SVT-4 PRO front panel:
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. A footswitch 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; see 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.
Technical Specifications:
OUTPUT POWER RATING
TONECONTROL RANGE
BASS:
MIDRANGE:
TREBLE:
8. ULTRAHIGH: This switch, when depressed, increases
the high frequency output by 6dB at 5kHz.
9. ULTRALOW: 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 (5string 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.
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; see 38, rear panel.)
16. LINEOUTLEVEL: 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; see 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 lev-
1600 watts Mono Bridged @ 4 ohms (1200 watts continuous)
1200 watts Mono Bridged @ 8 ohms (900 watts continuous)
Mono Bridged @ 4 ohms (1200 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)
±12dB @ 50Hz
±15dB @ selected frequency (220, 450, 800, 1.6k or 3kHz)
+14, -19dB @ 5kHz
els, 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 pages 13
& 14.)
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-BANDGRAPHICEQ: 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.
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. POWERLED: This LED illuminates green when the
Power switch (27) is depressed.
26. ACTIVELED: 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.
SVT-4 PRO rear panel:
28. CIRCUITBREAKER: The SVT-4 PRO employs an amps. When using external sources, connect the OUTPUT In the Stereo Mode (switch out):
AC line circuit breaker to help protect against damages due of the sources to these jacks using shielded instrument
•The Channel A line out jacks (44,45) supply a sigto excessive current demands. If the amplifier stops work- cables to feed the signals into the power amp sections. The
nal from the Effects Loop Return Right/A jack (47).
ing, check the circuit breaker.
internal signal is disconnected when a plug is inserted. In
•The Channel B line out jacks (40,41) supply a sigNOTE: When the circuit breaker opens, the button will be the Mono Mode, Channel A = Input. In the Biamp Mode,
nal from the Effects Loop Return Left/B jack (46).
protruding and showing a contrasting color. You can reset Channel A = Low (frequency) Input, Channel B = High (freIn
the
Mono Mode (switch depressed):
the circuit breaker by pushing it in until it latches. The quency) Input.
•The
Channel A line out jacks (44,45) supply a “wet”
breaker must cool down for a short time before the button 34,36. PREAMP OUTPUTS: These jacks are direct premono preamp signal – any external effects are
will latch. If the circuit breaker opens repeatedly with no sig- amp outputs for use with external power amplifiers, mixing
applied to this signal. The Effects Loop Left and
nal input, have the amplifier checked by a qualified service boards, external effects, etc. Connect these jacks to the
Right returns are summed together, creating a
person.
input jacks of an external amp using shielded instrument
mono effects signal.
29. ACLINEIN: Firmly insert the supplied AC power cord cables.
•The
Channel B line out jacks (40,41) supply a “dry”
into this socket until it is fully seated. Plug the male end of 37. EFFECTSBYPASSFOOTSWITCH: Connect a sinmono preamp signal – no external effects are
the cord into a grounded AC outlet. DO NOT DEFEAT THE gle button footswitch to this jack for remote control of the
applied to this signal.
GROUND PRONG OF THE AC PLUG!
Effects Loop. Using a footswitch overrides the front panel
E
ffects
Bypass
switch.
4
3
.
LINE OUT PRE/POST SWITCH: The signal at the
30. ACOUTLET (Domestic units only): This unswitched
outlet lets you connect any AC powered device (such as an 38. GRAPHIC EQ/MUTE FOOTSWITCH: Connect a two Line Out jacks can be set to either Pre or Post EQ with this
effects unit or an electronic tuner) up to a maximum of 300 button footswitch to this jack for remote Mute and EQ switch. With the switch in the OUT position, the signal at
watts. The jack is “hot” whenever the amplifier is plugged On/Off control. On the stereo 1/4” plug, the tip controls the jacks will be Pre-EQ. This is a direct output not affectinto a live AC outlet, regardless of the setting of the ampli- Mute and the ring controls EQ On/Off. The EQ footswitch ed by any EQ or boost settings. With the switch depressed,
fier’s Power switch.
overrides the front panel switch and the Mute function is the signal is Post-EQ and is controlled and modified by the
tone controls, Graphic EQ, the Master level control, the
®
31. SPEAKER OUTPUTS: The Speakon Jacks: Use of available from either location.
effects loop and the Line Out Stereo/Mono switch (42).
these heavy-duty connectors is recommended when play- 39. BIAMP HIGH/LOWOUTPUTS: When used in the
ing at full output levels. Connect the amplifier to your biamp mode, the Biamp High Out jack connects to the high 46. EFFECTS LOOP RETURN LEFT/B: When using
speaker cabinet(s) using heavy gauge speaker cables ter- frequency power amplifier and the Biamp Low Out jack stereo effects, connect the effect’s left channel output into
minated with the appropriate connectors. (In the Mono connects to the low frequency power amp. (See pages 12 this jack. Do not use this jack with mono effects.
47. EFFECTSLOOP RETURN RIGHT/A (MONO):
Bridge mode, pin 1+ = “+,” pin 2+ = “–” – see the text to left and 13.)
of the jacks for more pinout information.)
40,41,44,45. TRANSFORMER BALANCED LINE OUT- When using stereo effects, connect the effect’s right chanThe 1/4” Jacks: These mono 1/4” jacks (two per channel, PUT JACKS: These jacks supply a balanced signal for nel output into this jack. When using mono effects, connect
wired in parallel) offer you a convenient method of con- connection to a house mixing board, recording console or the effect’s output into this jack.
necting the amplifier to your speaker(s) using cables termi- external amplifier(s). The signal level at these jacks is con- 48. EFFECTSLOOPSEND: When using an external
nated with 1/4” plugs. (Whenever playing at full output lev- trolled by the front panel Line Out Level control (16) and is signal processor, connect the INPUT of the effect to this
governed by the Stereo/Mono switch (42) and the Pre/Post jack using a shielded instrument cable to send the post-EQ
els, it is recommended that you use the Speakon® jacks).
signal to the effect for processing.
32. STEREO/MONO BRIDGE SWITCH: This switch sets switch (43).
the operating mode of the amplifier. In the “out” position the 42. LINE OUT STEREO/MONO SWITCH: This switch 49. TUNEROUT: This jack is provided for connection to
amplifier is in the Stereo Mode; with the switch in the “in” is active only when the Pre/Post switch (43) is at the “post” an electronic tuner and is always “live,” even when the
position (switch depressed). When active, this switch gov- Mute switch (3) is engaged, allowing for “silent tuning” as
position the amplifier is in the Mono Bridged Mode.
well as a monitor feed which stays hot even when the
33,35. POWER AMPINPUTS: These jacks connect erns the signals at the Line Out jacks as follows:
house mix is muted.
directly to the internal power amp for use with external preTechnical Specifications (con’t):
GRAPHIC EQ RANGE/LEVEL ±15dB @ 33Hz; ±8dB @ 80Hz, 150Hz, 300Hz, 600Hz, 900Hz, 2kHz; ±9dB @ 5kHz; ±10dB @ 8kHz; Level = ±10dB
TONE MODIFIER SWITCHES Bright = +6dB @2kHz; Ultra High = +6dB @ 5kHz, Ultra Low = +2.5 @ 50,-12 @ 560 & +1.5dB @ 5kHz
SIGNAL TO NOISE RATIO
75dB typical
FOOTSWITCH JACK
Effects Bypass (mono); Graphic EQ On/Off, Mute On/Off – Tip = Mute, Ring = EQ
TUBE COMPLEMENT
12AX7 (3)
POWER REQUIREMENTS
120VAC, 60Hz, 425VA; 100VAC, 50/60Hz, 425VA; 230VAC, 50/60Hz, 425VA
SIZE AND WEIGHT
19” W x 5.6” H (w/feet) x 15.5” D, 42 lbs.
SVT-4 PRO hookups:
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). A full range signal
is sent to the other cabinet.
Set the Stereo/Mono Bridge switch to the OUT (Stereo) position and connect the system as follows:
Biamp: Full
Range / Lows
1: Connect a shielded cable from the SVT-4 PRO’s Biamp Low Out jack to its Power Amp A Power Amp In jack.
2: Connect a speaker cable from the SVT-4 PRO’s Power Amp A Speaker 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 to the OUT (Stereo) position and connect the system as follows:
Biamp:
Highs / Lows
1:
2:
3:
4:
Connect a shielded cable from the SVT-4 PRO’s Biamp High Output jack to its Power Amp B Power Amp In jack.
Connect a shielded cable from the SVT-4 PRO’s Biamp Low Output jack to its Power Amp A Power Amp In jack.
Connect a speaker cable from the SVT-4 PRO’s Power Amp A Speaker Output jack to the input jack of the low frequency cabinet(s).
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). A second 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).
Set the Stereo/Mono Bridge switch to the IN (Mono Bridge) position and connect the system as follows:
Biamp with a
Second Amp
1:
2:
3:
4:
Connect a shielded cable from the SVT-4 PRO’s Biamp High Output jack to the Input jack of the High Frequency power amplifier.
Connect a shielded cable from the SVT-4 PRO’s Biamp Low output jack to its Power Amp A Mono Bridge Input jack.
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!)
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.
SVT-4 PRO hookups:
In the example shown below, the SVT-4 PRO’s two internal power amplifiers are bridged together to produce maximum output power.
Set the Stereo/Mono Bridge switch to the IN (Mono Bridged) position and connect the system as follows:
Mono
Bridged
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 to the OUT (Stereo) position and connect the system as follows:
Dual
Mono
1: Connect a speaker cable from the SVT-4 PRO’s Power Amp A Speaker 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 to the OUT (Stereo) position and connect the system as follows:
Stereo
1:
2:
3:
4:
5:
Connect a shielded cable from the Effects Send of the SVT-4 PRO to the Input of a Stereo Effects Processor.
Connect a shielded cable from the Left Output of the Processor to the SVT-4 PRO’s Effects Return Left / B jack.
Connect a shielded cable from the Right Output of the Processor to the SVT-4 PRO’s Effects Return Right / A jack.
Connect a speaker cable from the SVT-4 PRO’s Power Amp A Speaker Output jack to the input jack(s) of the Stage Left speakers.
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– = “–”.