VHD4.21 PASSIVE
OUTPUT
RESIDUAL-CURRENT
CIRCUIT BREAKER
ON
OFF
WARNING - MAINS VOLTAGE
CONNECT ONLY WITH VHD4.21 PASSIVE
USING AN OFFICIAL KV2 AUDIO CORD
WARNING
VERY HIGH ACOUSTIC PRESSURE LEVELS. TO ENSURE PROPER
OPERATION ALLOW A MINIMUM OF 6 INCHES OF CLEARANCE
FROM THIS SURFACE AND ADEQUATE VENTILATION. TO REDUCE
THE RISK OF ELECTRIC SHOCK DO NOT REMOVE THIS PANEL OR
ANY ATTACHED COMPONENT. NO OPERATOR SERVICEABLE
PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL. TO
REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE
THIS APPLIANCE TO RAIN OR MOISTURE.
SERIAL NUMBER
CAUTION
WARNING:
RISK OF ELECTRIC SHOCK
DO NOT OPEN
MAIN INPUT
THROUGH OUT
POWER ON / THERMAL
LIMITER
SIGNAL PRESENT
The VHD4.21 features an easy to use rear control panel featuring audio input and output connections, LED status lights
and residual-current circuit breaker.
VHD4.21 · Control Panel / Inputs and Outputs
VHD4.21 · C
on
tr
ol P
anel
8
Audio signal can be daisy-chained using the through output connector on the input panel. A single source can drive
multiple VHD4.21 subwoofers with a paralleled input loop. If you are driving multiple VHD4.21's in an array, make
certain that the source device can drive the total load impedance presented by the paralleled input circuit of the array.
1) Audio Input and Output
The VHD4.21 uses balanced, female XLR connectors for audio signal input, and a male XLR connector to provide
through output signal. The VHD4.21 features Left and Right stereo inputs and outputs allowing the product to be
integrated into stereo systems that require one subwoofer.
The through output connector, wired in parallel to the audio
input, will continue to provide the input signal if
the VHD4.21 is turned off. The audio input circuit presents
a 20 kOhm balanced input impedance to a three-pin XLR
connector with the following connectors:
The VHD4.21 also features Left and Right High Pass Outputs
that can be used to provide audio signal to full range
speakers being used in conjunction with the VHD4.21.
The high pass filter provides a crossover point of 70Hz.
VHD4.21 Amplifier Control Panel
5
6
7
4
3
1
2
XLR Connectors
Pin 1 - Ground
Pin 2 - Signal (+)
Pin 3 - Signal (-)
Case - Earth (AC) ground and chassis
