) at the detent. Use	–5
it to add sizzle to cymbals, an	–10
	–15
overall sense of transparency,
	20Hz100Hz	1kHz	10kHz 20kHz

or an edge to keyboards, vocals, guitar and bacon frying. Turn it down a little to reduce sibilance or to mask tape hiss.

28. HIGH MID EQ LEVEL (Ch. 3 and 4)

The high mid EQ provides up to 15 dB of boost or cut at 2.5 kHz, and it is flat at the detent.

29. LOW MID EQ LEVEL (Ch. 3 and 4)

The low mid EQ provides up to 15 dB of boost or cut at 400 Hz, and is flat at the detent.

30. MID EQ LEVEL (Ch. 5/6 and 7/8)

The mid EQ provides up to 15 dB of boost or cut at 2.5 kHz, and is flat at the detent.

31. LOW EQ

The low EQ provides up to	+15
	+10
15 dB of boost or cut below
	+5
80 Hz. The circuit is flat at the
	0
center detent position. This	–5
frequency represents the punch	–10
	–15
in bass drums, bass guitar, fat
	20Hz	100Hz	1kHz	10kHz 20kHz

synth patches, and some really serious male singers who eat raw beef for breakfast.

20Onyx 820i