Marshall JVM 4 Serie Manual Del Usuario página 7

ENGLISH
The front panel is divided into 3 main
sections: channels, reverb and master. Each
of the channels has 3 modes which are
differentiated by the colour of the light in the
button used to change channel. These are
green, orange or red respectively.
1. POWER SWITCH
This turns the amp on and off.
2. STANDBY SWITCH
The standby switch is used in conjunction with
the power switch to warm up the amp before
use. Turn power switch on for 2 minutes before
switching standby on.
Set the standby switch to the off position
during breaks in performances.
Note: when the standby switch is off the amp
can be used without a load for silent recording.
See the 'Using your amp for silent recording'
start-up procedure for more information.
3. FOOTSWITCH/MIDI PROGRAM SWITCH
This switch has a dual function:
1. Pressing it once will enter 'footswitch
program' mode. This is indicated by a solid
red light.
2. Pressing it twice will enter 'MIDI program'
mode. This is indicated by a blinking red light.
3.1
FRONT PANEL FUNCTIONS
See more information on these modes later in
this manual.
4. FX LOOP SWITCH
Engages/disengages the serial/parallel FX loop
for the current channel.
Note: This switch does not affect the power
amp insert / serial loop.
19. INPUT JACK SOCKET
Connect your guitar here using a ¼" jack
instrument cable.
CHANNEL SECTION
Pressing a channel button has two functions:
•
When pressing in the same channel it
cycles the gain modes: GREEN (lowest
gain level) > ORANGE > RED (highest gain
level)> GREEN etc. Each mode remembers
its own previous FX, reverb and master
settings.
•
Coming from a different channel recalls
the last setting in the new selected
channel.
Note: when you leave and then reselect a
channel, it will automatically recall the last
active mode.
15. CLEAN CHANNEL
Green mode: This is the cleanest of the three
modes. It uses a simple and straightforward
circuit keeping the signal as pure as possible. In
this mode the channel's volume control is taken
out of circuit. This is the only mode where this
happens.
Orange mode: This mode offers a punchy
sound that's easy to overdrive.
Red mode: This is mode adds another gain
stage after the tone stack.
16. CRUNCH CHANNEL
This channel has a more typical Marshall
preamp circuit characteristic of 'gain then tone' .
Green mode: This mode shares the preamp
topology of the classic Marshall JTM45/1959
Plexi™ models (i.e.: gain + gain + tone). This
means the sound and response will be similar
to these vintage amplifiers, but with a bit more
gain than is found in the originals.
Orange mode: This mode is reminiscent of the
JCM800 2203 amplifier and offers gritty, . The
gain structure is gain + gain + gain + tone.
Red mode: This shares the topology of the
orange mode, but with more gain, giving you
sounds similar to a hot-rodded JCM800.
CONTINUED
17. OD1 CHANNEL
Green mode: This is very similar to the sound
found in crunch red mode, allowing you to dial-
in two different crunch sounds.
Orange mode: This adds another gain stage to
the OD1 green mode, resulting in hard rock/
heavy metal tones.
Red mode:Adds more gain to the OD1 orange
for a high gain Marshall sound.
18. OD2 CHANNEL
This channel is similar to the OD1 channel but
with even more gain and the middle control
shifted to being centred around 500hz (instead
of the more typical Marshall value of 650hz).
OD2 provides 3 high gain modes that are ideal
for both lead and modern rhythm metal tones.
REVERB SECTION
The digital reverb is routed in parallel to the
main signal and mixed using a valve. The reverb
does not degrade the direct signal when
engaged and when off it is effectively removed
from the circuit.
10. REVERB SWITCH
Switches the reverb effect on or off for the
current channel.