Yamaha VR-4000 User manual

УАМАНА
GUITAR AMPLIFIER |
__ AMPLIFICATEUR DE GUI n
С GUITAR AMPLIFIER. B 1
AMPLIFICATEUR DE GUITARE |

@ INTRODUCTION
Congratulations!
You
are
now
the
proud
owner
of
a
Yamaha
VR4000/VR6000
Stereo
Guitar
Amplifier.
Your
VR4000/VR6000
represents
ап
exciting
new
concept
in
guitar
amplifier
design
which
provides
vastly
extended
performance
and
creative
potential
in
all
areas.
In
addition
to
extraordinary
flexibility
and
superior
sound,
it
offers
a
broad
range
of
control
features and
outstanding
reliability.
In
order
to
obtain
maximum
performance
from your
VR4000/VR6000,
we
urge
you
to
read
this
operation
manual
thoroughly,
and
keep
it in a safe place for later reference.
€ MAIN FEATURES
* 2-спаппе! 2-mode Configuration
From the input jacks to speakers, the VR4000 and VR6000 feature an
independent 2-channel circuit configuration which allows the "A" and
"B" channels to function essentially as two separate amplifiers. In addi-
tion to this you have a choice of “A ог B" or "А and B" modes, selected
by a single switch. In the "A or B" mode the two channels function
separately and independent settings can be made for each, while in the
"A and B" mode the channels are "coupled" and operate together.
ж Compatible with Stereo Sources
Guitars with stereo outputs or separate guitars can be connected to the
amplifier's two channels, and each channel can be independently set to
create the desired sound.
* Separate Channel Control Configurations
The "A" and "B" channels have slightly different control configurations:
the "A" channel has a single volume control allowing production of
clean, pure tones, while the "B" channel has both gain and volume con-
trols for a broad range of distortion effects. Both channels feature
three-band tone controls as well as "bright" and "fat" switches for ex-
tended tonal versatility.
ж Parametric Equalizers
Both channels feature versatile parametric equalizers that let you pre-
cisely pinpoint and boost or cut specific frequencies for uncompromis-
ing response control accuracy. The VR6000 offers extra control with
twin parametric equalizers.
Ж Reverb & Stereo Chorus
Top-quality reverb and stereo chorus effects are built-in. In particular,
the stereo chorus effect employs both normal and reverse-phase cho-
rus signals to produce an exceptionally fine chorus sound.
* Newly-developed Large-diameter Speakers
These speakers were developed specially for the VR4000 and VR6000,
featuring aluminum center-caps and large-diameter cones they deliver
powerful, clean sound from the heaviest lows to the most sparkling
highs.
* Dual Effect Loóps
The VR4000 and VR6000 have dual effect loops for compatibility with a
wide range of external signal processing equipment. The first loop is
located prior to the chorus circuit and is compatible with 1-in/2-out type
effect units. The second is located after the chorus circuit and offers 2-
in/2-out compatibility.
* Stereo Outputs & Stereo Headphones Jack
Both the line output jacks and headphone output jack offer full stereo
output.
* Footswitch Jack
An optional VFC-3 Footswitch connected to this jack can be used to
switch between the "A" and "B" channels in the “A or B" mode, switch
the reverb effect ON or OFF, and switch the chorus effect ON or OFF.

@ CONTENTS
Precautions «css eere] а ee Ree OUR HUE EO aes 2
Control. Panel с... REEL e Rey EE rS 3
Rear Páriel корса МЕИ essem RU ULT ipid. 5
Connecting Instruments ................................ 6
System Example ...................................... 7
Control Setting Examples ............................... 7
Specifications 2 Fe Lec ee жала ч ваа А 9
Block Diagram ... 1.0... eneore cece tee tenes 10
@ PRECAUTIONS
Ф Avoid setting up your amplifier in the following locations to prevent
possible damage:
* In direct sunlight or next to heating equipment.
* Extremely cold locations.
* Locations exposed to high humidity or excessive dust.
* Locations subject to strong shocks or vibration.
€ In order to prevent damage to the speakers when plugging in connect-
ing cables or turning the power ON/OFF, be sure to set the volume
controls to their minimum settings.
* Make sure your amplifier is rated for the AC mains voltage in your area.
Voltage ratings are given to the left of the rear panel. (General model
only)
€ if the fuse needs replacement, replace only with a fuse of the same
type and power rating.
* The rear panel AC power outlet can provide a maximum of 250 watts of
power. The total power rating of equipment connected to this outlet
must be less than 250 watts. (For U.S. & Canadian models)
€ Your Yamaha guitar amplifier is a precision musical instrument. Handle
it with care and avoid dropping or bumping it.
Ф For safety, always remove the power plug from the AC wall outlet if
there is any danger of lightning striking in your area.
€ Keep the amplifier away from neon signs of fluorescent lighting to pre-
vent noise pickup.
€ To prevent damage and possibly electrical shock, never open the case
and tamper with the internal circuitry.

Ф CONTROL PANEL
* VR4000
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• VR6000
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CHANNEL
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@ POWER Switch
Press once to tum power ON, a second time to turn
power OFF.
@ CHANNEL SELECT Switch
This
switch
functions
only
when
the
VR4000/
VR6000
is
set
to
the
"A
or
B"
mode
(see
CHANNEL
MODE
switch
on
rear
panel).
When
the
CHANNEL
SELECT
switch
is
in
the
Ж
position,
channel
A
is
selected
and
only
channel
А
will
function.
When
the
CHANNEL
SELECT
switch
is in
the
„ma.
position,
Channel
B
is
selected
and
only
channel
B
will
func-
tion.
The
A
CHANNEL
indicator
@
ог
B
CHANNEL
indicator
@
will
light
according
to
the
selected
chan-
nel.
* Refer to the “CONNECTING INSTRUMENTS”
section on page 6.
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* An optional footswitch connected to the FOOT SW
jack Ф can also be used to switch between channel
А and channel B. The front-pane! CHANNEL SE-
LECT switch becomes inoperative when the
footswitch is used.
© INPUT Jacks
These jacks accept output from electric guitars. See
“CONNECTING INSTRUMENTS’ on page 6 for de-
tails.
@ A CHANNEL Indicator
© B CHANNEL Indicator
These indicators show which if the two amplifier
channels is currently operating. Tho A CHANNEL in-
dicator lights when the A channel is active, and the B
CHANNEL indicator lights when the B channel is
active.
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Ф
Ө GAIN Control (with puLL BOOST Switch)
The
GAIN
control
is
provided
only
on the
B
channel,
andis
used
to
adjust
the
amount
of
distortion
applied
to
the
sound
of
this
channel.
As
the
GAIN
control
is
rotated
clockwise
toward
the
"10"
end
of
the
scale,
the
B-channel
gain
increases
causing
an
increase
in
volume
and
distortion.
Pulling
the
GAIN
switch
out
towards
you
activates
the
BOOST
function,
applying
even
greater
distortion
to
the
В-сһаппе!
sound.
The
overall
volume
and
distortion
level
achieved
de-
pends
on
the
settings
of
both
the
GAIN
control
and
B-
channel
VOLUME
control.
Generally,
it
is
best
to
use
the
GAIN
control
first
to
set
the
desired
degree
of
distortion,
then
use
the
VOLUME
control
to
set
the
desired
volume
level.
*
If
the
GAIN
control
is
set
to
"0,"
no
sound
will
be
output from the B channel.

€ VOLUME Control (with PuLL FAT Switch)
This control sets the overall volume level of the
corresponding channel. Pulling the VOLUME con-
trol out towards you activates the FAT function,
boosting the midrange frequencies for a full, "fat"
sound.
© TREBLE Control (with рип. BRIGHT Switch)
Adjusts the level of the high-frequency range. If
you pull the TREBLE control out towards you the
BRIGHT function is activated, further emphasizing
the high frequencies for a sharp, brilliant sound.
© MIDDLE Control
Adjusts the level of the midrange frequencies.
Ф BASS Control
Adjusts the level of the low frequencies.
* If the TREBLE, MIDDLE and BASS controls are
Set to their center "5" positions, a fairly flat,
"normal" sound is produced. If the TREBLE,
MIDDLE and BASS controls are all set to their
minimum “0” positions, no sound will be output.
ФР. EQ FREQ Control
The P. EQ FREQ control sets the center frequency
of a range of frequencies to be boosted or cut
using the P. EQ LEVEL control .
The VR4000 P. EQ FREQ control covers а fre-
quency range from 100 Hz to 5 kHz.
The VR6000 has twin parametric equalizers which
cover different frequency ranges, permitting two-
point equalization. The P. EQ 1 FREQ control ad-
justs the EQ center frequency from 100 Hz to 1
kHz, and the P. EQ 2 FREQ control adjusts from
800 Hz to 5 kHz.
ФР. EQ LEVEL Control
The P. EQ LEVEL control permits applying a maxi-
mum of 15 dB boost or cut at the center frequency
set using the corresponding P. EQ FREQ control
Ф. If no equalization is required, set the LEVEL
control to its center “0” position.
Ф REVERB Control
This control adjusts the amount of reverb effect
applied to both the A and B channels. If no reverb
is required, set the REVERB control to its mini-
mum "O" position.
* The reverb effect can be switched ON and OFF
using the optional VFC-3 footswitch.
Ф CHORUS Switch
The CHORUS switch turns the internal stereo
Chorus effect ON or OFF for both the A and B
channels.
* The chorus effect can also be switched ON and
OFF using the optional VFC-3 footswitch. When
the footswitch is used, the front-panel CHORUS
switch becomes inoperative.
«P CHORUS SPEED Control
Adjusts the speed of chorus effect variation for
both the A and B channels.
Ф CHORUS DEPTH Control
Adjusts the depth (intensity) of the chorus effect
for both the A and B channels. A slight chorus
effect will remain even if this control is set to its
minimum “O” position. The CHORUS switch Ф
must be turned OFF ( Qi ) to completely cancel
the chorus sound.
Ф PHONES Jack
The PHONES jack accepts any standard pair of
stereo headphones with an impedance rating be-
tween about 8 and 150 ohms. The left headphone
speaker receives the same signal that appears at
the rear-panel LINE OUT L jack, and the right
headphone speaker receives the same signal that
appears at the LINE OUT R jack. Sound is output
from the main speakers even if a pair of head-
phones is plugged into the PHONES jack. If you
require headphone sound only, temporarily re-
move the plugs connected to the rear-panel SP
OUT jacks.
Ф FOOT SW Jack
Accepts the optional VFC-3 Footswitch. When the
VFC-3 is plugged into this jack, it can be used to
switch between the A and B channels, turn the
reverb effect ON and OFF, and turn the chorus
effect ON and OFF.
* Use ONLY the Yamaha VFC-3 Footswitch with
this jack. Other footswitches can damage your
amplifier.

© REAR PANEL
U.S. & Canadian models
SPEAKER QUT
MAUT-PAUREURS
IT
VR6000
General
model
ТАМНА
onore
fame Ol
VR6000
Q9 CHANNEL MODE Switch
The CHANNEL MODE switch selects the amplifi-
ers operational mode: “A or B" for selectable op-
eration of either the A channel or B channel alone,
or "A/B" for simultaneous operation of both the A
and B channels. Always turn the amplifier's
POWER switch OFF when changing the setting of
this switch.
* Refer to "CONNECTING INSTRUMENTS" оп
page 6 for more information.
SP OUT Jacks
Normally, the amplifier's internal L and R speakers
are connected to these jacks. It is possible, how-
ever, to unplug the internal speakers and connect
external speakers to these jacks. In this case,
make sure the system impedance of each external
speaker connected to the SP OUT jacks is 8
ohms, and that the speakers can handle the full
power output of the amplifier.
LINE OUT Jacks
These jacks deliver a line-level output signal from
the left and right channels of the amplifier for con-
nection to a mixing console, an external power
amplifier system or other line-level equipment. The
signal delivered to these jacks is the same as that
delivered to the internal L and R speakers. The
effect of the internal chorus system or external
stereo signal processors is delivered to these
jacks in full stereo.
The tate output level of the LINE OUT jacks is
Voltage Selector
(General model only)
© MONO SND — ST RTN LOOP Jacks
These jacks are ideally suited for connection to an
external signal processor with a single input and
stereo outputs. The SEND MONO jack should be
connected to the input of the external signal proc-
essor, and the stereo outputs from the signal proc-
essor should be connected to the L and R RTN
jacks. When the outputs from the signal processor
are plugged into the amplifiers RTN jacks, the
signal processor is effectively inserted into the
amplifier's signal path.
Rated input and output level for these jacks is +4
dB.
ST SEND — ST RTN LOOP Jacks
These jacks are suited for connection to an exter-
nal signal processor with stereo inputs and out-
puts. The SEND L and R jacks should be con-
nected to the inputs of the external signal proces-
sor, and the stereo outputs from the signal proces-
sor should be connected to the | and R RTN
jacks. When the outputs from the signal processor
are plugged into the amplifiers RTN jacks, the
signal processor is effectively inserted into the
amplifier's signal path.
Rated input and output level for these jacks is +4
dB.
* The circuit positions of the effect loops in relation
to the amplifier's internal effect processors are as
shown below. Refer to the "BLOCK DIAGRAM"
on page 10 for more details.
ineo
External External | ER
Input «processor +| Internal chorus | 4processor + Internal reverb | +
connected to) (connected юФ| !
Interna! геуего
Ф AC OUTLET (UNSWITCHED) (U.S. & Canadian
models only)
Other equipment with a total power consumption
of no more than 250 watts can be powered from
this AC outlet.
9 FUSE
If the fuse blows and needs replacing, first unplug
the AC power cord and then replace the fuse with
a new one of exactly the same type and power rat-
ing.
If the fuse blows again immediately after replace-
ment, there may be a fault in the amplifier's cir-
cuitry. If this happens, have the amplifier checked
by qualified Yamaha service personnel.
Ө GROUND Switch (U.S. & Canadian models only)
This switch reverses the ground polarity of the AC
power line. Set it to the position in which you hear
the least hum and noise from the amplifier.

€ CONNECTING INSTRUMENTS
The type of guitar you use and the way you intent to use the A and B channels will determine how
you connect your instrument and set the channel-related switches. The following connection ex-
amples should help you decide on the setup that's right for you.
* A MONO-OUTPUT GUITAR VIA EITHER THE A OR B CHANNEL * STEREO-OUTPUT GUITAR WITH EACH OUTPUT FEEDING A
* GUITAR: Connect to the "A or B" INPUT jack. SEPARATE CHANNEL
* CHANNEL MODE SWITCH: Set to "A or B" (switch on rear panel). * GUITAR: Connect the stereo outputs to the "A" and "B" INPUT jacks.
* CHANNEL SELECT SWITCH: Use to select the A or B channel as * CHANNEL MODE SWITCH: Set to "A/B" (switch on rear panel).
required. * CHANNEL SELECT SWITCH: Not used.
ў
А
CHANNEL
A
CHANNEL
B CHANNEL
О
B CHANNEL
* TWO MONO GUITARS FEEDING SEPARATE CHANNELS
* GUITARS: Connect to the "A" and "B" INPUT jacks.
* A MONO-OUTPUT GUITAR VIA BOTH THE A AND B CHANNELS * CHANNEL MODE SWITCH: Set to "A/B" (switch on rear panel).
*
GUITAR:
Connect
to
the
"A
or
B"
INPUT
jack.
•
CHANNEL
SELECT
SWITCH:
Not
used.
*
CHANNEL
MODE
SWITCH:
Set
to
"A/B"
(switch
on
rear
panel).
* CHANNEL SELECT SWITCH: Not used.
CHANNEL | д
SELECT 9
A
CHANNEL
B
CHANNEL

Ф SYSTEM EXAMPLE
See "CONNECTING INSTRUMENTS" on
the previous page for input connections.
To the front-panel
FOOT SW jack.
VFC-3 Footswitch.
Power
or mixing console.
€ CONTROL SETTING EXAMPLES
1. METAL SOUND
This setting produces a very punchy
distortion sound. For a crisp attack
turn the CHORUS effect ON, or turn
CHORUS OFF for smoother effect.
External signal processor
(mono-in/stereo-out type).
Refer to "CONNECTING
INSTRUMENTS" on the
previous page.
INPUT
РЕ To the internal speakers
or external speaker
amp/speaker system
(stereo-in/stereo-out type).
PULL BOOST ON PULL BRIGHT OFF
Set rear-pane! CHANNEL MODE switch to "A or B"
Use the "A or В" or "В" INPUT jack > Set as required.
Set as required. | Set as required.
PULL BOOST ON PULL BRIGHT OFF
"а. B Set rear-panel CHANNEL MODE switch to "A or В“
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паезззввавевэввввававввввнааа — 7102 пнавовювоерививнв|оввевевевиававевва. ;—
Use the "A or В“ or "B* INPUT jack
Set as required.
Set as required. Set as required.

2. ROCK 'N ROLL
This setting makes use of the A/B
mode. A well-defined, crisp sound is
produced by the A channel, while the
B channel is used to add fullness and
a touch of distortion. The mix of the
two channels results in a rich, vibrant
sound. Try adding chorus for more
depth.
3. ELECTRIC ACOUSTIC GUITAR
This setting can make an electric gui-
tar sound more like an electric acoustic
guitar. The A channel provides bril-
liance, while Ше B channel adds
depth. Turning the chorus effect ON
adds extra breadth to the sound. This
sound works beautifully with broken
chords and arpeggios.
PULL BOOST ON
PULL BRIGHT ON
PULL, FAT ON PULL BRIGHT ON
Set rear-panel CHANNEL MODE switch to "А/В"
PULL BRIGHT ON
PULL FAT ON PULL BRIGHT ON
PULL
Set rear-panel CHANNEL MODE switch to "А/В"
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PULL BRIGHT OFF
PULL BOOST OFF
PULL
PULL FAT ON PULL BRIGHT ON
Set rear-panel CHANNEL MODE switch to "A/B*
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ON
PULL BOOST OFF PULL BRIGHT OFF
PULL
PULL FATON PULL BRIGHT ON FAT OFF
Set rear-panel CHANNEL MODE switch to "А/В"

@ SPECIFICATIONS
Rated Output | 25W + 25W rms 50W + 50W rms
(80, 10% THD) (8Q, 10% THD)
бот (80) | soemo)
Open-backed enclosure
Input Sensitivity (1 kHz)
INPUT A
-26 dB (VOLUME max.)
-42 dB (GAIN & VOLUME max.)
44 dB (47kQ)
See "Rated Output"
-10 dB (6000)
+4 dB (6000)
100 mW (8Q)
INPUT B
Input Level
EFFECT RTN
Output Level
SP OUT
LINE OUT
EFFECT SEND
PHONES
Noise (IHF-A)
A CHANNEL -42 dB (VOLUME max.)
-67 dB (VOLUME min.)
-21 dB (GAIN /VOL. max., Pull BOOST)
-58 dB (GAIN min., VOLUME max.)
-68 dB (GAIN & VOLUME min.)
+10 dB boost
+10 dB boost at 400 Hz
+15 dB at 5 kHz
(Pull BRIGHT: +12 dB boost)
MIDDLE +10, -5 dB at 800 Hz
BASS +5, -15 dB at 80 Hz
B CHANNEL
Pull BOOST
Pull FAT
Tone Controls
TREBLE
Parametric Equalizer
P. EQ FREQ :
100 Hz — 5 kHz P.EQ 1
100 Hz — 1 kHz
P.EQ2
800 Hz — 5 kHz
+15 dB variable +15 dB variable
Spring reverb, variable
(Stereo Chorus Effect)
0.1Hz —7 Hz
Variable
POWER ON/OFF, CHANNEL MODE,
CHANNEL SELECT, CHORUS ON/OFF,
GROUND
P. EQ LEVEL
Reverb Control
REVERB
Chorus Control
CHORUS SPEED
CHORUS DEPTH
Power Requirements
US & Canadian Models 120V AC, 60 Hz
General. Model 110/120/220/240V AC, 50/60 Hz
Power Consumption
US & Canadian Models 107 W 170 W
General Model 132 W 220 W
Dimensions (W x H x D) 729 x 563 x 275 mm
(28-3/8" x 22-1/8" x 10-7/8")
{Weight
|
22.6
kg
(49.9
tbs.)
|
26
kg
(57.3
bbs.)
* 0dB is referenced to 0.775V RMS.
* Specifications subject to change without notice.