Manual Marshall JVM215C Combos (page 11 of 60) (English, German, French, Spanish)

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ENGLISH

To confirm the factory reset press OVERDRIVE

MODE switch.

If you want to abort, press any other switch.

Footswitch Reset:

It is possible to reset the footswitch to the

factory default status. This is achieved as

follows:

Unplug the footswitch at any of the cable sides.

Press and hold the switch #4 (right switch).

Plug in the footswitch cord.

Release the switch and the FX led will start

blinking.

If you want to erase the footswitch memory

press the switch #3. To keep the memory press

either the #1 or #2 switch. Please note that once

the memory is erased it cannot be recovered.

Release the switch and the footswitch will

synchronise with the amplifier.

The factory default is as follows:

FSW #1: Clean/Crunch Mode

FSW #2: Overdrive Mode

FSW #3: Master

FSW #4: Reverb

Hints

Hint 1: It is possible to use different modes in

the same channel with different volumes to

avoid imbalance between mode levels. To do

this simply create 2 presets in the footswitch

assigning MASTER 1 or MASTER 2 to any of

the modes.

If you do not connect any effect to the

SERIAL / PARALLEL FX LOOP the MIX control

can be used to act like an extra volume control

in any of the channels.

Hint 2: To have a tuner output muting the

amplifier, connect the tuner to the FX send and

select the Clean channel. Turn the MIX control

to WET and switch the FX loop on. Store this

preset as described before and label it for

example as ʻtunerʼ. Obviously in this

configuration it is not possible to connect any

other effect to the loop.

Hint 3: To use a different preamplifier and

combine it with the JVM channels, connect the

external preamplifier output to the parallel loop

return and turn the MIX to WET. Connect the

external preamp input with a splitter to the

amplifiers input (it might be necessary to use an

active splitter to keep a high impedance and/or

an isolated one to avoid ground loops).

Switching the effects loop ON and OFF will

alternate between the external preamp and the

JVM preamp.

As the JVM reverb circuitry is connected after

the parallel loop it is also possible to create a

preset to add reverb to the external preamp. To

do this, simply switch the reverb ON and create

a preset in any channel with the reverb ON and

FX ON and assign it to the footswitch. That

would be external preamp + reverb.

You can also go further and assign a different

Master level to both external and internal

preamplifiers in the same way as you assigned

reverb.

Hint 4: Notes about using 2 heads

simultaneously. The suggested procedure is

connect the ʻmasterʼ head PREAMP OUT to the

ʻslaveʼ head POWER AMP IN and switch the

POWER AMP INSERT to ACTIVE in the ʻslaveʼ

amplifier.

In order to track the master volume settings in

both heads (as the master volume circuitry is

wired after the loop) it is suggested to use MIDI

control with both amplifiers programmed in the

same way. Connect the MIDI IN of one of the

amplifiers to the MIDI THROUGH of the other

and the pedalboard or MIDI equipment to the

remaining MIDI IN.

JVM 2 Ch Owners Manual Book-00089-01 /12/15 inner.qxd:Layout 1 14/12/15 10:09 Page 9

ENGLISH

Rear Panel Operation

SERIAL / PARALLEL FX LOOP (12)

The JVM is equipped with a series / parallel FX

loop. Connect your external FX equipment input

to the JVM SEND jack, and the FX output to the

JVM RETURN jack. As described previously,

this effects loop can be bypassed from the front

panel and the amount of effect can be dialed in

with the MIX control.

The +4dBu/-10dBV switch allows you to

configure the loop for its use with either

professional equipment (+4dBu setting) or with

guitar level effects like effects pedals (-10dBV

setting).

When MIX is set to WET all the signal goes

through the external loop, adding more direct

(unprocessed) signal as you turn it towards

DRY. This allows you to mix any amount of the

external effect without loosing or degrading the

direct signal quality.

When mixing the WET and DRY signals the

external effects processorʼs output should be

configured to remove the direct (unprocessed)

signal or unpleasant phasing effects may occur

when mixing it again in the amplifier. If the

amplifier sounds thin after connecting an

external effect check that no direct signal is

being returned from the processorʼs output.

Note that if the FX loop is ON and the MIX

control is set to WET without an external

processor connected, the amplifier will be

muted.

POWER AMP INSERT / SERIAL LOOP (13)

This is a passive loop connected right before the

master controls. It is a line level loop so it is

recommended to only use high headroom

devices to avoid signal degradation. Plugging

only into the return jack allows the use of the

JVMʼs power section overriding the preamp.

Master controls and the emulated line out are

located after the serial loop so it is still possible

to take advantage of those features when using

an external preamplifier. The loop can be taken

off the circuit by pressing the BYPASS switch,

but as opposed to the Series / Parallel loop this

switch cannot be programmed.

EMULATED LINE OUT (14)

The pre master volume signal, processed

through a 4x12 speaker cabinet emulator and

electronically balanced is made available at this

connector.

FOOTSWITCH (15)

Connect the supplied footswitch using any

standard 1/4" jack mono lead. Using any other

type of footswitch rather than the supplied will

have no effect and will be ignored by the

amplifier.

MIDI In / Through (16)

Connect any external MIDI equipment to the

MIDI In DIN socket. A copy of the signal in this

connector will be available on the MIDI thru

socket to allow daisy chaining of MIDI

equipment. Note that the JVM only accepts

incoming data and it is not able to send any

MIDI commands.

SPEAKER Outputs (11)

There are 5 speaker outputs available on the

rear panel. They are labelled according to the

intended impedances:

16 Ohm: connect any 16 Ohms guitar cabinet to

this jack.

8 Ohm: connect a single 8 Ohms guitar cabinet

or two 16 Ohms guitar cabinets.

4 Ohm: connect a single 4 Ohms guitar cabinet

or two 8 Ohms guitar cabinets.

WARNING: Although the JVM amplifier has 5

speaker outputs, never attempt to connect more

speakers than rated. The safe combinations are

1x16 Ohm, 1x8 Ohm, 1x4 Ohm, 2x16 Ohm or

2x8 Ohm. Any other speaker configuration may

stress the power amplifier section and in

extreme cases may lead to valve and/or output

transformer failure.

HINTS & TIPS

Factory Reset

This will erase all the MIDI presets and set MIDI

reception channel to #1. Please note that once

the memory is erased it cannot be recovered.

Switch the amplifier off (power switch off, not

standby switch).

Press and hold CLEAN/CRUNCH CHANNEL

switch.

Switch the amplifier on (power switch on, not

standby switch).

The 2 channel LEDs will glow red.

Release the switch.

JVM 2 Ch Owners Manual Book-00089-01 /12/15 inner.qxd:Layout 1 14/12/15 10:08 Page 8

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Marshall JVM215C Combos Manual

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