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2 8 .C I R C U I TB R E A K E R : The SVT-4 PRO employs an
AC line circuit breaker to help protect against damages due to excessive current demands. If the amplifier stops work-
ing, check the circuit breaker.
N O T E : 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. T h e
breaker must cool down for a short time before the button
will latch. If the circuit breaker opens repeatedly with no sig- nal input, have the amplifier checked by a qualified service
p e r s o n .
2 9 . A CL I N EI N : 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 A Coutlet. DO NOT DEFEAT THE
GROUND PRONG OF THE AC PLUG!
3 0 . A CO U T L E T (Domestic units only): This unswitched
outlet lets you connect any AC powered device (such as an
e f fects 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 ampli-
f i e r s Power switch.
31. SPEAKER O U T P U T S :The Speakon
®J a c k s :Use of
these heavy-duty connectors is recommended when play-
ing at full output levels. Connect the amplifier to your speaker cabinet(s) using heavy gauge speaker cables ter-
minated with the appropriate connectors. (In the Mono Bridge mode, pin 1+ = +, pin 2+ = -“ -“ see the text to left
of the jacks for more pinout information.)
The 1/4 Jacks: These mono 1/4 jacks (two per channel,
wired in parallel) offer you a convenient method of con- necting the amplifier to your speaker(s) using cables termi-
nated with 1/4 plugs. (Whenever playing at full output lev- els, 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 A M PI N P U T S :These jacks connect
directly to the internal power amp for use with external pre- amps. 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. T h e
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 (fre- quency) Input.
34,36. PREAMP O U T P U T S :These jacks are direct pre-
amp 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 c a b l e s .
3 7 . E F F E C T SB Y PA S SF O O T S W I T C H : Connect a sin-
gle button footswitch to this jack for remote control of the
E f fects Loop. Using a footswitch overrides the front panel
E f fects Bypass switch.
3 8 . G R A P H I C EQ/MUTE FOOTSWITCH: Connect a two
button footswitch to this jack for remote Mute and EQ
O n / O f f 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 H I G H / L O WO U T P U T S : When used in the
biamp mode, the Biamp High Out jack connects to the high frequency power amplifier and the Biamp Low Out jackconnects to the low frequency power amp. (See pages 12
and 13.)
40,41,44,45. TRANSFORMER BALANCED LINE OUT- PUT JACKS: These jacks supply a balanced signal for
connection to a house mixing board, recording console or external amplifier(s). The signal level at these jacks is con-
trolled by the front panel Line Out Level control (16) and is governed by the Stereo/Mono switch (42) and the Pre/Post
switch (43).
4 2 . L I N E OUT STEREO/MONO S W I T C H :This switch
is active only when the Pre/Post switch (43) is at the post position (switch depressed). When active, this switch gov-erns 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 sig-nal from the Effects Loop Return Right/A jack (47).
-The Channel B line out jacks (40,41) supply a sig- nal 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 wetmono preamp signal -“ any external effects areapplied 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.
4 3 . L I N E OUT PRE/POST S W I T C H :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 af f e c t-
ed 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
e f fects loop and the Line Out Stereo/Mono switch (42).
46. EFFECTS L O O PRETURN LEFT/B: When using
stereo effects, connect the ef f e c t s left channel output into
this jack. Do not use this jack with mono ef f e c t s .
4 7 . E F F E C T SL O O P RETURN RIGHT/A ( M O N O ) :
When using stereo effects, connect the ef f e c t s right chan-
nel output into this jack. When using mono effects, connect
the ef f e c t s output into this jack.
4 8 . E F F E C T SL O O PS E N D : 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.
4 9 . T U N E RO U T :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.
SVT-4 PRO rear panel:
Technical Specifications (cont):
GRAPHIC EQ RANGE/LEVEL ±15dB @ 33Hz; ±8dB @ 80Hz, 150Hz, 300Hz, 600Hz, 900Hz, 2kHz; ±9dB @ 5kHz; ±10dB @ 8kHz; Level = ±10dB
TONE MODIFIER SWITCHESBright = +6dB @2kHz; Ultra High = +6dB @ 5kHz, Ultra Low = +2.5 @ 50,-12\
@ 560 & +1.5dB @ 5kHz
SIGNAL TO NOISE RATIO 75dB typical
FOOTSWITCH JACKEffects 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.
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SVT-4 PRO hookups:
In the example shown below, the SVT-4 PROs two internal power amplifiers will power both a full range cabinet and a low frequencycabinet. The crossover point for the low frequency cabinet is determined by the Crossover Frequency control (21). A full range signalis sent to the other cabinet.
Set the Stereo/Mono Bridge switch to the OUT (Stereo) position and connect the system as follows:
1 : Connect a shielded cable from the SVT-4 PROs Biamp Low Out jack to its Power Amp A Power Amp In jack.
2 : Connect a speaker cable from the SVT-4 PROs 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 PROs Power Amp B Speaker Output jack to the input jack of the full range cabinet(s).
In the example shown below, the SVT-4 PROs 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:
1 : Connect a shielded cable from the SVT-4 PROs Biamp High Output jack to its Power Amp B Power Amp In jack.
2 : Connect a shielded cable from the SVT-4 PROs Biamp Low Output jack to its Power Amp A Power Amp In jack.
3 : Connect a speaker cable from the SVT-4 PROs Power Amp A Speaker Output jack to the input jack of the low frequency cabinet(s).
4 : Connect a speaker cable from the SVT-4 PROs Power Amp B Speaker Output jack to the input jack of the high frequency cabinet(s).
In the example shown below, the SVT-4 PROs 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:
1 : Connect a shielded cable from the SVT-4 PROs Biamp High Output jack to the Input jack of the High Frequency power amplifier.
2 : Connect a shielded cable from the SVT-4 PROs Biamp Low output jack to its Power Amp A Mono Bridge Input jack.
3 : Connect the high frequency power amps Speaker Output jack to the input jack(s) of the high frequency cabinet(s). (Observe amplifiers minimum load rating!)
4 : Connect a heavy duty speaker cable terminated with a Speakon
®connector (pin 1+ = +, pin 2+ = -“) from the SVT-4 PROs Mono Bridge / Biamp Output
jack to the input jack of the low frequency speaker cabinet.
Biamp: Full
Range / Lows
Biamp:
Highs / Lows
Biamp with a Second Amp
