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Power
V 4 2
POWER AMPLIFIER
AMPLIFIER
230V
GND
A
50Hz
LIFT
INPUT S
5,0A
MODEL TYPE: YS4020
BRIDGE
STEREO
MONO
MODE
LIMITER
DEFEAT
ENABLE
B
FILTER
40Hz
MADE IN CANADA
20Hz
Introduction
The VTC Pro Audio V42 and V44 power amplifiers are designed and built to provide years
of trouble free performance. They weigh a comfortable (but solid) 42 pounds each, fit into
two rack spaces, and reproduce music with over 4000 Watts of headroom. The amplifiers are
fully protected from accidental short circuits and will drive reactive phase shifted loads with-
out difficulty. The design goal was to create an amplifier which does exactly what an ampli-
fier should do: reproduce music with great power, complete reliability, and uncompromising
signal fidelity. We think you will agree that the VTC Pro Audio V42 and V44 does exactly that.
1. Balanced Inputs
Either XLR or two–circuit T.R.S. (Tip-Ring-Sleeve) Stereo 1/4-inch phone cords may be used.
Each channel's XLR input is internally paralleled with its phone input (The TIP of the chan-
nel A phone input is connected to pin 2 of its XLR input, the ring is connected to pin 3, and
the Sleeve is connected to PIN 1). PIN 2 is in phase, PIN 3 is 180-degrees out-of-phase, and
PIN 1 is ground. It is recommended to use balanced lines for the best hum -free performance,
particularly when connecting multiple amplifier inputs together.
2. Unbalanced Inputs
Ordinary single circuit Standard 1/4-inch PHONE plugs may be used to connect
unbalanced signals.
V 4 2
120VAC
60Hz
10A
LR 21877
A-Z1103A / 1v1
WARNING: SHOCK HAZARD • DO NOT OPEN
AVIS: RISQUE DE CHOC • NE PAS OUVRIR
NOTE: Such plugs effectively connect the ring terminal to sleeve ground, so they
work correctly. However, if you use a Stereo 1/4-inch PHONE plug on an unbal-
anced line, you MUST short the Ring terminal to the sleeve terminal; otherwise the
sensitivity will be 6dB lower than is specified! (The same applies to the XLR input: To
connect an unbalanced source via the XLR input, you must connect the signal to Pin
2 and ground both Pin 1 and Pin 3).
Channel A
-12
-15
-18
-9
-6
Protect
Protect
Clip
-21
Power
Power
Signal
-3
-30
-0 0
-0 0
0
0
dB
WARNING: RISK OF HAZARDOUS ENERGY! SEE OPERATING MANUAL.
AVERTISSEMENT: ÉNERGIE ÉLECTRIQUE DANGEREUSE! VOIR LE CAHIER D'INSTRUCTION.
S PE A KO N ™ P I N C O NF I GU RATI O N
TWO CABLES
SINGLE CABLE OUTPUT
BRIDGE CABLE*
1+
1+
1+
2+
(
)
(
)
A / B
(
)
(
)
(
)
(
)
A
B
1+
2+
1–
1–
1–
2–
*SPECIAL CABLE REQUIRED
Channel B
-12
-15
-18
-9
-6
Clip
-21
Signal
-3
-30
-0 0
-0 0
0
0
dB
S PEA KER
OU TPU TS
CIRCUIT
BREAKER
A
A/B BR IDGED
Channel
B
Channel
STEREO: 2 OHMS MIN
BRIDGED: 4 OHMS MIN
1
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