Marshall Amplification PA400 User Manual

PA400 FRONT PANEL

PA400 Front Panel
Functions.

Channels 1-6

1. Low impedance XLR input - For the

connection of low impedance
microphones.

2. High impedance Jack input - For the

connection of high impedance
microphones. Also suitable for acoustic
instruments with transducer type
pick-ups.

3-5. Bass, Middle and Treble EQ controls-

A wide range of tonal adjustment can be
selected using combinations of these
controls.

6. Monitor level - Provides the volume level

adjustment from the channel to the
monitor section.

7. Effects Level - Provides level adjustment

of the signal from the channel to effects
units linked through the master effects
loop.

8. Reverb Level - Allows the level of the

built in reverb to be adjusted on the
channel.

9. Volume control - This allows the

individual volume level of the channel to
be adjusted.

Channel 7 (tape channel).

10. Tape inputs - Phono (RCA) sockets to

accept the signal from tape or CD
players.

11. Tape outputs - Phono (RCA) sockets to

provide connection out to cassette or
other recording equipment.

12. Recording level control - Provides level

control of the output to external recording
equipment.

13- 14. Bass and Treble EQ controls - A

wide range of tonal adjustment can be
selected using combinations of these
controls.

15. Monitor control - Controls the level of

the tape signal to the monitor output.

16. Volume control - Provides level control

of the tape channel output.

Master Section.

17. 9 Band Graphic Equalizer - Provides

master EQ control across the audio
spectrum. This feature is particularly
useful for "shaping" the sound to achieve
peak performance in rooms of different
size and texture. Adjustment of -12 to
+12 dB is provided at 63Hz, 125Hz, 250
Hz, 500 Hz, 1 K Hz, 2 K Hz, 4 K Hz, 8 K
Hz and 16 K Hz. The slider tips are
loaded with an LED to provide the
display of graphic "shapes", even on
darkened stages.

18. Master Volume control - Controls the

overall volume level of the amplifier.

19. Master Reverb control - Provides the

overall level control of the reverb.

20. Effects Return control - Controls the

level of the signal returning to the
PA-400 from external effects processors

which would be linked through effects
loop sockets (26 & 27).

21. Effects Send control - Controls the level

of the signal from the PA-400 to the input
of external effects processors.

22.

Monitor output control - Controls the

level of the output from monitor socket
(25) to drive a separate monitor power amp.

23. Effects to Monitor control - Provides

level adjustment of the effects return into
the monitor mix.

24. Reverb to Monitor control - Provides

level adjustment of the reverb into the
monitor mix.

25. Monitor output - Jack socket for

connection to power amplifier driving the
monitor system.

26. Effects Send - Jack socket for connection

to the input of external effects processors.

27. Effects Return - Jack socket which

accepts the signal from the output of
external effects processors.

28.

Footswitch socket - For connection of a

two way (FS02) switch for reverb on/off
and effects loop in/out. If a single
footswitch is used, the reverb only will be
switched.

29. Pre-amp output - Provides a signal

directly out from the pre-amp (also mutes
the power amp) allows external
processing of signal which can then be
returned to Power Amp in socket (30).

30. Power Amp input - Provides a direct

input to the power amp stage of the
PA-400. Also acts as the effects return for
series connected processors linked via
socket (29).

31. Slave output - Sends out an overall

signal from the mixer section, suitable for
driving extra power amps, if the system
needs to be extended.

8

9

1

2

3

4

5

6

7

16

15

17

18

1920

21

22

2324

14

13

12

11

10

25 26

27

28

29 30

31