Mackie CR1604 Owner's Manual download pdf (Page 11)

11

LINE INPUTS

These

1

/

4

" jacks share circuitry (but not

phantom power) with the mic preamps. You

can use these inputs for virtually any signal

you’ll come across, from instrument levels as

low as –40dB to operating levels of –10dBV to

+4dBu, as there is 40dB of gain available via

the

TRIM

knob . Always be sure to perform

the

Level-Setting Procedure

.

To learn how signals are routed from these

inputs:

. To connect balanced lines to these

inputs, use a

1

/

4

" tip-ring-sleeve (TRS) plug,

the type found on some stereo headphones:

Tip = positive (+ or hot)

Ring = negative (– or cold)

Sleeve = shield or ground

To connect unbalanced lines to these in-

puts, use a

1

/

4

" mono (TS) phone plug or

standard instrument cable:

Tip = signal (+)

Sleeve = ground

TRIM

Yes it’s true, these controls are not located

in the patchbay section at all. They’re found

along the top row of knobs in the channel strip

section. But their purpose is so closely linked

with the

MIC

and

LINE

input jacks that we

couldn’t bear to separate them. Here’s why:

Every time you plug something into a

MIC

or

LINE

input jack, you should perform the

Level-

Setting Procedure

, and that procedure is

basically “how to use the

TRIM

knob.”

TRIM

adjusts the input sensitivity of the

MIC

and

LINE

inputs. This allows signals from

the outside world to be adjusted to optimal

internal operating levels.

Through the XLR jack (

MIC

), there will be

10dB of gain with the knob fully down, ramp-

ing to 60dB of gain fully up.

Through the

1

/

4

" input (

LINE

), there is 10dB

of attenuation fully down and 40dB of gain fully

up, with a “

U

” (unity gain) mark at 9:00.

This 10dB of attenuation can be very handy

when you are inserting a signal that is very hot,

or you want to add a lot of EQ gain, or both.

Without this “virtual pad,” a scenario like that

might lead to channel clipping.

INSERT

These

1

/

4

" jacks are for connecting serial

effects processors such as compressors, equaliz-

ers, de-essers, or filters

. The

INSERT

point is

after the

TRIM

control, but before the channel’s

EQ

,

LOW CUT,

fader and

MUTE

controls. Insert

cables must be wired thusly:

“tip”

This plug connects to one of the

mixer’s Channel Insert jacks.

“ring”

tip

ring

sleeve

SEND to processor

RETURN from processor

(TRS plug)

Tip = send (output to effects device)

Ring = return (input from effects device)

Sleeve = common ground

Even though channels 1–8 already have

DIRECT OUT

jacks ,

INSERT

jacks can also

be used as channel direct outputs; post-

TRIM

,

pre-

LOW CUT

, and pre-

EQ

. Here’s three ways

you can use the

INSERT

jacks:

Direct out with no signal interruption to master.

Insert only to first “click.”

Channel Insert jack

Channel Insert jack

Channel Insert jack

Direct out with signal interruption to master.

Insert all the way in to the second “click.”

For use as an effects loop.

(TIP = SEND to effect, RING = RETURN from effect.)

MONO PLUG

MONO PLUG

STEREO

PLUG

DIRECT OUT

Found only on channels 1–8, these

1

/

4

" jacks

deliver the signal from the very end of the

channel path; post-

TRIM

, post-

EQ

, post-

LOW

CUT

, post-fader and post-

MUTE

. They are the

key player in “split monitoring,” making the

CR1604-VLZ perfect for an 8-track studio. To

wire your own cables:

.

PAN

AUX

3

1

2

EQ

5

4

6

5/6

SHIFT

PRE

TRIM

1

SOLO

L - R

3

–

4

1

–

2

OL

-

20

U

OO

+15

U

OO

+15

U

OO

+15

U

+15-15

U

+15-15

800

2k200

8k

U

+15-15

12k

HI

MID

80Hz

LOW CUT

75 Hz

18dB/OCT

LOW

10 0

U

OO

+15

1

MUTE

M

I

C

G

A

I

N

10

U

60

+10dB -40dB

-

1

0

d

B

V

LR

OO

SLEEVE

TIP

TIPSLEEVE

TIP

SLEEVE

SLEEVE

TIPSLEEVE

TIP

RING

RING

TIP

SLEEVERING

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