VX-03 ELECTRONIC CROSSOVER
INTRODUCTION
The VX-03 is a stereo 3-way, mono 4-way crossover. These high-quality crossover networks are designed to
extract maximum sound quality from your multi-amped sound system at a price working musicians can afford.
Accurate state-variable, 18 dB/octave butterworth filters prevent peaks or dips in the output at crossover points,
ensuring good driver protection by rolling off crossover frequencies rapidly.
A two-pole, high-pass filter may be electronically inserted at 40 Hz using a switch on the front panel, and a
variable low frequency summed output is available for mono subwoofer applications.
The rear panel of the VX-03 is clearly labeled for stereo and mono operation, and all outputs on the VX-03
except the mono low frequency sum output include phase switches.
INSTALLATION
Install the crossover in a rack. Route the AC power cord away from audio lines and plug into a convenient outlet
connect audio lines to the crossover using the appropriate input jacks to channels 1 and 2 (for stereo operation),
or to channel 1 only (for mono operation). Connect the appropriate output jacks for stereo 3-way, mono 4-way
operation. The rear panel is clearly marked for proper connection. Follow the top labels for stereo connection or
the bottom labels for mono connection.
All inputs and outputs are balanced.
The VX-03 may be connected balanced or unbalanced. Input impedance is 40K ohms, and output impedance is
102 ohms.
Once the crossover is installed, adjusted, and tested, an optional security panel may be secured to the front panel
of the unit to prevent tampering.
SETUP
Consult your speaker and driver manufacturer's specifications for the recommended crossover frequencies.
Basic setup procedures for the crossovers are follows:
Label each power amplifier for its respective frequency band.
VX-03: LOW, MID, or HIGH for stereo operation; LOW,LOW-MID,HIGH-MID or HIGH for mono operation
Set each power amplifier volume control at maximum and connect each power amplifier output to its correct
speaker or driver.
Apply power to the crossover. DO NOT TURN ON THE POWER AMPLIFIERS YET.
STEREO OPERATION
Using the markings in the top row of the front and rear panels, set each channel as follows:
Set the gain control to 0dB. Set all level controls to -
∞
and switch in the 40Hz highpass filter desired.
VX-03: Set the LOW/MID crossover frequency for each channel according to the front panels markings.
VX-03: If the desired frequency is above 500Hz, the range switch must be engaged (LED indicator lit). If the
desired frequency is below 500Hz, the range switch must be disengaged (LED indicator off).
When the range switch is engaged, the frequencies marked around the LOW/MID frequency control are
multiplied by ten. In other words, if the LOW/MID frequency is set at 250 and the range switch is engaged, the
actual crossover frequency is 2.5Khz.
VX-03: Set the MID/HIGH crossover frequency. The channel A MID/HIGH frequency control has two sets of
markings. When using the crossover in stereo mode, use the lower frequency markings to set the MID/HIGH
crossover point. This frequency control has no range switch, and in stereo mode extends to 7.5kHz.
Send a broadband signal into the crossover and slowly bring up the LOW level control. Set the control for the
desired level. The gain control can be used to SKP the if needed.
VX-03: Apply power to the MID frequency amplifier and turn up the MID level control to the desired level.
VX-03: Finally, apply power to the HIGH frequency power amplifier and bring up the HIGH level control to the
desired level.
Once the output levels are set, any phase problems can be corrected with the phase inversion switches on the
real panel. THE PHASE INVERSION SWITCHES ON THE VX-03 ARE MECHANICAL SWITCHS AND SHOULD
ONLY BE CHANGED. WHEN THE POWER AMPLIFIER FOR THAT OUTPUT IS OFF. Turning down the level
controls on the VX-03 will not prevent transients from appearing at the outputs when changing the phase
