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Owners Guide for the
Owners Guide for the
Bass Amplifier
Bass Amplifier
®
Ampeg
Ampeg® is Proudly Made in America
is Proudly Made in America
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2
Important Safeguards and Precautions:
All Ampeg products are designed for continuous safe operation, as long as common sense is used and steps are taken
to help avoid certain problems. Abiding by the following rules can help prevent damage to your amplifier, yourself and others.
• The amplifier is equipped with a three-pronged AC power cord. To reduce the risk of electrical shock,
NEVER remove or otherwise attempt to defeat the ground pin of the power cord.
• Connect the amplifier ONLY to a properly grounded AC outlet of the proper voltage for your amp.
• Avoid sudden temperature extremes, rain and moisture. Also, avoid sudden and intense impact. (If the unit
has been subjected to any of the preceding abuses, have it looked at by an authorized service center.)
• NEVER set the amplifier on a support that might give out under its weight.
• Always keep the total speaker impedance at or above the rated load.
• Unplug the amplifier before cleaning it. NEVER spray liquid cleaners onto the amplifier. Wipe it with a slight-
ly dampened, lint-free cloth to remove dirt and film.
• Don’t use the amplifier if it has sustained damage to the chassis, controls, or power cord. Refer the unit to
an authorized service center for inspection.
• Amplifiers capable of producing high volume levels are also capable of inflicting permanent hearing loss or
damage, if the exposure to such levels is prolonged. Such damage is progressive and irreversible!
TABLE OF CONTENTS
Important Safeguards and Precautions . . . . . . . . . . . . . . .2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
The Front Panel Controls and Their Use (English) . . . . .4,5
The Front Panel Controls and Their Use (Spanish) . . . . .6,7
The Rear Panel (English) . . . . . . . . . . . . . . . . . . . . . . . .8,9
The Rear Panel (Spanish) . . . . . . . . . . . . . . . . . . . . . .10,11
Connections: Mono Bridged . . . . . . . . . . . . . . . . . . . . .12
Dual Mono . . . . . . . . . . . . . . . . . . . . . . . .12
Stereo . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Biamp, Full Range and Lows . . . . . . . . . .13
Biamp, Highs and Lows . . . . . . . . . . . . . .13
Biamp With Secondary Amplifier . . . . . . . .13
Some Suggested Settings . . . . . . . . . . . . . . . . . . . . . . . .14
Rack Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . .15
Technical Specifications . . . . . . . . . . . . . . . . . . .back cover
SVT-4 PRO Bass Amplifier
IMPORTANT SAFETY INSTRUCTIONS
• READ, FOLLOW, HEED, AND KEEPALLINSTRUCTIONS AND WARNINGS.
• DO NOT OPERATE NEAR ANY HEAT SOURCE AND DO NOT BLOCK ANY VENTILATION OPENINGS ON THIS APPARATUS. FOR PROPER OPERATION, THIS UNIT REQUIRES 3”
(75CM) OF WELL VENTILATED SPACE AROUND HEATSINKS AND OTHER AIR FLOW PROVISIONS IN THE CABINET.
• DO NOT USE THIS APPARATUS NEAR SPLASHING, FALLING, SPRAYING, OR STANDING LIQUIDS.
• CLEAN ONLY WITH LINT-FREE DAMP CLOTH AND DO NOT USE CLEANING AGENTS.
• ONLY CONNECT POWER CORD TO A POLARIZED, SAFETY GROUNDED OUTLET WIRED TO CURRENT ELECTRICAL CODES AND COMPATIBLE WITH VOLTAGE, POWER, AND
FREQUENCY REQUIREMENTS STATED ON THE REAR PANEL OF THE APPARATUS.
• PROTECT THE POWER CORD FROM DAMAGE DUE TO BEING WALKED ON, PINCHED, OR STRAINED.
• UNPLUG THE APPARATUS DURING LIGHTNING STORMS OR WHEN UNUSED FOR LONG PERIODS OF TIME.
• ONLY USE ATTACHMENTS, ACCESSORIES, STANDS, OR BRACKETS SPECIFIED BY THE MANUFACTURER FOR SAFE OPERATION AND TO AVOID INJURY.
• WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK OR FIRE, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.
• SERVICE MUST BE PERFORMED BY QUALIFIED PERSONNEL.
• OUR AMPLIFIERS ARE CAPABLE OF PRODUCING HIGH SOUND PRESSURE LEVELS. CONTINUED EXPOSURE TO HIGH SOUND PRESSURE LEVELS CAN CAUSE PERMA-
NENT HEARING IMPAIRMENT OR LOSS. USER CAUTION IS ADVISED AND EAR PROTECTION IS RECOMMENDED IF UNIT IS OPERATED AT HIGH VOLUME.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE
THIS APPARATUS TO RAIN OR MOISTURE. TO REDUCE THE RISK OF ELECTRIC
SHOCK, DO NOT REMOVE COVER. NO USER-SERVICEABLE PARTS INSIDE. REFER
SERVICING TO QUALIFIED SERVICE PERSONNEL.
PRECAUCION
RIESGO DE CORRIENTAZO
NO ABRA
PRECAUCION: PARA REDUCIR EL RIESGO DE INCENDIOS O DESCARGAS ELECTRICAS, NO PER-
MITA QUE ESTE APARATO QUEDE EXPUESTO A LA LLUVIA O LA HUMEDAD. PARA DISMINUOIR EL
RIESGO DE CORRIENTAZO. NO ABRA LA CUBIERTA. NO HAY PIEZAS ADENTRO QUE EL USARIO
PUEDO REPARAR DEJE TODO MANTENIMIENTO A LOS TECHNICOS CALIFICADOS.
ATTENTION
RISQUE D'ELECTROCUTION
NE PAS OUVRIR
ATTENTION: PROTÉGEZ CET APPAREIL DE LA PLUIE ET DE L'HUMIDITÉ AFIN D'ÉVITER TOUT
RISQUE D'INCENDIE OU D'ÉLECTROCUTION. POUR REDUIRE D'ELECTROCUTION NE PAS ENLEVER
LE COUVERCLE. AUCUNE PIECE INTERNE N'EST REPRABLE PAR L'UTILISATEUR. POUR TOUTE
REPARATION, S'ADRESSER A UN TECHNICIEN QUALIFIE.
"IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL"
“ES NECESARIO QUE EL USUARIO SE REFIERA AL MANUAL DE INSTRUCCIONES.”
"REFERREZ-VOUS AU MANUAL D'UTILISATION"
EXPLANATION OF GRAPHICAL SYMBOLS:
EXPLICACION DE SIMBOLOS GRAFICOS:
EXPLICATION DES SYMBÔLESGRAPHIQUES:
"DANGEROUS VOLTAGE"
“VOLTAJE PELIGROSO”
"DANGER HAUTE TENSION"
=
=
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An Introduction to your new Ampeg SVT-4 PRO Bass Amplifier
The harmonically rich sound and legendary performance of the AMPEG SVT are redefined in the SVT-4
PRO. This versatile and powerful bass amplifier delivers up to 1600 watts of unsurpassed musical power,
and offers the classic vibrancy of tubes with several outstanding features.
All of the features and controls of your SVT-4 PRO are covered in detail within the pages of this owner’s
guide. We recommend that you go over them before you use the amplifier.
Features
In the world of high performance bass amps, Ampeg’s SVT amplifiers stand alone. In true Ampeg tradition, the SVT-4 PRO offers you more power, performance and flexibility than any other bass amplifier in its
class. Below are some of the outstanding features of your new amplifier - features which set it apart from
the competition!
• DUAL SEPARATE POWER AMPLIFIERS: Operate in true stereo or mono bridged
mode for even greater output power (page 8,12)
• BIAMP CAPABLE: Adjustable crossover frequency control and low-to-high fre-
quency balance control allow you to fine tune the biamp abilities of the amplifier
(page 5,13)
• 5-POSITION MIDRANGE SELECTOR: Take your pick from the five center fre-
quency points available to get just the right midrange voice (page 4)
• COMPRESSION CONTROL: Allows you to control the dynamics of the tonal
response characteristics from the power amp, from punchy to compressed (page 4)
• 9-BAND GRAPHIC EQ: Use as a “second channel” for bass solos, or to shape your
sound to your own exacting standards - an independent level control lets you adjust
the Graphic EQ volume - switchable at front panel or with a footswitch (page 5).
• TUNER OUT JACKS: Two jacks, one on the front panel, one on the rear panel -
allows connection to an electronic tuner and provides an “always live” monitor feed
even when the output is muted (page 4,9)
• SPEAKON
®
JACKS: For more reliable connections at higher outputs and for mono
bridged connections (in addition to 1/4” speaker out jacks) (page 8)
• TRANSFORMER BALANCED LINE OUTPUTS: Independent level control - two
transformer balanced XLR and two balanced/unbalanced 1/4” output jacks - switchable stereo or mono (one “wet,” one “dry” signal), pre- or post-EQ (page 8,9)
• STEREO EFFECTS LOOP: Connect your effects here for increased intensity and
quieter operation (page 9) - can be bypassed with front panel switch or footswitch.
• POWER AMP IN/PREAMP OUT:Two separate loops, one for each channel: a sep-
arate preamp may be connected to the Power Amp In jack, and the Preamp Out
jack may be connected to a slave amp (page 8)
• FOOTSWITCH CONTROL: Use a footswitch to bypass the Effects Loop, and to
activate the Graphic EQ and the Mute feature (page 8)
• CIRCUIT BREAKER PROTECTION: A heavy duty resettable circuit breaker pro-
vides protection against fault conditions (page 8)
Speakon®is a registered trademark of Neutrik AG.
SVT-4 PRO Bass Amplifier
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The Front Panel Controls and Their Use
SVT-4 PRO Bass Amplifier
1. INPUT: Connect your bass guitar here using a shielded
instrument cable.
2. TUNER OUT: This jack is provided for connection to an
electronic tuner and is always “live,” even when the Mute
switch (#3) is engaged. This allows for “silent tuning” as well
as providing a monitor feed which stays hot even when the
house mix is muted. In addition, this jack may also be used
as a -6dB input (when not connected to a tuner).
3. MUTE: This switch, when depressed, mutes all outputs
except the Tuner Outs. This is excellent for tuning your bass
with an electric tuner without having to adjust any levels to
turn down your house volume. Afootswitch can also be used
to control muting as long as the Mute switch on the front
panel is left in the “out” position. (The front panel switch is still
active with the footswitch connected. Please refer to #38, rear
panel.)
4. -15dB: This switch, when depressed, will attenuate the
input signal by 15dB. If your bass has active pickups, depress
this switch to better accommodate its output signal level.
5. GAIN: This controls the gain of the preamp. Adjust this
control until the Peak LED (#6) flashes on strong signal peaks
(but is not illuminated constantly while playing). To obtain the
best signal to noise ratio, set the Gain control to the highest
possible setting and adjust the Master (#19) to obtain the
desired volume level.
6. PEAK LED: This LED will illuminate when the preamp signal is nearing its clipping level, indicating optimum gain setting.
7. COMPRESSION: This controls the amount of signal compression. At the fully counter clockwise position there is no
compression; at fully clockwise the compression ratio is 10:1.
The sonic effect of compression is reduced dynamics,
increase sustain and a more consistent output level regardless of how light or hard the strings are played. The compressor is very transparent – that is, there is very little effect
on the tone of your instrument.
8. UL TRA HIGH: This switch, when depressed, increases the
high frequency output by 6dB at 5kHz.
9. ULTRA LOW: This switch, when depressed, greatly
enhances the amount of low-end bass tones which you can
feel and hear, especially the low E and low B strings (5-string
basses).
10. BASS: This control allows for 12dB of cut or boost at
50Hz. The low frequency output is flat at the center position.
11. MIDRANGE: This control allows for 15dB of cut or boost
at the center frequency selected by the Frequency control
(see #12). The midrange output is flat at the center position.
12. FREQUENCY: This control allows you to select the center frequency for the midrange control (#11), giving you a
choice of five “voices” for the midrange. The numbers correspond to the following center frequencies as indicated:
1=220Hz, 2=450Hz, 3=800Hz, 4=1.6kHz, 5=3kHz.
13. TREBLE: This control allows for 19dB of cut or 14dB of
boost at 5kHz. The high frequency output is flat at the center
position.
14. BRIGHT: This switch, when depressed, adds a more lively top end response to the input signal.
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SVT-4 PRO Bass Amplifier
15. GRAPHIC EQ: This switch, when depressed, enables the
9-band Graphic EQ (see #23 and 24). The sound of your
bass will only be affected by the settings of the EQ slider controls when this switch is depressed, or when a footswitch is
pressed. (A footswitch will override the front panel switch.
Please refer to #38, rear panel.)
16. LINE OUT LEVEL: This controls the strength of the signal at the Line Out jacks (#40,41,44,45, rear panel).
17. EFFECTS BYPASS: This switch, when depressed,
bypasses the Effects Loop. (A footswitch will override the front
panel switch. Please refer to #38, rear panel.)
18. LIMIT DEFEAT: The SVT-4 PRO employs internal limiter
circuits to help keep the power amplifier’s output clean at
extreme volume levels. (All amplifiers may begin to clip their
output signals as they approach maximum output levels,
resulting in potentially speaker-damaging distortion.) These
circuits may be defeated by depressing this switch, which
may result in an increase in output power but with the possibility of distortion. Use discretion whenever playing with the
Limit circuits defeated.
19. MASTER: This controls the overall output level of the
amplifier. For the best results, adjust the Gain control as
directed (see #5) and use this control to obtain the desired
volume level.
20. LIMIT LED: This LED will flash any time the internal limit
circuit is called upon to keep the amplifier’s output signal
clean. This indicates that the amplifier is nearing full output
and the limiter is keeping it from clipping the output signal.
21. CROSSOVER FREQUENCY: This sets the crossover
point between the Biamp High and Biamp Low Outputs when
using the amplifier in the biamp mode. (See page 13.)
22. CROSSOVER BALANCE: This adjusts the relative level
between the low and high frequency biamp signals when
using the amplifier in the biamp mode.
23. 9-BAND GRAPHIC EQ: These sliders control the amplitude of the signal at the frequency indicated below each control. The center position of each control is flat: sliding the control upward will increase the output signal level of that frequency; sliding the control downward will decrease it.
The Graphic EQ can be used in two ways: 1) To fine tune your
sound, make small adjustments at the desired frequencies and
leave the EQ on throughout the entire session. (This is great for
adapting to varying room acoustics when going from club to club,
etc.) 2) For a completely different sound, make larger adjustments
and only activate the EQ when you want a “second channel” sound
(such as during bass solos).
24. LEVEL: This is the output volume control for the Graphic
EQ and only affects the signal when the EQ is engaged. If the
EQ’d signal is too soft, slide the Level control up; if it’s too
loud, slide the control down.
25.POWER LED: This LED illuminates green when the
Power switch (#27) is depressed.
26. ACTIVE LED: This LED illuminates when the Graphic EQ
switch (#15) is depressed.
27.POWER: This heavy-duty rocker switch applies AC power
to the amplifier: the amp is ON when the top of the switch is
depressed, OFF when the bottom of the switch is depressed.
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The Front Panel Controls and Their Use – SPANISH TRANSLATIONS
SVT-4 PRO Bass Amplifier
1. ENTRADA: Conecte aquí su guitarra de bajos utilizando un
cable blindado para instrumentos.
2. SALIDA DEL SINTONIZADOR: Se provee este “jack” para
conectado a un sintonizador electrónico y siempre se encuentra “vivo”, aún cuando se utilice el interruptor Mudo (#3), lo que
permite “sintoniar en silencio” lo mismo que una alimentación
monitor que se mantiene caliente aún cuando la mezcla de la
casa se encuentre muda. (Este “jack” también se puede usar
como entrada de –6dB cuando no se encuentre conectado a
un sintonizador.)
3. MUDO: Use este interruptor para silenciar todas las salidas
excepto las Salidas del Sintonizador. El interruptor de pie también puede controlar el silencio, si el interruptor de Mudo en el
tablero delantero se deja en la posición de “salida”. (El interruptor del tablero delantero aún sigue activo cuando el interruptor de pie está conectado. Esto es excelente para sintonizar
su bajo con un sintonizador eléctrico sin tener que ajustar
ningún nivel para disminuir el volumen de su casa.)
4. -15dB: Este interruptor, cuando se encuentre ADENTRO,
atenuará en 15dB la señal de entrada. Si su bajo tiene circuitos
electrónicos activos, usted tal vez quiera usar este interruptor.
5. GANANCIA: Esto controla la ganancia del preamplificador.
Ajuste el control hasta el diodo LED de picos (#6) se iluminé
con un señal de fuersa. Para óbtener la mejor relación de señal
a ruido, ponga el control de Ganancia a su posición más alta
posible y ajuste el Maestro (#19) al nivel de volumen deseado.
6. DIODO LED DE PICOS: Este LED se iluminará cuando el
señal de preamplificación esté cerca del nivel de aplanamiento "clipping", lo que indicaría una posición de ganancia óptima.
7. COMPRESION: Esto controla la cantidad de compresión
de señal. En la posición totalmente contraria a las manecillas
del reloj no hay compresión; totalmente a favor de las manecillas del reloj la relación de compresión es de 10:1. El efecto
sónico de la compresión es de dinámica reducida, sosten-
imiento incrementado y un nivel de salida más constante sin
importar lo ligera o fuertemente que se toquen las cuerdas. El
compresor es muy transparente – es decir que tiene muy poco
efecto en el tono de su instrumento.
8. ULTRA AGUDOS: Cuando se oprime hacia ADENTRO,
este interruptor realza la cantidad de la salida de frecuencias
altas en 6dB a 5kHz.
9. ULTRAGRAVES:Al oprimirse este interruptor hacia ADENTRO, se realza en gran forma la cantidad de tonos bajos de la
parte grave que usted puede sentir y oír, en especial de las
cuerdas de E bajo y B bajo (en un bajo de 5 cuerdas).
10. BAJOS: Es el control primordial para las frecuencias
bajas. Permite 12dB de recorte (totalmente a la izquierda) ó
refuerzo (totalmente a la derecha) a 50Hz. La salida de frecuencias graves queda plana en la posición central.
11. RANGO MEDIANO: Es el control primordial en el rango
mediano. Permite 15dB de recorte (totalmente a la izquierda)
ó refuerzo (totalmente a la derecha) a la frecuencia central que
se haya seleccionado en el control de Frecuencias (véase
#12). La salida del rango mediano está plana en la posición
central.
12. FRECUENCIA: Le permite seleccionar la frecuencia central para el control del rango mediano, lo que le da la opción de
cinco "voces" para el rango mediano. Las frecuencias correspondientes son: 1=220Hz, 2=450Hz, 3=800Hz, 4=1.6kHz,
5=3kHz.
13. AGUDOS: Es el control primordial para las frecuencias
altas. Permite 19dB de recorte (totalmente a la izquierda) ó
14dB de refuerzo (totalmente a la derecha) a 5kHz. La salida
de frecuencias altas es plana en la posición central.
14. BRILLANTE: Este interruptor, cuando se encuentre
ADENTRO, añade a la señal de entrada una respuesta más
viva en la parte alta. Usted puede experimentar el uso de diferentes posiciones del EQ con este interruptor.
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SVT-4 PRO Bass Amplifier
15. EQ GRAFICO: Este interruptor habilita al EQ Gráfico de 9
bandas (véase #23 & #24). El sonido de su bajo sólo se verá
afectado por los ajustes en los controles deslizantes (cursores)
del EQ cuando este interruptor se encuentre hacia ADENTRO
ó se haya oprimido el interruptor de pie. El control del interruptor de pie anula al (tiene preferencia sobre el) interruptor del
panel delantero.
16. NIVEL DE LALBEA AFLIERA: Esto controla la fuerza de
la señal en los “jacks” de Línea Afuera (#40,41,44,45).
17. DERIVACION PARA EFECTOS: Este interruptor, en posición de ADENTRO, pasa alrededor del Circuito de Efectos. El
interruptor de pie pasa por alto este interruptor.
18. INHIBILITADOR DE LIMITE: El SVT-4 PRO utilizes unas
circuitos limitadores internos que ayudan a conservar limpia la
salida del amplificador de potencia en los niveles extremos de
volumen. (Todos los amplificadores pueden empezar a recortar
sus señales de salida conforme se aproximan a los niveles
máximos de salida, resultando una distorsión potencialmente
dañina a las bocinas.) Este circuito se puede inhabilitar oprimiendo este interruptor hacia adentro, lo que puede resultar en
incremento de la potencia de salida, pero con posibilidad de
distorsión. Use discreción cuando toque con el circuito
Limitador desconectado.
19. MAESTRO: Esto controla el nivel general de salida del
amplificador. Para obtener el menor nivel posible de ruido, ponga
el control de Ganancia (#5) en su máxima posición posible y use
este control para obtener el nivel de volumen deseado.
20. DIODO “LED” DE LIMITE: Este LED parpadeará cada vez
que el circuito limitador interno funcione para conservar limpia
la señal de salida del amplificador. Esto indica que el amplificador se acerca a su salida total y el limitador evita que distorsione la señal de salida.
21. FRECUENCIA DE CRUCE: Esto fija el punto de cruce
entre las salidas de Biamplificador Alto y Biamplificador Bajo
cuando se use el amplificador en el modo de biamplificación
(Véase la página 13.)
22. EQUILIBRIO DE CRUCE: Esto ajusta el nivel relativo entre
las señales de frecuencias altas y bajas de biamplificación
cuando se use el amplificador en el modo de biamplificación.
23. EQ GRAFICO DE 9 BANDAS: Estos controles deslizantes
(cursores) le permiten ajustar las frecuencias de salida que se
muestran abajo cada control. La posición central de cada control está plana; el deslizamiento del control hacia arriba incrementará el nivel de salida de aquella frecuencia; el deslizamiento del control hacia abajo lo reducirá.
El EQ Gráfico se puede usar de dos maneras: 1) Para afinar su
sonido, hacer pequeños ajustes en las frecuencias deseadas y dejar
prendido el EQ durante toda la sesión. (Esto es muy bueno para adaptarse a variaciones en la acústica del salón cuando vaya de un club a
otro, etc.); 2) Para conseguir un sonido diferente por completo, hacer
ajustes más grandes y sólo activar el EQ cuando usted quiera un
sonido de "segundo canal" (como por ejemplo durante solos de bajo).
24. NIVEL: Este es el control del volumen de la salida para el
EQ Gráfico y solamente afecta a la señal cuando el EQ se
encuentre activado. Si la señal del EQ está demasiado suave,
deslice el control de Nivel hacia arriba; si está demasiado
fuerte traiga el control hacia abajo.
25. DIODO "LED" DE PRENDIDO: Este LED brillará con un
color verde cuando el interruptor de Energía (#27) se encuentre PRENDIDO.
26. DIODO “LED” ACTIVO: Este se iluminará cuando el EQ
se encuentre prendido.
27. ENERGIA: Este interruptor de servicio pesado tipo vaivén
aplica la energía eléctrica al amplificador; el amplificador se
PRENDE en la posición hacia arriba, y se APAGA en la posición hacia abajo.
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Page 8
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The Rear Panel
SVT-4 PRO Bass Amplifier
(Speakon®is a registered trademark of Neutrik AG.)
28. CIRCUIT BREAKER: The SVT-4 PRO employs an AC
line circuit breaker to help protect against damages due to
excessive current demands. If the amplifier stops working,
check the circuit breaker.
NOTE: When the circuit breaker opens, the button will be
protruding and showing a contrasting color. You can reset the
circuit breaker by pushing it in until it latches. The breaker
must cool down for a short time before the button will latch.
If the circuit breaker opens repeatedly with no signal input,
have the amplifier checked by a qualified service person.
29. AC LINE IN: Firmly insert the supplied AC power cord
into this socket until it is fully seated. Plug the male end of the
cord into a grounded AC outlet. DO NOT DEFEAT THE
GROUND PRONG OF THE AC PLUG!
30. AC OUTLET (Domestic units only): This unswitched
outlet lets you connect any AC powered device (such as an
effects unit or an electronic tuner) up to a maximum of 300
watts. The jack is “hot” whenever the amplifier is plugged into
a live AC outlet, regardless of the setting of the amplifier’s
Power switch.
31. SPEAKER OUTPUTS: The Speakon®Jacks: Use of
these heavy-duty connectors is recommended when playing
at full output levels. Connect the amplifier to your speaker
cabinet(s) using heavy gauge speaker cables terminated
with the appropriate connectors. (See text to left of jacks for
pinout information.)
The 1/4” Jacks: These mono 1/4” jacks (two per channel,
wired in parallel) offer you a convenient method of connecting the amplifier to your speaker(s) using cables terminated
with 1/4” plugs. (Whenever playing at full output levels, it is
recommended that you use the Speakon®jacks).
32. STEREO/MONO BRIDGE SWITCH: This switch sets the
operating mode of the amplifier. In the “out” position the
amplifier is in the Stereo Mode; with the switch in the “in”
position the amplifier is in the Mono Bridged Mode.
33,35. POWER AMP INPUTS: These jacks connect directly
to the internal power amp for use with external preamps.
When using external sources, connect the OUTPUT of the
sources to these jacks using shielded instrument cables to
feed the signals into the power amp sections. The internal
signal is disconnected when a plug is inserted. In the Mono
Mode, Channel A = Input. In the Biamp Mode, Channel A =
Low (frequency) Input, Channel B = High (frequency) Input.
34,36. PREAMP OUTPUTS: These jacks are direct preamp
outputs for use with external power amplifiers, mixing
boards, external effects, etc. Connect these jacks to the input
jacks of an external amp using shielded instrument cables.
37. EFFECTS BYPASS FOOTSWITCH: Connect a single
button footswitch to this jack for remote control of the Effects
Loop. Using a footswitch overrides the front panel Effects
Bypass switch.
38. GRAPHIC EQ/MUTE FOOTSWITCH: Connect a two
button footswitch to this jack for remote Mute and EQ On/Off
control. On the stereo 1/4” plug, the tip controls Mute and the
ring controls EQ On/Off. The EQ footswitch overrides the
front panel switch and the Mute function is available from
either location.
39. BIAMP HIGH/LOW OUTPUTS: When used in the biamp
mode, the Biamp High Out jack connects to the high frequency power amplifier and the Biamp Low Out jack connects to the low frequency power amp. (See pages 12 and
13.)
30 39 40
29
MONO BRIDGE:
*
BIAMP:
1+ HOT, 2+ RETURN
1+ LOW HOT, 1– LOW RETURN
2+ HIGH HOT, 2– HIGH RETURN
1+ HOT, 1–
*
3128
Page 9
SVT-4 PRO Bass Amplifier
IMPORTANT: This unit employs forced air cooling by means
of an internal fan. The rear and side ventillation slots must
remain unobstructed when operating this amplifier. When
mounting the unit in a rack make sure there is ample room
for proper air circulation. The rack must be constructed and
positioned in such a manner to allow proper air flow and the
exhausting of hot air away from the rack at all times.
40,41,44,45. TRANSFORMER BALANCED LINE OUTPUT
JACKS: These jacks supply a balanced signal for connec-
tion to a house mixing board, recording console or external
amplifier(s). The signal level at these jacks is controlled by
the front panel Line Out Level control (#16) and is governed
by the Stereo/Mono switch (#42) and the Pre/Post switch
(#43).
42. LINE OUT STEREO/MONO SWITCH: This switch is
active only when the Pre/Post switch (#43) is at the “post”
position (switch depressed). When active, this switch governs the signals at the Line Out jacks as follows:
In the Stereo Mode (switch out):
•The Channel A line out jacks (#44,45) supply a signal
from the Effects Loop Return Right/A jack (#47).
•The Channel B line out jacks (#40,41) supply a signal
from the Effects Loop Return Left/B jack (#46).
In the
Mono Mode (switch depressed):
•The Channel A line out jacks (#44,45) supply a “wet”
mono preamp signal – any external effects are applied
to this signal. The Effects Loop Left and Right returns
are summed together, creating a mono effects signal.
•The Channel B line out jacks (#40,41) supply a “dry”
mono preamp signal – no external effects are applied
to this signal.
43. LINE OUT PRE/POST SWITCH: The signal at the Line
Out jacks can be set to either Pre or Post EQ with this
switch. With the switch in the OUT position, the signal at the
jacks will be Pre-EQ. This is a direct output not affected by
any EQ or boost settings. With the switch depressed, the signal is Post-EQ and is controlled and modified by the tone
controls, Graphic EQ, the Master level control, the effects
loop and the Line Out Stereo/Mono switch (#42).
46. EFFECTS LOOP RETURN LEFT/B: When using stereo
effects, connect the effect’s left channel output into this jack.
Do not use this jack with mono effects.
47. EFFECTS LOOP RETURN RIGHT/A (MONO): When
using stereo effects, connect the effect’s right channel output
into this jack. When using mono effects, connect the effect’s
output into this jack.
48. EFFECTS LOOP SEND: When using an external signal
processor, connect the INPUT of the effect to this jack using
a shielded instrument cable to send the post-EQ signal to the
effect for processing.
NOTE: The effects loop (#46/47) may be bypassed by the
front panel switch (#17), or by the use of a footswitch.
49. TUNER OUT: This jack is provided for connection to an
electronic tuner and is always “live,” even when the Mute
switch (#3) is engaged, allowing for “silent tuning” as well as
a monitor feed which stays hot even when the house mix is
muted.
41 42 43 44 45 46 47 48 49
1+ HOT, 1–
BIAMP HIGH
INPUT MONO BRIDGE INPUT
BIAMP LOW/
32 33 34 35 36 37 38
Page 10
+
10
The Rear Panel – SPANISH TRANSLATIONS
SVT-4 PRO Bass Amplifier
(Speakon®es una marca registrada de Neutrik A.G.)
28. INTERRUPTOR DE CIRCUITO: El SVT-4 PRO utiliza un
interruptor de circuito en la línea de CA que ayuda a proteger el
equipo contra daños debidos a demandas excesivas de corriente. Si el amplificador deja de funcionar, revise el interruptor de
circuito. Si ha quedado abierto, el botón se encontrará desplazado hacia afuera y mostrará un color contrastante. Usted puede
restablecer el interruptor de circuito oprimiéndolo hacia adentro
hasta que se atore. El interruptor tiene que enfriarse un rato corto
antes de que el botón pueda atorarse. Si el interruptor de circuito
se abre repetidamente sin entrada de señal, haga que una persona de servicio calificada revise el amplificador.
29. CA ADENTRO: Enchufe con firmeza el extremo hembra del
cable proporcionado de energía CAdentro de este receptáculo, empujándolo por completo hasta dejarlo asentado totalmente. Enchufe el
extremo macho del cordón a una toma aterrizada de CA. ¡NO PASE
POR ALTO EL BORNE A TIERRA DE LA CLAVIJADE CA!
31. SALIDAS DE BOCINAS: Los “jacks” Speakon®: Se
recomienda el uso de estos conectores de servicio pesado cuando toque a niveles fuertes de salida, debido a su capacidad para
munejar corrientes increiblemente altas. Conecte el amplificador
a su(s) gabinete(s) de bocinas usando cables para bocinas de
calibre pesado terminando en conectores apropiados. (Mira al
izquiedra de los jacks para informacion de conneciones.)
Los “jacks” de 1/4”: Estos “jacks” monofónicos de 1/4” (dos
por cada canal, cableados en paralelo) le ofrecen un método
conveniente para conectar el amplificador a su(s) bocina(s)
usaado cables terminando en enchufes de 1/4”. (Cuando toque
a niveles fuetes de salida, se recomienda que use los “jacks”
Speakon®.)
32. INTERRUPTOR PUENTE ESTEREO / MONOFONICO: Este
interruptor establece el modo de operación del amplificador. En
la posición de “AFUERA” el amplificador se encuentra en el
Modo Estereofónico; con el interruptor en la posición de “ADENTRO” el amplificador se encuentra en el Modo Monofónico
Puenteado.
33,35. ENTRADAS DEL AMPLIFICADOR DE POTENCIA:
Estos “jacks” se conectan directamente al amplificador de potencia para usarse con preamplificadores. Cuando se usan fuentes
externas, conecte la SALIDA de las fuentes a estos “jacks” usando cables blindados de instrumentos para alimentar las señales
a las secciones del amplificador de potencia. La señal interna
queda desconectada cuando se inserta un enchufe. En el Modo
Monofónico, Canal A = Entrada. En el Modo Biamp, Canal A =
Entrada de Bajas, Canal B = Entrada de Altas.
34,36. SALIDAS DE PREAMPLIFICADOR: Estos “jacks” son
salidas directas de preamplificador para usarse con amplificadores de potencia externos, tableros mezcladores, efectos
externos, etc. Conecte las entradas de amplificador a estos
“jacks” usando cables blindados para instrumentos.
37. INTERRUPTOR DE PIE P ARADERIVACION DE EFECT OS:
Conecte un interruptor de pie de un solo botón a este “jack” para
el control remoto del Circuito de Efectos. El uso del interruptor de
pie pasa por alto el interruptor de Derivación de Efectos del
tablero delantero.
38. ECUALIZADOR GRAFICO (EQ) / INTERRUPTOR DE PIE
DEL MUDO: Conecte un interruptor de pie de dos botones a este
“jack” para el control remoto del Mudo y del Prendido / Apagado
del EQ. En el enchufe estereofonico de 1/4”, la punta controla el
Mudo y el anillo controla el Prendido / Apagado del EQ. El interruptor de pie del EQ pasa por alto el interruptor del panel
delantero y la funición del Mudo está disponible desde cualquiera
de las localizaciones.
39. SALIDAS ALTA / BAJA DE BlAMPLIFICACION: Cuando se
use en el modo de biamplificación, el “jack” de Salida de Altas de
Biamplificación se conecta al amplificador de potencia de frecuencias altas y el “jack” de Salida de Bajas de Biamplificación
se conecta al amplificador de potencia de frecuencias bajas.
(Véase las páginas 12 y 13.)
40,41,44,45. JACKS DE LINEAAFUERA: Estos “jacks” proveen
una señal para conectarla a un tablero mezclador, con
30 39 40
29
MONO BRIDGE:
*
BIAMP:
1+ HOT, 2+ RETURN
1+ LOW HOT, 1– LOW RETURN
2+ HIGH HOT, 2– HIGH RETURN
1+ HOT, 1–
*
1
3128
Page 11
11
SVT-4 PRO Bass Amplifier
1+ HOT, 1–
BIAMP HIGH
INPUT MONO BRIDGE INPUT
BIAMP LOW/
41 42 43 44 45 46 47 48 49
32 33 34 35 36 37 38
IMPORTANTE: Esta unidad utiliza un ventilador interno para aire
forzado que refresca. Las ranuras para el ventaillation en el trasero y
lados no se deben obstruir cuando se usa este amplificador. Cuándo
el amplificador se monta en un anaquel, suficiente espacio para la cir-
culación aérea apropiada se debe proporcionar. El anaquel se debe
construir y debe ser posicionado para permitir el flujo apropiado de
aire. El escape de la palabrería debe fluir lejos del anaquel siempre.
sola de grabación o amplificador(es) externo(s) de la casa. El
nivel de la señal en estos “jacks” se controla mediante el control de Nivel Línea Afirera (#16) del tablero delantero y se gobierna mediante el interruptor Estéreo / Monofónico (#42) y el
interruptor Pre / Post (#43).
42. INTERRUPTOR DE LINEA AFUERA ESTEREO /
MONOFONICO: Este interruptor queda activado solamente
cuando el interruptor Pro / Post (#43) se encuentra en la posición “post” (interruptor hacia adentro). Cuando se encuentra
activado, este interruptor gobierna las señales en los “jacks”
de Línea Afuera como sigue:
En el
Modo Estereofónico (interruptor hacia “afuera”):
•Los “jacks” de linea afuera del Canal A (#44,45)
proveen una señal del “jack” A(#47) / Retorno Derecho
de Circuito de Efectos.
•Los “jacks” de línea afuera del Canal B (#40,41)
proveen una señal del “jack” B (#46) / Retorno
Izquierdo del Circuito de Efectos.
En el Modo Monofónico (interruptor hacia “adentro”):
•Los “jacks” de línea afuera del Canal A (#44,45)
proveen una señal de preamplificador monofónica
“húmeda” – cualquier efecto externo queda aplicado a
esta señal. Los retornos Izquierdo y Derecho del
Circuito de Efectos se juntan, creando una señal de
efectos monofónica.
•Los “jacks” de línea afuera del Canal B (#40,41)
proveen una señal de preamplíficidor monofónica
“seca” — no se aplica ningún efecto externo a esta
señal.
43. INTERRUPTOR PRE / POST LINEAAFUERA: La señal en
los “jacks” de Línea Afuera se pueden poner en posición ya sea
Pre o Post EQ usando este interruptor. Con el interruptor en la
posción de AFUERA, la señal en los “jacks” será Pre-EQ. Esta
es un salida directa que no será afectada por ninguna posición
del EQ o del refuerzo. Con el interruptor en la posición de ADENTRO, la señal es Post-EQ y se controla y modifica mediante los
controles de tono, el EQ Gráfico, el control de nivel Maestro, el
circuito de efectos y el interruptor Estéreo / Monofónico Línea
Afuera (#42).
46. RETORNO IZQUIERDO/B DEL CIRCUITO DE EFECTOS:
Cuando use efectos estereofónicos, conecte la salida del canal
izquierdo del efecto a este “jack”. No use este “jack” con efectos
monofónicos.
47. RETORNO DERECHO/A (MONOFONICO) DEL CIRCUITO
DE EFECTOS: Cuando use efectos estereofónicos, conecte la
salida del canal derecho del efecto a este “jack”. Cuando use
efectos monofónicos, conecte la salida del efecto a este “jack”.
48. ENVIO DEL CIRCUITO DE EFECTOS: Cuando use un
procesador de señales externo, conecte la SALIDA del efecto a
este “jack”, usando un cable blindado de instrumentos a fin de
enviar la señal post-EQ al efecto para su procesamiento.
49. SALIDASINTONIZADOR: Este “jack” se provee para conectarlo a un sintonizador electrónico y siempre se encuentra “vivo”,
aún cuando se encuentre activado el interruptor Mudo (#3), lo
que permite “sintonizar en silencio” lo mismo que una alimentación monitor que se mantiene caliente aún cuando la mezcla de la casa esté muda.
Page 12
In the example shown below, the SVT-4 PRO’s two internal power amplifiers are bridged together to produce maximum output power.
Depress the Stereo/Mono Bridge switch (Mono Bridged position) and connect the system as follows:
1: Connect a heavy duty speaker cable terminated with a Speakon
®
connector (pin 1+ = “+”, pin 2+ = “–”) from the SVT-4 PRO’s Mono Bridge / Biamp
Output jack to the input jack of a speaker cabinet capable of handling the extremely high output power.
In the example shown below, the SVT-4 PRO’s two internal power amplifiers will each power a set of full range cabinets.
Set the Stereo/Mono Bridge switch OUT (Stereo position) and connect the system as follows:
1: Connect a speaker cable from the SVT -4 PRO’s Power Amp ASpeaker Output jack to the input jack(s) of a set of full range speakers.
2: Connect a speaker cable from the SVT -4 PRO’s Power Amp B Speaker Output jack to the input jack(s) of another set of full range speakers.
In the example shown below, the SVT-4 PRO’s two internal power amplifiers will each power a set of full range cabinets in stereo.
Set the Stereo/Mono Bridge switch OUT (Stereo position) and connect the system as follows:
1: Connect a shielded cable from the Effects Send of the SVT -4 PRO to the Input of a Stereo Ef fects Processor.
2: Connect a shielded cable from the Left Output of the Processor to the SVT -4 PRO’s Ef fects Return Left / B jack.
3: Connect a shielded cable from the Right Output of the Processor to the SVT -4 PRO’s Ef fects Return Right / A jack.
4: Connect a speaker cable from the SVT -4 PRO’s Power Amp ASpeaker Output jack to the input jack(s) of the Stage Left speakers.
5: Connect a speaker cable from the SVT -4 PRO’s Power Amp B Speaker Output jack to the input jack(s) of the Stage Right speakers.
For Speakon
®
connectors pin 1+ = “+”, pin 1– = “–”.
Connections:
12
Mono
Bridged
Dual
Mono
T
Stereo
SVT-4 PRO Bass Amplifier
SVT-4 PRO
MONO
BRIDGE
1
IN
(MONO)
TO
INPUT
JACK
SVT-4 PRO
PWR
AMP B
PWR
AMP A
FULL RANGE
CABINET(S)
NOTE: BE
ABSOLUTELY
CERTAIN THAT
THE CABINET(S)
ARE ABLE TO
HANDLE THE
EXTREMELY
HIGH OUTPUT
POWER OF THE
AMP IN THIS
MODE!
12
OUT
(STEREO)
TO
INPUT
JACK
TO
INPUT
JACK
FULL RANGE
CABINET(S)
FULL RANGE
CABINET(S)
LEFT
STAGE LEFT
CABINET(S)
STEREO
EFFECTS
PROCESSOR
SVT-4 PRO
TO
INPUT
JACK
RIGHT
OUT
OUT
32 1
PWR
AMP B
45
PWR
AMP A
OUT
(STEREO)
EFX RET
LEFT/B
INPUT
EFX RET
RIGHT/A
EFX
SEND
TO
INPUT
JACK
STAGE RIGH
CABINET(S)
Page 13
In the example shown below, the SVT-4 PRO’s two internal power amplifiers will power both a full range cabinet and a low frequency cabinet. The
crossover point for the low frequency cabinet is determined by the Crossover Frequency control (#21).
Set the Stereo/Mono Bridge switch OUT (Stereo position) and connect the system as follows:
1: Connect a shielded cable from the SVT -4 PRO’s Biamp Low Out jack to its Power Amp APower Amp In jack.
2: Connect a speaker cable from the SVT -4 PRO’s Power Amp ASpeaker Output jack to the input jack of the low frequency cabinet(s).
3: Connect a speaker cable from the SVT -4 PRO’s Power Amp B Speaker Output jack to the input jack of the full range cabinet(s).
In the example shown below, the SVT-4 PRO’s two internal power amplifiers will power both a high frequency cabinet and a low frequency cabinet. The
crossover point for the cabinets is determined by the Crossover Frequency control (#21).
Set the Stereo/Mono Bridge switch OUT (Stereo position) and connect the system as follows:
1: Connect a shielded cable from the SVT -4 PRO’s Biamp High Output jack to its Power Amp B Power Amp In jack.
2: Connect a shielded cable from the SVT -4 PRO’s Biamp Low Output jack to its Power Amp APower Amp In jack.
3: Connect a speaker cable from the SVT -4 PRO’s Power Amp ASpeaker Output jack to the input jack of the low frequency cabinet(s).
4: Connect a speaker cable from the SVT -4 PRO’s Power Amp B Speaker Output jack to the input jack of the high frequency cabinet(s).
In the example shown below, the SVT -4 PRO’s two internal power amplifiers are bridged together and will power the low frequency cabinet(s). Asecond amplifier will be used to power the high frequency cabinet(s). The crossover point for the cabinets is determined by the Crossover Frequency control (#21).
Depress the Stereo/Mono Bridge switch (Mono Bridge position) and connect the system as follows:
1: Connect a shielded cable from the SVT -4 PRO’s Biamp High Output jack to the Input jack of the High Frequency power amplifier.
2: Connect a shielded cable from the SVT -4 PRO’s Biamp Low output jack to its Power Amp AMono Bridge Input jack.
3: Connect the high frequency power amp’s Speaker Output jack to the input jack(s) of the high frequency cabinet(s). (Observe amplifier’s minimum
load rating!)
4: Connect a heavy duty speaker cable terminated with a Speakon
®
connector (pin 1+ = “+”, pin 2+ = “–”) from the SVT-4 PRO’s Mono Bridge / Biamp
Output jack to the input jack of the low frequency speaker cabinet.
13
Biamp: Full
Range / Lows
Biamp:
Highs / Lows
Biamp with a
Second Amp
SVT-4 PRO Bass Amplifier
SVT-4 PRO
SVT-4 PRO
LO OUT
PWR
AMP B
3 2
BIAMP
HI OUT
PWR
AMP B
BIAMP
1
BIAMP
LO OUT
21
PWR
AMP A
PWR
AMP A
34
OUT
(STEREO)
POWER
AMP B
P.A. IN
OUT
(STEREO)
POWER
AMP A
P.A. IN
POWER
AMP A
P.A. IN
INPUT
JACK
INPUT
JACK
TO
INPUT
JACK
FULL RANGE
CABINET(S)
TO
LOW FREQ.
CABINET(S)
TO
HIGH FREQ.
CABINET(S)
LOW FREQ.
CABINET(S)
TO
INPUT
JACK
BIAMP
HI OUT
1
MONO
BRIDGE
BIAMP
LO OUT
MONO BRIDGE
4
3
2
POWER
AMP A
P.A. IN
(MONO
IN
(MONO)
BRIDGE)
MODEL:
SVP-1500
SERIAL:
SVP15OOU12B
LINE: V ~ Hz
120 60
WATTS: MAX
1500
IN
(MONO)
CH A
INPUT
TO
INPUT
JACK
TO
INPUT
JACK
HIGH FREQ.
CABINET(S)
LOW FREQ.
CABINET(S)
SVT-4 PRO
POWER AMP
(SVP-1500)
Page 14
14
Some Suggested Settings
Since so many variables
affect the actual sound of any
system, the following settings are
offered as starting points to help
you find the exact sounds your
playing demands. When using
the SVT-4PRO, please keep in
mind the following points:
• The Gain control should be
adjusted until the peak LED
flashes on strong signals. (This
level will vary, depending on
your instrument and playing
style.)
• The Compressor control can
be adjusted to control the
dynamic response of your
instrument. Adjust according to
your own preference.
• The Graphic EQ can be used
to further fine-tune these basic
suggested setting, to extend
the frequency response of the
cabinet being used, to compensate for room acoustics, or
to act like a “second channel”
SVT-4 PRO Bass Amplifier
Rack Mounting
When mounting the SVT-4 PRO into a rack, the four bottom feet should be removed to maintain the three rack space height of the amplifier. Be sure to keep the feet and their attachment bolts for future use. If the feet are reinstalled, never use screws which will protrude
farther into the amplifier than the original hardware.
The rack must be a high quality enclosure capable of securely supporting the weight of the amplifier. Tighten the mounting screws
securely through the amplifier’s face plate, into the rack rails. Check the rack and mounting screws occasionally to ensure a continually safe and secure installation.
Setting 1 - Classic Ampeg
OUT
OUT
Setting 2 - Funky Thing
OUT
OUT
IN
IN
Setting 3 - Ethereal Fretless
OUT
OUT
Setting 4 - "Jaco"
OUT
OUT OUT
Setting 5 - R&B Groove
OUT
OUT
OUT
OUT
OUT
OUT
IN
OUT
OUT
Setting 6 - Downright Upright
Done Right
OUT
OUT
OUT
OUT
Page 15
15
Troubleshooting
In the unlikely event that your SVT-4 PRO should malfunction, take a few minutes to troubleshoot it before you call
for service. You can save yourself time and money by doing it yourself, and often the cure for the problem is something
quite simple.
If the problem isn’t covered above, or if the steps lead you here, then contact your Ampeg dealer for service information. Also, you should refer your amp for servicing if it gets dropped, has liquid spilled into it, or sustains damage to its
power cord (see page 2).
System Block Diagram
INPUT
FRONT
TUNER
OUT
-15dB PAD
MUTE
REAR
TUNER
OUT
FOOTSWITCH
TUBE
GAIN
STAGE
COMPRESSION
GAIN
COMPRESSION
BASS
MIDRANGE
FREQUENCY
ULTRA
HIGH
TREBLE
BRIGHT
ULTRA
LOW
TONE CIRCUITS
PEAK
LED
9 BAND
GRAPHIC
EQ
LEVEL
(X9)
FOOTSWITCH
EQ IN
BAL/UNBAL
LINE OUT
(B)
BAL
LINE
OUT
(B)
PRE
LINE OUT
PRE/POST
POST
EFFECTS
SEND
(MONO)
HIGH
OUT
SPKR
OUT
(A)
POWER
AMP IN
(A/MONO)
PREAMP
OUT
(A/MONO)
LOW
OUT
EFFECTS
RETURN
(LEFT/B)
EFFECTS
RETURN
(RIGHT/A/MONO)
STEREO
MONO
BYPASS
STEREO
LINE OUT
STEREO/
MONO
MONO
BAL/UNBAL
LINE OUT
(A/MONO)
BAL
LINE
OUT
(A/MONO)
PRE
POST
SPKR
OUT
(A)
SPEAKON
JACK
(MONO
BRDG/
BIAMP)
1+
2+
1- 2-
SPEAKON
JACK
(A)
SPEAKON
JACK
(B)
1+
2+
1- 2-
LIMIT
DEFEAT
POWER
AMP A
STEREO
BRIDGE MONO
STEREO/
BRIDGED
STEREO
BRIDGE MONO
LINE
OUT
LEVEL
BYPASS
EFFECTS
BYPASS
(B)
FOOTSWITCH
Σ
FREQ BAL
BI-AMP
(A/
MONO)
MASTER
VOLUME
SPKR
OUT
(B)
POWER
AMP IN
(B)
PREAMP
OUT
(B)
SPKR
OUT
(B)
POWER
AMP B
LIMIT
LED
LIMITER
LIMITER
1+
2+
1- 2-
SVT-4 PRO Bass Amplifier
NO SOUND
LEDs LIGHT
Check amp controls, check
for signal from bass
NO SOUND
SOUND OK
Listen for hum
NO HUM HUM
Check speaker Unplug bass,
touch tip of cable
Speaker OK
SOUND OK
NO CHANGE
Replace cable
LEDs DON'T LIGHT
Check AC outlet
NO POWEROUTLET OK
Check amp's power
cord, circuit breaker,
power switch
Check house fusebox
or circuit breaker
OK
POOR SOUND
Check bass, cables
POOR SOUND
Check speaker(s)
SPEAKER(S) OK,
POOR SOUND
POOR SOUND SOUND OK
SOUND OK
SPEAKER(S)
DEFECTIVE
Replace speaker(s)
NO CHANGE
SEE BELOW SEE BELOW
Page 16
Ampeg reserves the right to change specifications without notice.
Ampeg is proudly Made in America. ©1999 SLM Electronics, 1400 Ferguson Avenue, St. Louis, MO 63133 U.S.A.
P/N 47-617-04 • 102203
Technical Specifications
OUTPUT POWER RATING 1600 Watts Mono-Bridged @ 4 Ohms (1200 Watts Continuous)
1200 Watts Mono-Bridged @ 8 Ohms (900 Watts Continuous)
2 x 900 Watts @ 2 Ohms (600 Watts Continuous)
2 x 625 Watts @ 4 Ohms (490 Watts Continuous)
2 x 350 Watts @ 8 Ohms (300 Watts Continuous)
TONE CONTROL RANGE
Bass: ±12dB @ 50Hz
Midrange: ±15dB @ Frequency selected (220, 450, 800, 1.6k or 3kHz)
Treble: +14dB / -19dB @ 5kHz
GRAPHIC EQ LEVEL ±10dB
GRAPHIC EQ RANGE
33Hz: ±15dB
80Hz, 150Hz, 300Hz,
600Hz, 900Hz, 2kHz: ±8dB
5kHz: ±9dB
8kHz: ±10dB
BRIGHT SWITCH +6dB @2kHz
ULTRA HIGH SWITCH +6dB @ 5kHz
ULTRA LOW SWITCH +2.5dB @ 50Hz
-12dB @ 560Hz
+1.5dB @ 5kHz
SIGNAL TO NOISE RATIO 75dB typical
COMPRESSION RATIO 10:1 (2dB change in output for 20dB change in input [50mV to 500mV])
FOOTSWITCH JACK Effects Bypass (mono); Graphic EQ On/Off, Mute On/Off – Tip = Mute, Ring = EQ
TUBE COMPLEMENT 12AX7 (3)
POWER REQUIREMENTS
Domestic: 120VAC, 60Hz, 1.4kVA
Export: 100/115VAC 50/60Hz, 1.4kVA
230VAC, 50/60Hz, 1.4kVA
SIZE AND WEIGHT 19/17.4”W x 5.6”H (with feet) x 15.5”D; 39.5 lbs
SVT-4 PRO Bass Amplifier
www.ampeg.com
Declaration Of Conformity
#32, Effective 01-01-2001
Manufacturer’s Name: SLM Electronics
Production Facility: 1901 Congressional Drive, St. Louis, MO 63146, USA
Production Facility: 700 Hwy 202 W, Yellville, AR 72687, USA
Shipping Facility: 1400 Ferguson Ave., St. Louis, MO 63133, USA
Office Facility: 1400 Ferguson Ave., St. Louis, MO 63133, USA
Product Type: Audio Amplifier
Complies with the following Standards:
Safety: EN60065, E60065, C22.2, UL6500 and/or UL813
EMC: Directive 89/336/EEC, EN55103, EN55013, EN61000,
and/or FCC 47CFR 15B clA
Supplementary information provided by:
SLM Electronics - R & D Engineering
1901 Congressional Drive, St Louis, MO 63146, USA
Tel.: 314-569-0141, Fax: 314-569-0175
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