Mackie 1202 Manuel du propriétaire télécharger pdf (Page 11)

11

Another way to consider

LOW CUT

’s function is that it

actually adds flexibility during

live performances. With the

addition of

LOW CUT

, you can

safely use

LOW

equalization on

vocals.

Many times, bass

shelving

EQ

can really benefit

voices. Trouble is, adding

LOW EQ

also boosts

stage rumble, mic handling clunks and breath

pops.

LOW CUT

removes all those problems 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.

TRIM (Channels 1–4)

If you haven’t already, please read the Level-

Setting Procedure

.

TRIM

adjusts the input sensitivity of the mic

and line inputs connected to channels

1

through

4

. This allows signals from the outside

world to be adjusted to optimal internal oper-

ating levels.

If the signal originates through the XLR

jack, there will be 0dB of gain with the knob

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

Through the

1

⁄

4

" input, there is 15dB of

attenuation fully down and 45dB of gain fully

up, with a “

U

” (unity gain) mark at 10:00. This

15dB of attenuation can be very handy when

you are inserting a signal that is very hot, or

when you want to add a lot of

EQ

gain, or both.

Without this “virtual pad,” a scenario like that

might lead to channel clipping.

To connect balanced lines to these inputs,

use a

1

⁄

4

" Tip-Ring-Sleeve (TRS) plug, the type

found on stereo headphones:

Tip = Positive (+ or hot)

Ring = Negative (– or cold)

Sleeve = Shield or ground

To connect unbalanced lines to these

inputs, use a

1

⁄

4

" mono (TS) phone plug or

standard instrument cable:

Tip = Signal

Sleeve = Ground

LINE IN

inputs

1

–

4

are a good place to con-

nect older instruments that need more gain.

You can correct weak levels by adjusting the

corresponding channel’s

TRIM

control .

LOW CUT (Channels 1–4)

The

LOW CUT

switch, often referred to as a

High Pass Filter (all depends on how you look

at it), cuts bass frequencies below 75Hz at a

rate of 18dB per octave.

We recommend that you use

LOW CUT

on

every microphone application except kick

drum, bass guitar, bassy synth patches, or

recordings of earthquakes. These aside, there

isn’t much down there that you want to hear,

and filtering it out makes the low stuff you do

want much more crisp and tasty. Not only that,

but

LOW CUT

can help reduce the possibility

of feedback in live situations and it helps to

conserve the amplifier power.

SLEEVE

TIPSLEEVE

TIP

RING

RING

TIP

SLEEVERING

SLEEVE

TIP

TIPSLEEVE

TIP

SLEEVE

Low Cut with Low EQ

20Hz 100Hz 1kHz 10kHz 20kHz

–15

–10

–5

0

+5

+10

+15

20

Hz

100

Hz

1k

Hz

10k

Hz

20k

Hz

–15

–10

–5

0

+5

+10

+15

Low Cut

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