Untitled - Marshall Amps

60 Pages·2017·9.1 MB·Spanish

JVM 2 Ch Owners Manual Book-00089-01 /12/15 cover.qxd:Layout 1 14/12/15 12:01 Page 5
Contents
English
Welcome from Jim Marshall 1
Overview 2
The Basics 4
Channel Overview 5
Front Panel Operation 6
Rear Panel Operation 8
Technical Specification 10
Español
Bienvenida de Jim Marshall 11
Descripción General 12
Lo Básico 14
Descripción General del Canal 15
Panel Frontal 16
Panel Trasero 18
Especificaciones Técnicas 20
Deutsch
Ein Gruß von Jim Marshall 21
Übersicht 22 B
Die Basics 24
Kanal-Übersicht 25
Frontpanel Bedienung 26
Bedienelmente Auf Der Ruckseite 28
Technische Daten 30
Français
De la part de Jim Marshall 31
Présentation 32
Les Bases 34
Présentation du canal 35
Fonctionnement de la façade 36
Fonctionnement de la face arrière 38
Caractéristiques Techniques 40
Japanese
41
42
44
45
46
48
50
JVM 2 Ch Owners Manual Book-00089-01 /12/15 inner.qxd:Layout 1 14/12/15 10:07 Page 1
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INTRODUCTION
Congratulations on the purchase of your all-valve JʻVM ʼSeries amplifier, which is
designed, engineered and constructed to the highest possible standards at the
Marshall factory in Bletchley, England. At Marshall we understand the necessity of
achieving the right tone and feel to help inspire you to reach your full creative
potential. Listening to what guitarists want, painstaking R&D and a commitment to
manufacturing excellence has made the Marshall legend. These values have remained
at the core of Marshallsʼ identity, from 1962 to the present day, and will continue to do
so over the next half century and beyond.
Your ʻJVM ʼSeries amplifier has been designed to produce a broad sonic palette,
making it an incredibly versatile tool, whether performing live on stage, recording or
rehearsing. It can take you from classic Marshall JTM45™/ Plexi™ clean and
overdriven tones to JCM800™ grunt and on to contemporary high gain insanity. Fully
programmable, the JʻVM ʼSeries has unprecedented tonal control, with three modes
per channel, independent Reverbs, Parallel/Series FX Loop and Stompware®
footswitching technology.
The ʻJVM ʼSeries is truly a testament to the Marshall legacy of great guitar products
and we sincerely hope that your JʻVM ʼamplifier proves indispensable, providing you
with years of legendary Marshall tone, whatever your playing situation.
Thank you for choosing Marshall.
-The Marshall Team
1
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Overview
I. Channels, Modes & Memory setups can also be saved and recalled to one of For example, you could program a mixture of
Presenting the 2-channel, 100W and 50W 128 locations via MIDI. switching functions (in our example switches #1
all-valve JVM amplifiers. Their 2 channels boast and #2 work in Preset Store mode, and #3 plus
3 modes, giving you a total of 6 different modes II. Footswitch (UK patent pending) #4 work in Switch Store mode), so that:
to choose from - each with its own unique gain The JVM come supplied with a 4-way
H structure. Even though their front panel contains programmable footswitch which can be Footswitch #1 = Overdrive channel, green mode E
S a total of 16 control knobs and 6 LED switches, connected to the amp via any standard guitar with Master Volume 1ʻʼ, Reverb oʻn ʼand FX loop N
I the JVM is simple to understand and operate cable. ʻoffʼ. G
L
G thanks to its extremely logical front and rear L
panel layouts. Footswitch #2 = Clean channel, red mode with I
N S
E Master Volume 2ʻʼ, Reverb oʻff ʼand FX loop on. H
The front panel contains dedicated sets of
MODEL: PEDL-00045
controls for each of their 2 channels - Footswitch #3 = FX loop on/off
CLEAN / CRUNCH and OVERDRIVE - plus 1 2 3 4
MASTER and REVERB sections. Each channel Footswitch #4 = Master 1/2
contains the familiar controls, Volume, Bass,
Middle, Treble and Gain. The REVERB section All the settings are stored within your footswitch;
consists of 2 Reverb level controls, one for each this means it can be plugged into any JVM
channel while the MASTER section is comprised amplifier and all your footswitch settings can be
of 2 footswitchable Master Volumes, plus master instantly recalled.
RESONANCE and PRESENCE controls that *Please note that the supplied Footswitch lead is
work universally on both channels. unscreened and not suitable for guitar. Details on how to program your footswitch can
be found later in this manual.
Each of the 2 channels has 3 switchable modes. The 4-button footswitch features 5 LEDS
These are selected by the MODE switch marked CLEAN / CRUNCH, OD, MASTER, III. Power Amp
dedicated to each channel. To select a channel REVERB & FX. The LEDs for each of the 2 The power amp stage of the JVMs is based on
press its respective MODE switch (or step on channels are 3-coloured Green, Orange and the same as the one found in the JCM800 2203
the relevant button on the supplied 4-way Red, visually telling you which channel and and 1959 Superlead amplifiers and their 50W
footswitch - see section II. Footswitch). To mode is selected alongside the status of Master, cousins, responsible for the legendary Marshall
scroll through the selected channel's 3 modes Reverb and FX loop. roar it has been adjusted to suit the variety of
keep pressing the said button and the colour of tones found in the JVM. This section features
the LED in the switch will change from green to The footswitch enables you to assign any of its Presence and Resonance control to help shape
orange to red and then back to green. Doing this 4 switches to instantly recall any front panel the overall tone of your JVM amplifier.
steps-up the gain level each time (red being the function (Switch Store Mode) or complete
highest and green the lowest for each channel) channel setup (Preset Store Mode) in any order Your JVM is also equipped with a Silent
and changes the channel's tonal voicing to suit. and combination. Recording mode. When the STANDBY switch is
OFF the power amplifier section is disabled but
When you leave and then reselect a channel, it For example, you could program it so that: the rest of the amplifier remains fully
will automatically recall the last active mode as operational.
both channels remember the last mode they Switch Store Mode
were in until a change is made. For instance, if Any footswitch is assigned to act as any one of IV. Studio Quality Reverb
you select the Overdrive channel's orange mode your ampsʼ front panel switches: The Marshall JVM is equipped with a studio
and then go to the Clean channel, when you Channel/Mode; Reverb on/off; Master Volume quality digital reverb routed in parallel to the
reselect the Overdrive channel it will still be 1/2 and FX Loop on/off. main signal and mixed by means of a valve.
orange. When the reverb is engaged no degradation of
If a switch is assigned to select a particular the direct signal occurs and when off it is
In addition to channel and Mode selection, other channel once is has been activated, it can be effectively removed from the circuit. Each of the
features switchable via the front panel and the used to scroll through the three modes, just like JVMsʼ channels also has its own dedicated
supplied 4-way footswitch are Reverb (on/off) its respective front panel switch. Reverb level control.
Master Volume selection (1 or 2), and
Series/Parallel effects loop (on/off). All 3 of Or… The Reverb switching has been designed to
these options are also remembered by each avoid abrupt cut offs in the reverb tail so when
Mode. Preset Store Mode changing from channel to channel or switching
Each switch can be programmed to instantly call the reverb off, its tail naturally decays.
To sum up, each of the JVMs 6 Modes will up a combination of JVM button options to form
remember its most recent Reverb, FX loop and a Preset.
Master Volume selection. Additionally mode
2 3
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Overview
I. Channels, Modes & Memory setups can also be saved and recalled to one of For example, you could program a mixture of
Presenting the 2-channel, 100W and 50W 128 locations via MIDI. switching functions (in our example switches #1
all-valve JVM amplifiers. Their 2 channels boast and #2 work in Preset Store mode, and #3 plus
3 modes, giving you a total of 6 different modes II. Footswitch (UK patent pending) #4 work in Switch Store mode), so that:
to choose from - each with its own unique gain The JVM come supplied with a 4-way
H structure. Even though their front panel contains programmable footswitch which can be Footswitch #1 = Overdrive channel, green mode E
S a total of 16 control knobs and 6 LED switches, connected to the amp via any standard guitar with Master Volume 1ʻʼ, Reverb oʻn ʼand FX loop N
I the JVM is simple to understand and operate cable. ʻoffʼ. G
L
G thanks to its extremely logical front and rear L
panel layouts. Footswitch #2 = Clean channel, red mode with I
N S
E Master Volume 2ʻʼ, Reverb oʻff ʼand FX loop on. H
The front panel contains dedicated sets of
MODEL: PEDL-00045
controls for each of their 2 channels - Footswitch #3 = FX loop on/off
CLEAN / CRUNCH and OVERDRIVE - plus 1 2 3 4
MASTER and REVERB sections. Each channel Footswitch #4 = Master 1/2
contains the familiar controls, Volume, Bass,
Middle, Treble and Gain. The REVERB section All the settings are stored within your footswitch;
consists of 2 Reverb level controls, one for each this means it can be plugged into any JVM
channel while the MASTER section is comprised amplifier and all your footswitch settings can be
of 2 footswitchable Master Volumes, plus master instantly recalled.
RESONANCE and PRESENCE controls that *Please note that the supplied Footswitch lead is
work universally on both channels. unscreened and not suitable for guitar. Details on how to program your footswitch can
be found later in this manual.
Each of the 2 channels has 3 switchable modes. The 4-button footswitch features 5 LEDS
These are selected by the MODE switch marked CLEAN / CRUNCH, OD, MASTER, III. Power Amp
dedicated to each channel. To select a channel REVERB & FX. The LEDs for each of the 2 The power amp stage of the JVMs is based on
press its respective MODE switch (or step on channels are 3-coloured Green, Orange and the same as the one found in the JCM800 2203
the relevant button on the supplied 4-way Red, visually telling you which channel and and 1959 Superlead amplifiers and their 50W
footswitch - see section II. Footswitch). To mode is selected alongside the status of Master, cousins, responsible for the legendary Marshall
scroll through the selected channel's 3 modes Reverb and FX loop. roar it has been adjusted to suit the variety of
keep pressing the said button and the colour of tones found in the JVM. This section features
the LED in the switch will change from green to The footswitch enables you to assign any of its Presence and Resonance control to help shape
orange to red and then back to green. Doing this 4 switches to instantly recall any front panel the overall tone of your JVM amplifier.
steps-up the gain level each time (red being the function (Switch Store Mode) or complete
highest and green the lowest for each channel) channel setup (Preset Store Mode) in any order Your JVM is also equipped with a Silent
and changes the channel's tonal voicing to suit. and combination. Recording mode. When the STANDBY switch is
OFF the power amplifier section is disabled but
When you leave and then reselect a channel, it For example, you could program it so that: the rest of the amplifier remains fully
will automatically recall the last active mode as operational.
both channels remember the last mode they Switch Store Mode
were in until a change is made. For instance, if Any footswitch is assigned to act as any one of IV. Studio Quality Reverb
you select the Overdrive channel's orange mode your ampsʼ front panel switches: The Marshall JVM is equipped with a studio
and then go to the Clean channel, when you Channel/Mode; Reverb on/off; Master Volume quality digital reverb routed in parallel to the
reselect the Overdrive channel it will still be 1/2 and FX Loop on/off. main signal and mixed by means of a valve.
orange. When the reverb is engaged no degradation of
If a switch is assigned to select a particular the direct signal occurs and when off it is
In addition to channel and Mode selection, other channel once is has been activated, it can be effectively removed from the circuit. Each of the
features switchable via the front panel and the used to scroll through the three modes, just like JVMsʼ channels also has its own dedicated
supplied 4-way footswitch are Reverb (on/off) its respective front panel switch. Reverb level control.
Master Volume selection (1 or 2), and
Series/Parallel effects loop (on/off). All 3 of Or… The Reverb switching has been designed to
these options are also remembered by each avoid abrupt cut offs in the reverb tail so when
Mode. Preset Store Mode changing from channel to channel or switching
Each switch can be programmed to instantly call the reverb off, its tail naturally decays.
To sum up, each of the JVMs 6 Modes will up a combination of JVM button options to form
remember its most recent Reverb, FX loop and a Preset.
Master Volume selection. Additionally mode
2 3
JVM 2 Ch Owners Manual Book-00089-01 /12/15 inner.qxd:Layout 1 14/12/15 10:08 Page 4
The Basics
We recommend that you fold out the inside back Marshall recommends you always leave a
cover of this manual so that diagrams of the (speaker) load attached to the unit.
ampsʼ front and rear panels are visible while you
read. 2. Ensure that both MASTER VOLUMES on the
front panel (5) are set to zero.
H MAINS INPUT & FUSE (17)
S Your amp is provided with a detachable mains 3. Connect the Footswitch Cable to the
I (power) lead, which is connected here. The Footswitch and then connect to the
L
specific mains input voltage rating that your FOOTSWITCH Socket (15) on the rear panel of
G
amplifier has been built for is indicated on the the amplifier.
N
rear panel.
E
4. Connect the supplied mains (power) lead into
WARNING: Before going any further, make the MAINS INPUT (17) on the rear panel first
sure your amplifier is compatible with your and then into an electrical outlet.
electrical supply. If you have any doubt,
please get help from a qualified technician - 5. Plug your guitar into the INPUT jack socket
your Marshall dealer can help you in this (10) on the front panel.
respect.
6. Turn the front panel POWER switch (1) on.
The correct value of mains fuse is specified on This will glow red then wait for a couple of
the rear panel of the amplifier. NEVER attempt minutes.
to bypass the fuse or fit one of the incorrect
value. 7. After waiting a couple of minutes, engage the
STANDBY switch (2). Leaving the amp on
Mains (POWER) Switch (1) ʻStandby ʼfor a period allows the valves to come
This is the On/Off switch for the mains electric up to their correct operating temperature. In
power to the amplifier. order to prolong valve life, the STANDBY switch
should also be used to turn the amplifier on and
Note: Please ensure the amplifier is switched off off during breaks in a performance.
and unplugged from the mains electricity supply
whenever it is moved! STANDBY Switch & Silent recording (2)
As stated above the STANDBY Switch is used in
INPUT Jack Socket (10) conjunction with the POWER Switch to wʻ arm
You must always use a screened (shielded) up ʼthe amplifier before use and to prolong the
guitar cable and never use an unscreened life of the output valves.
(unshielded) speaker cable. Also, this cable
should be one of good quality. If you are in any When the amplifier is in standby mode the
doubt regarding this, your Marshall dealer will be whole preamplifier section continues running at
more than happy to help and advise you. its nominal voltages whilst the power amplifier
remains in a standby status. This allows the
Getting Started & Powering Up amplifier to be used for silent recording or
1. Make sure that the speakers/cabinet(s) are preamplification purposes.
connected to the correct impedance
LOUDSPEAKER jack(s) on the rear panel (11). NOTE : Only when the STANDBY is off can
See page 8 for specifics regarding impedance the amplifier be used without a load for silent
matching. If yourʼe using an extension cabinet recording.Always ensure a load is
make sure its rating is enough to handle the connected when leaving the silent recording
power of the amp and also that yourʼe using a mode, i.e. when switching the STANDBY
proper speaker cable. Never use a screened switch ON.
(shielded) guitar cable for this purpose.
WARNING!
1. Failure to do any of the above will damage
your amp.
2. NEVER use your amp without a (speaker)
load attached when the Standby Switch is
ON.
4
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The Basics Channel Overview
We recommend that you fold out the inside back Marshall recommends you always leave a The JVMsʼ front panel is divided into 2 main
cover of this manual so that diagrams of the (speaker) load attached to the unit. sections: Channels and Master. Each of its
ampsʼ front and rear panels are visible while you channels has 3 modes which are distinguished
read. 2. Ensure that both MASTER VOLUMES on the by a different coloured light (green, orange or
front panel (5) are set to zero. red) appearing in the respective MODE switch;
H MAINS INPUT & FUSE (17) the preamplifiersʼ gain structure is uniquely E
S Your amp is provided with a detachable mains 3. Connect the Footswitch Cable to the reconfigured for each and every mode. N
I (power) lead, which is connected here. The Footswitch and then connect to the G
GL specific mains input voltage rating that your FOOTSWITCH Socket (15) on the rear panel of CLEAN/CRUNCH CHANNEL (8) L
amplifier has been built for is indicated on the the amplifier. CLEAN/CRUNCH GREEN MODE: This is the I
N S
E rear panel. cleanest of the three modes and, in keeping with H
4. Connect the supplied mains (power) lead into traditional clean amps, it uses a simple and
WARNING: Before going any further, make the MAINS INPUT (17) on the rear panel first straightforward circuit keeping the signal as pure
sure your amplifier is compatible with your and then into an electrical outlet. as possible. In this Mode the channelsʼ Volume
electrical supply. If you have any doubt, control is taken out of circuit as is the case in
please get help from a qualified technician - 5. Plug your guitar into the INPUT jack socket vintage amplifiers of this nature. This is the only
your Marshall dealer can help you in this (10) on the front panel. JVM mode where this happens.
respect.
6. Turn the front panel POWER switch (1) on. CLEAN/CRUNCH ORANGE MODE: This mode
The correct value of mains fuse is specified on This will glow red then wait for a couple of shares the preamp topology of the classic
the rear panel of the amplifier. NEVER attempt minutes. Marshall JTM45/1959 Pʻ lexi ʼmodels (i.e.: gain +
to bypass the fuse or fit one of the incorrect gain + tone) but with a bit more gain than is
value. 7. After waiting a couple of minutes, engage the found in the originals.
STANDBY switch (2). Leaving the amp on
Mains (POWER) Switch (1) ʻStandby ʼfor a period allows the valves to come CLEAN/CRUNCH RED MODE: This mode is
This is the On/Off switch for the mains electric up to their correct operating temperature. In reminiscent of the Marshall JCM800 2203
power to the amplifier. order to prolong valve life, the STANDBY switch amplifier, a staple of hard rock. The gain
should also be used to turn the amplifier on and structure is gain + gain + gain + tone.
Note: Please ensure the amplifier is switched off off during breaks in a performance.
and unplugged from the mains electricity supply OVERDRIVE CHANNEL (9)
whenever it is moved! STANDBY Switch & Silent recording (2) OVERDRIVE GREEN MODE: This is very
As stated above the STANDBY Switch is used in similar to the hot-rodded JCM800 sound found
INPUT Jack Socket (10) conjunction with the POWER Switch to wʻ arm in ʻCrunch Red,ʼ allowing you to dial-in two
You must always use a screened (shielded) up ʼthe amplifier before use and to prolong the distinctly different yet similar crunch sounds if
guitar cable and never use an unscreened life of the output valves. you so wish - one in each channel.
(unshielded) speaker cable. Also, this cable
should be one of good quality. If you are in any When the amplifier is in standby mode the OVERDRIVE ORANGE MODE:This adds
doubt regarding this, your Marshall dealer will be whole preamplifier section continues running at another gain stage to the Oʻ verdrive Greenʼ
more than happy to help and advise you. its nominal voltages whilst the power amplifier circuit, resulting in a sound thatsʼ perfect for
remains in a standby status. This allows the singing leads and hard rock/heavy metal tones.
Getting Started & Powering Up amplifier to be used for silent recording or
1. Make sure that the speakers/cabinet(s) are preamplification purposes. OVERDRIVE RED MODE: Adds more gain to
connected to the correct impedance the ʻOverdrive Orange ʼfor a high gain Marshall
LOUDSPEAKER jack(s) on the rear panel (11). NOTE : Only when the STANDBY is off can sound.
See page 8 for specifics regarding impedance the amplifier be used without a load for silent
matching. If yourʼe using an extension cabinet recording.Always ensure a load is
make sure its rating is enough to handle the connected when leaving the silent recording
power of the amp and also that yourʼe using a mode, i.e. when switching the STANDBY
proper speaker cable. Never use a screened switch ON.
(shielded) guitar cable for this purpose.
WARNING!
1. Failure to do any of the above will damage
your amp.
2. NEVER use your amp without a (speaker)
load attached when the Standby Switch is
ON.
4 5
JVM 2 Ch Owners Manual Book-00089-01 /12/15 inner.qxd:Layout 1 14/12/15 10:08 Page 6
Front Panel Operation
Channel Section Presence and Resonance constitute a powerful
Pressing a channel button has two functions: power amplifier equaliser, allowing responses
from a ^ʻ ʼshape when they are fully
When coming from a different channel it recalls counterclockwise, which is felt as a mid boost,
the last setting in the new selected channel. to a vʻ ʼshape when they are turned clockwise,
H which is felt as a scooped sound. Again, the
S When pressing in the same channel it cycles the effectiveness of these controls is highly
I modes: GREEN > ORANGE > RED > GREEN... dependant on the kind of connected speakers.
L
Care has to be taken to avoid over excursion of
G
Each mode remembers the FX, Reverb and the speaker cones in high resonance settings.
N
Master settings.
E
FX LOOP (4)
Example: You are in OVERDRIVE ORANGE This is a programmable FX loop which features
with FX + REVERB and you press CLEAN. The a MIX control on the rear panel and it is located
amp switches to the last Clean mode you had after the pre-amp, right before the reverb and
(letsʼ assume it was CLEAN GREEN with serial loop circuits. Pressing the FX Loop switch
REVERB). If you press the OVERDRIVE switch (4) engages this effects loop. Please refer to the
you go back to OVERDRIVE ORANGE with FX Serial / Parallel Loop description later on in the
+ REVERB. This allows bouncing between handbook for its operation.
channels without losing the settings. If you now
press OVERDRIVE again, you go to FOOTSWITCH / MIDI PROGRAM (3)
OVERDRIVE RED with whatever FX, MASTER This switch has a dual function:
and REVERB settings you had last time you
were in this mode. Pressing it once we enter the FOOTSWITCH
PROGRAM mode. It is indicated by a
Pressing REVERB (7) switches the reverb ON continuous red light.
and OFF in the current channel.
Pressing it twice we enter the MIDI PROGRAM
Pressing FX LOOP (4) switches the parallel FX mode. It is indicated by a blinking red light.
loop ON and OFF in the current channel.
Footswitch program and use
Master Section The JVM range features a new type of fully
REVERB Control (7) configurable footswitch. Connection to the
Alongside the REVERB switch each channel amplifier requires a standard mono 1/4" jack to
has its own reverb control allowing individual jack cable. Any guitar lead will work and
level settings of the effect. practically there should be no limit in its length.
MASTER 1 / MASTER 2 (5) When the front panel FOOTSWITCH / MIDI
These are the master volume controls of the PROGRAM switch is off, the footswitch operates
amplifier. They can be assigned individually to in safe mode and executes the commands the
each of the modes as you wish and the master moment the switch is pressed down.
selection will be stored in each of the modes.
If you enter the FOOTSWITCH PROGRAM
PRESENCE, RESONANCE (6) mode (LED red) you will be able to program the
These controls are power amplifier controls and footswitch but nevertheless the footswitch and
only have effect when playing through a speaker the amplifier will remain fully operational with the
(not in silent recording). They affect how the only difference that the commands will be
power amplifier reacts to the connected executed when releasing the footswitches, as
speakers and how much control the amplifier opposed to the normal mode.
has over them.
Each of the individual footswitches has 2 modes
Increasing the RESONANCE control of operation: preset storeand switch store.
emphasises the natural speakersʼ resonance for
an improved bass response. In the same way, In preset storemode, any of the footswitches
increasing the PRESENCE control emphasises can be configured to store the current amplifier
the speakersʼ high frequencies which will be status. The current channel, master, FX and
heard as an improved high frequency response reverb status will be stored and recalled when
which adds presence to the sound. the respective footswitch is pressed.
6
JVM 2 Ch Owners Manual Book-00089-01 /12/15 inner.qxd:Layout 1 14/12/15 10:08 Page 6 JVM 2 Ch Owners Manual Book-00089-01 /12/15 inner.qxd:Layout 1 14/12/15 10:08 Page 7
Front Panel Operation
Channel Section Presence and Resonance constitute a powerful To store the current status simply: MIDI operation
Pressing a channel button has two functions: power amplifier equaliser, allowing responses Pressing the FOOTSWITCH / MIDI PROGRAM
from a ^ʻ ʼshape when they are fully Set the amplifier to FOOTSWITCH PROGRAM switch (3) twice puts the amplifier in MIDI
When coming from a different channel it recalls counterclockwise, which is felt as a mid boost, mode (red light ON). waiting mode, the LED will flash until a valid
the last setting in the new selected channel. to a vʻ ʼshape when they are turned clockwise, MIDI program change command is received.
H which is felt as a scooped sound. Again, the Press and hold the desired switch for about 3 E
S When pressing in the same channel it cycles the effectiveness of these controls is highly seconds. On reception of a MIDI program change N
I modes: GREEN > ORANGE > RED > GREEN... dependant on the kind of connected speakers. command the amplifier stores the current status G
L
G Care has to be taken to avoid over excursion of The FX footswitch LED will flicker a couple of (Channel + FX + Reverb + Master Settings) in L
Each mode remembers the FX, Reverb and the speaker cones in high resonance settings. times indicating that the preset has been stored. the MIDI program number received. It is I
N S
E Master settings. possible to store up to 128 different MIDI H
FX LOOP (4) In switch storemode, any of the footswitches presets.
Example: You are in OVERDRIVE ORANGE This is a programmable FX loop which features can be configured to replicate the front panel
with FX + REVERB and you press CLEAN. The a MIX control on the rear panel and it is located switches and the amplifier will react exactly in To exit this status without waiting for incoming
amp switches to the last Clean mode you had after the pre-amp, right before the reverb and the same way as when you operate them on the MIDI data press the FOOTSWITCH / MIDI
(letsʼ assume it was CLEAN GREEN with serial loop circuits. Pressing the FX Loop switch front panel. PROGRAM switch (3) again.
REVERB). If you press the OVERDRIVE switch (4) engages this effects loop. Please refer to the
you go back to OVERDRIVE ORANGE with FX Serial / Parallel Loop description later on in the All the front panel switches can be mapped to Note about MIDI channels: By default the
+ REVERB. This allows bouncing between handbook for its operation. any of the footswitches without any limitation. amplifier is configured to listen to MIDI channel
channels without losing the settings. If you now The only exception is the FOOTSWITCH / MIDI #1 but it can be changed to listen to any of the
press OVERDRIVE again, you go to FOOTSWITCH / MIDI PROGRAM (3) PROGRAM switch which cannot be assigned to 16 MIDI channels as follows:
OVERDRIVE RED with whatever FX, MASTER This switch has a dual function: the footswitch.
and REVERB settings you had last time you Switch the amplifier off (Power switch (1), not
were in this mode. Pressing it once we enter the FOOTSWITCH To assign any of the front panel switches Standby (2)).
PROGRAM mode. It is indicated by a (except FOOTSWITCH / MIDI PROGRAM) to
Pressing REVERB (7) switches the reverb ON continuous red light. any of the footswitches simply: Press and hold the FOOTSWITCH / MIDI
and OFF in the current channel. PROGRAM switch (3).
Pressing it twice we enter the MIDI PROGRAM Set the amplifier to FOOTSWITCH PROGRAM
Pressing FX LOOP (4) switches the parallel FX mode. It is indicated by a blinking red light. mode (red light ON). Switch the amplifier on (Power switch (1)).
loop ON and OFF in the current channel.
Footswitch program and use Press and hold the desired footswitch. Release the FOOTSWITCH / MIDI PROGRAM
Master Section The JVM range features a new type of fully switch (3), the LED will start to flash.
REVERB Control (7) configurable footswitch. Connection to the While holding the footswitch down, in less than
Alongside the REVERB switch each channel amplifier requires a standard mono 1/4" jack to 3 seconds, press the front panel switch you Send ANY MIDI command using your MIDI
has its own reverb control allowing individual jack cable. Any guitar lead will work and want to map. pedalboard or any other MIDI equipment.
level settings of the effect. practically there should be no limit in its length.
The FX footswitch LED will flicker a couple of The amplifier will detect which channel came in
MASTER 1 / MASTER 2 (5) When the front panel FOOTSWITCH / MIDI times indicating that the switch has been and configure itself to listen to that MIDI channel
These are the master volume controls of the PROGRAM switch is off, the footswitch operates mapped. only. From now on any MIDI preset you had
amplifier. They can be assigned individually to in safe mode and executes the commands the previously stored will be activated only on the
each of the modes as you wish and the master moment the switch is pressed down. From now on the selected footswitch will act new channel regardless of what channel you
selection will be stored in each of the modes. exactly in the same way as if you press the used before, this allows a fast reconfiguration
If you enter the FOOTSWITCH PROGRAM related front panel switch. should there be a MIDI conflict with any other
PRESENCE, RESONANCE (6) mode (LED red) you will be able to program the outboard equipment.
These controls are power amplifier controls and footswitch but nevertheless the footswitch and Switches and presets can be assigned as
only have effect when playing through a speaker the amplifier will remain fully operational with the wished without limitation and in any order If you want to exit the MIDI channel selection
(not in silent recording). They affect how the only difference that the commands will be (again, except the FOOTSWITCH / MIDI without any action press the
power amplifier reacts to the connected executed when releasing the footswitches, as PROGRAM switch). The footswitch configuration FOOTSWITCH / MIDI PROGRAM switch (3)
speakers and how much control the amplifier opposed to the normal mode. is stored in the footswitch itself, not in the while waiting for MIDI data.
has over them. amplifier. Resetting the amplifier will not affect
Each of the individual footswitches has 2 modes the footswitch configuration as well.
Increasing the RESONANCE control of operation: preset storeand switch store.
emphasises the natural speakersʼ resonance for The footswitch can be hot-swapped and
an improved bass response. In the same way, In preset storemode, any of the footswitches synchronises itself with the amplifier after
increasing the PRESENCE control emphasises can be configured to store the current amplifier connection. However it is recommended to
the speakersʼ high frequencies which will be status. The current channel, master, FX and connect the footswitch lead to the footswitch
heard as an improved high frequency response reverb status will be stored and recalled when side first and then connect it to the amplifier.
which adds presence to the sound. the respective footswitch is pressed.
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JVM 2 Ch Owners Manual Book-00089-01 /12/15 inner.qxd:Layout 1 14/12/15 10:08 Page 8
Rear Panel Operation
SERIAL / PARALLEL FX LOOP (12) FOOTSWITCH (15)
The JVM is equipped with a series / parallel FX Connect the supplied footswitch using any
loop. Connect your external FX equipment input standard 1/4" jack mono lead. Using any other
to the JVM SEND jack, and the FX output to the type of footswitch rather than the supplied will
JVM RETURN jack. As described previously, have no effect and will be ignored by the
H this effects loop can be bypassed from the front amplifier.
S panel and the amount of effect can be dialed in
I with the MIX control. MIDI In / Through (16)
L
Connect any external MIDI equipment to the
G
The +4dBu/-10dBV switch allows you to MIDI In DIN socket. A copy of the signal in this
N
configure the loop for its use with either connector will be available on the MIDI thru
E
professional equipment (+4dBu setting) or with socket to allow daisy chaining of MIDI
guitar level effects like effects pedals (-10dBV equipment. Note that the JVM only accepts
setting). incoming data and it is not able to send any
MIDI commands.
When MIX is set to WET all the signal goes
through the external loop, adding more direct SPEAKER Outputs (11)
(unprocessed) signal as you turn it towards There are 5 speaker outputs available on the
DRY. This allows you to mix any amount of the rear panel. They are labelled according to the
external effect without loosing or degrading the intended impedances:
direct signal quality.
16 Ohm: connect any 16 Ohms guitar cabinet to
When mixing the WET and DRY signals the this jack.
external effects processorsʼ output should be
configured to remove the direct (unprocessed) 8 Ohm: connect a single 8 Ohms guitar cabinet
signal or unpleasant phasing effects may occur or two 16 Ohms guitar cabinets.
when mixing it again in the amplifier. If the
amplifier sounds thin after connecting an 4 Ohm: connect a single 4 Ohms guitar cabinet
external effect check that no direct signal is or two 8 Ohms guitar cabinets.
being returned from the processorsʼ output.
WARNING:Although the JVM amplifier has 5
Note that if the FX loop is ON and the MIX speaker outputs, never attempt to connect more
control is set to WET without an external speakers than rated. The safe combinations are
processor connected, the amplifier will be 1x16 Ohm, 1x8 Ohm, 1x4 Ohm, 2x16 Ohm or
muted. 2x8 Ohm. Any other speaker configuration may
stress the power amplifier section and in
POWER AMP INSERT / SERIAL LOOP (13) extreme cases may lead to valve and/or output
This is a passive loop connected right before the transformer failure.
master controls. It is a line level loop so it is
recommended to only use high headroom HINTS & TIPS
devices to avoid signal degradation. Plugging Factory Reset
only into the return jack allows the use of the This will erase all the MIDI presets and set MIDI
JVMsʼ power section overriding the preamp. reception channel to #1. Please note that once
the memory is erased it cannot be recovered.
Master controls and the emulated line out are
located after the serial loop so it is still possible Switch the amplifier off (power switch off, not
to take advantage of those features when using standby switch).
an external preamplifier. The loop can be taken
off the circuit by pressing the BYPASS switch, Press and hold CLEAN/CRUNCH CHANNEL
but as opposed to the Series / Parallel loop this switch.
switch cannot be programmed.
Switch the amplifier on (power switch on, not
EMULATED LINE OUT (14) standby switch).
The pre master volume signal, processed
through a 4x12 speaker cabinet emulator and The 2 channel LEDs will glow red.
electronically balanced is made available at this
connector. Release the switch.
8