Mackie 408S Owner's Manual download pdf (Page 24)

24

When a 1/4" plug is inserted in the POWER

AMP IN jacks, the internal connection between

the mixer section and the amplifier section is

cut.

This completely separates the mixer from

the amplifiers, and it allows you to connect an

external equalizer, compressor or effects pro-

cessor in-line between them as shown.

With a plug inserted in the POWER AMP IN

jacks, the amplifiers will only play the external

signals plugged into them. With no plug in-

serted, the mixer section and the amplifier

section are joined and the amplifiers play the

mixer signals as normal.

External equalizer,

compressor, or processor

OUT

IN

L MIXER OUT R MIXER OUT COMPRESSOR

L POWER

AMP IN

R POWER

AMP IN

MONITOR

MAINS

TAPE IN

TAPE OUT

LEVEL

+15

U

OO

LINE

L

R

R

L

OUT

408S

IN

OUT

2 X 250W STEREO

If you have an external device in-line as

shown in the diagram above, make sure it does

not increase the signal gain too much, or it may

overload the amplifier section. The PPM

meters only show the signal level coming from

the internal mixer section; they will not show

any changes in gain due to the external device.

You might use these inputs to connect the

outputs from the opening band’s mixing board.

This way you don’t have to set up two sets of

speakers; the other band can plug right into

the PPM Series and use its amplifiers and con-

nected speakers (see application diagram on

page 13).

MIXER LINE OUT

This is a 1/4" connector that produces an

unbalanced line-level signal. This signal is fed

from the internal mixer bus, just after the

MAIN MASTER

control and

MAIN EQUALIZER

,

and just before the

POWER AMP IN

jacks.

You can use the

MIXER

LINE OUT

s to connect a sec-

ond power amplifier, giving

you the option of adding more

power and more speakers

(see application diagram on

page 10).

MONITOR LINE OUT

This is a 1/4" connector

that produces an unbalanced

line-level signal. This signal is

fed from the internal monitor

bus, just after the

MONITOR MASTER

control

and

MONITOR EQUALIZER

.

Use this connection to drive an external

monitor amplifier and speakers, or to supple-

ment the PPM Series’ monitor amplifier (when

the

POWER AMP ROUTING

switch is

pushed in) with another amplifier and speakers

(see application diagram on page 8).

TAPE IN and TAPE OUT

These are unbalanced RCA-type connectors

that match those typically used on tape decks

and CD players. Use RCA-to-RCA patch cables

to make these connections.

EFX FOOT

SWITCH

RETURN

SEND

MIXER LINE OUT

POWER

AMP 1 IN

POWER

AMP 2 IN

EFFECTS

(OVERRIDES INTERNAL EFX)

MONITOR

MAINS

TAPE IN

TAPE OUT

LEVEL

+15

U

OO

LINE

L

R

R

L

OUT

POWER AMP ROUTING

AMP 1

MAIN

MAIN MONITOR

AMP 2

MAIN

COMPRESSOR

IN

OUT

2 X 250 WATTS

408M

Mono Version Connector Section

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