Mackie 1220 Owner's Manual download pdf (Page 11)

Owner’s Manual

Another way to use the Low Cut ﬁ lter

is in combination with the LOW EQ on

vocals during live performances.

Many

times, bass shelving EQ can really ben-

eﬁ t voices. Trouble is, adding LOW EQ

also boosts stage rumble, mic handling

clunks, and breath pops. Low Cut removes all those prob-

lems so you can add LOW EQ without losing a woofer.

Here’s what the

combination of LOW EQ

and Low Cut looks like

in terms of frequency

curves.

6. 48V Phantom Power Switch

(Channels 1-4)

Most professional condenser microphones require

phantom power, which is a low-current DC voltage

delivered to the microphone on pins 2 and 3 of the XLR

microphone connector. Push in the 48V button if your

microphone needs phantom power. An LED lights just

above the button to indicate that phantom power is ac-

tive on that channel.

Dynamic microphones, like Shure’s SM57 and SM58,

do not require phantom power. However, phantom

power will not harm most dynamic microphones should

you accidentally plug one in while the phantom power

is turned on. Be careful with older ribbon microphones.

Check the manual for your microphone to ﬁ nd out for

sure whether or not phantom power can damage it.

Note: Be sure the MAIN MIX fader (36) is turned

down when connecting microphones to the MIC Inputs,

especially when phantom power is turned on, to prevent

pops from getting through to the speakers.

7. GAIN Control

If you haven’t already, please read “Set the Levels” on

page 5.

The GAIN control adjusts the input sensitivity of the mic

and line inputs. This allows the signal from the outside

world to be adjusted to optimal internal operating levels.

If the signal is plugged into the XLR jack, there is 0 dB

of gain (unity gain) with the knob turned all the way

down, ramping up to 60 dB of gain fully up.

When connected to the 1/4" jack, there is 20 dB of

attenuation all the way down, and 40 dB of gain fully

up, with a “U” (unity gain) mark at about 10:00. (On the

stereo channels, the GAIN range is –20 dB to +20 dB

with unity in the center.)

8. EQ IN/OUT Switch

This is a true hardware bypass of

the Perkins EQ circuitry to insure

that there is no coloration of the

signal if the EQ is not needed.

When this button is out, the EQ

controls have no effect on the

signal. You can use this switch to

make an A/B comparison between

the EQ’d signal and the signal

without EQ.

We have com-

pletely rede-

signed the EQ

circuits in the

Onyx Series of

mixers, based

on the designs of Cal Perkins, an

industry-leader in audio engineer-

ing for over three decades and

long-time Mackie collaborator. This

“neo-classic” design provides the

sweet musicality of the British EQ

sound, while still maintaining 15 dB

of boost and cut with optimum Q

and minimum phase shift (in other

words, it gives you plenty of control

and is pleasing to the ear!).

The 3-band equalization has LOW

shelving at 80 Hz, MID peaking

(sweepable from 100 Hz to 8 kHz

on the mono channels, ﬁ xed at 2.5

kHz on the stereo channels), and

HIGH shelving at 12 kHz. “Shelving”

means that the circuitry boosts or cuts all frequencies

past the speciﬁ ed frequency. For example, rotating the

LOW EQ knob 15 dB to the right boosts bass frequencies

starting at 80 Hz and continuing on down to the lowest

note you ever heard. “Peaking” means that the frequen-

cies around the center frequency are less affected by

the EQ the further away they are.

9. HIGH EQ

This control gives you up to 15

dB boost or cut at 12 kHz, and it

is also ﬂ at at the center detent.

Use it to add sizzle to cymbals,

and an overall sense of transpar-

ency or edge to the keyboards,

vocals, guitar, and bacon frying.

Turn it down a little to reduce

sibilance, or to hide tape hiss.

20Hz 100Hz 1kHz 10kHz 20kH

–15

–10

–5

+10

+15

Low Cut with Low EQ Boosted

100

10k

20k

–15

–10

–5

+10

+15

High EQ

ALT 3/4

AUX

MAX

OUT

PAN

(MONO)

BAL/

UNBAL

LINE IN 5

GAIN

+20dB-20dB

MID

2.5kHz

+15-15

LOW

80Hz

+15-15

HIGH

12 kHz

MUTE

Stereo Channel

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 31 32

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Mackie 1220 Owner's Manual Page 11

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