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Overview
I. Channels, Modes & Memory
Presenting the 4-channel, 100 Watt, all-valve
JVM amplifier (JVM410H head or JVM410C
2x12" combo). Its 4 channels boast 3 modes,
giving you a total of 12 different modes to
choose from - each with its own unique gain
structure. Even though its front panel contains a
total of 28 control knobs and 8 LED switches,
the JVM is simple to understand and operate
thanks to its extremely logical front and rear
panel layouts.
The front panel contains dedicated sets of
controls for each of its 4 channels - CLEAN,
CRUNCH, OD1 & OD2 - plus MASTER and
REVERB sections. Each channel contains the
familiar controls, Volume, Bass, Middle, Treble
and Gain. The REVERB section consists of 4
Reverb level controls, one for each channel
while the MASTER section is comprised of 2
footswitchable Master Volumes, plus master
RESONANCE and PRESENCE controls that
work universally on all 4 channels.
Each of the 4 channels has 3 switchable modes.
These are selected by the MODE switch
dedicated to each channel. To select a channel
press its respective MODE switch (or step on
the relevant button on the supplied 6-way
footswitch - see section II. Footswitch). To
scroll through the selected channel's 3 modes
keep pressing the said button and the colour of
the LED in the switch will change from green to
orange to red and then back to green. Doing this
steps-up the gain level each time (red being the
highest and green the lowest for each channel)
and changes the channel's tonal voicing to suit.
When you leave and then reselect a channel, it
will automatically recall the last active mode as
all 4 channels remember the last mode they
were in until a change is made. For instance, if
you select the Crunch channel’s orange mode
and then go to the Clean channel, when you
reselect the Crunch channel it will still be
orange.
In addition to channel and Mode selection, other
features switchable via the front panel and the
supplied 6-way footswitch are Reverb (on/of
f)
Master V
olume selection (1 or 2), and
Series/Parallel effects loop (on/off). All 3 of
these options are also remembered by each
Mode.
To sum up, each of the JVM’s 12 Modes will
remember it’s most recent Reverb, FX loop and
Master Volume selection. Additionally mode
setups can also be saved and recalled to one of
128 locations via MIDI.
II. Footswitch (UK patent pending)
The JVM410H or JVM410C come supplied with
a 6-way programmable footswitch which can be
connected to the amp via any standard guitar
cable.
*Please note that the supplied Footswitch lead is
unscreened and not suitable for guitar.
The 6-button footswitch features 7 LEDS
marked CLEAN, CRUNCH, OD1, OD2,
MASTER, REVERB & FX. The LEDs for each of
the 4 channels are 3-coloured Green, Orange
and Red, visually telling you which channel and
mode is selected alongside the status of Master,
Reverb and FX loop.
The footswitch enables you to assign any of its
6 switches to instantly recall any front panel
function (Switch Store Mode) or complete
channel setup (Preset Store Mode) in any order
and combination.
For example, you could program it so that:
Switch Store Mode
Any footswitch is assigned to act as any one of
your amp’s front panel switches:
Channel/Mode; Reverb on/off; Master Volume
1/2 and FX Loop on/off.
If a switch is assigned to select a particular
channel once is has been activated, it can be
used to scroll through the three modes, just like
its respective front panel switch.
Or…
Preset Store Mode
Each switch can be programmed to instantly call
up a combination of JVM button options to form
a Preset. For example, you could program it so
that:
Footswitch #1 = Crunch channel, green mode
with Master Volume ‘1’, Reverb ‘on’ and FX loop
‘off’.
ENGLISH
ENGLISH
Footswitch #2 = Clean channel, red mode with
Master Volume ‘2’, Reverb ‘off’ and FX loop on.
All the settings are stored within your footswitch;
this means it can be plugged into any JVM
4-Channel amplifier and all your footswitch
settings can be instantly recalled.
Details on how to program your footswitch can
be found later in this manual.
III. Power Amp
The power amp stage of the 100 Watt JVM is
based on the same as the one found in the
JCM800 2203 and 1959 Superlead amplifiers,
responsible for the legendary Marshall roar it
has been adjusted to suit the variety of tones
found in the JVM. This section features
Presence and Resonance control to help shape
the overall tone of your JVM amplifier.
Your JVM is also equipped with a Silent
Recording mode. When the STANDBY switch is
OFF the power amplifier section is disabled but
the rest of the amplifier remains fully
operational.
IV. Studio Quality Reverb
The Marshall JVM410H and JVM410C are
equipped with a studio quality digital reverb
routed in parallel to the main signal and mixed
by means of a valve. When the reverb is
engaged no degradation of the direct signal
occurs and when off it is effectively removed
from the circuit. Each of the JVM’s 4 channels
also has its own dedicated Reverb level control.
The Reverb switching has been designed to
avoid abrupt cut offs in the reverb tail so when
changing from channel to channel or switching
the reverb off, its tail naturally decays.
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