VDSCO1
HQPOWER
4
4. Mounting and Installation
The
VDSCO1
is designed for standard 19” rack mounting using the included screws.
Route the power cord away from any audio lines and plug into a convenient mains socket. Connect the audio lines to
the
VDSCO1
using the appropriate input jacks (L/R for stereo operation, L only for mono operation). Connect the
appropriate output jacks for stereo 2-way or mono 3-way operation: follow the top labels on the rear panel for stereo
operation and follow the bottom labels for mono operation.
•
Balanced Connection
Wire stereo ¼” connectors as follows:
Tip: high
Ring: low
Barrel: ground
•
Unbalanced Connection
Wire mono ¼” connectors as follows:
Tip: high
Barrel: ground
Note that the ¼” plugs may be connected as balanced or unbalanced.
5. Operation
•
Stereo Operation
Refer to the top labels on the rear panel.
Set the gain control to 0dB and switch on the 40Hz high-pass filter if desired. Set the LOW/HIGH crossover
frequency for each channel according to the front panel markings. If the desired frequency is above 960Hz, engage
the range switch (LED indicator lights). If the desired frequency is below 960Hz, then the range switch must be
disengaged (LED indicator off). When the range switch is engaged, the frequencies marked around the low/high
frequency control are decupled, i.e. if the frequency is set to 250 and the range switch is engaged, the actual
crossover frequency will 2.5kHz. Set the LOW/HIGH crossover frequency. This frequency can be set from 45Hz to
9.6kHz. Connect the outputs of the crossover to the appropriate amplifiers.
The power amplifiers should be
unpowered when connecting.
Check to see that all crossover level controls are set to -8dB and that both gain
controls are set to 0dB. Apply power to the low frequency amplifier. Set a broadband signal into the crossover and
slowly bring up the LOW level control. Set the control to the desired level. The gain control can be used to boost the
signal is needed. 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 rear panel.
The phase inversion switches are mechanical switches and should only be
operated when the power amplifier for that output is switched off.
Turing down the level controls on the
VDSCO1
will not prevent transients from appearing at the outputs when changing the phase switches while the
crossover is on. These transients can damage the power supply.
•
Stereo Operation Using a Mono Subwoofer
This operation mode provides high-frequency outputs for channels 1 and 2, and one low frequency summed output.
The setup procedure is analogous to the stereo operation setup except that instead of connecting both low frequency
outputs, only the low frequency summed output must be connected to the low frequency amplifier. Set both LOW
level controls to the same level to ensure that both controls contribute the same amount of signal to the low
frequency summed output.
Summary of Contents for HQ POWER VDSCO1
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