VTC Pro Audio V64 Manuel De L'utilisateur page 4

3. Remote Referencing
You can approach balanced performance with unbalanced sources by utilizing the remote reference feature of the V64.
Connect a balanced cable to the V64 just as you would if you were running a balanced line. At the other end, connect
Pin 3 and Pin 1 together, (or connect ring to sleeve if you are using a PHONE plug cable), and plug this modified end
into your unbalanced piece of equipment. This connection enables the V64' s input to look down the cable directly at the
output jack of the unbalanced equipment. Any hum voltage generated across the cable' s impedance will be attenuated
by the common mode rejection of the V64.
4. Driving Multiple V64's
In large installations it is often desirable to operate many amplifiers in tandem. Since each channel' s XLR input is internally
paralleled with its phone input, you may use the remaining input jack as an output to the next amplifier. Obviously you will
need both XLR to XLR and PHONE to PHONE patch cords if you are going to tandem more than two amplifiers.
5. Ground Switch
Switching the ground switch on the rear panel will disconnect chassis ground from circuit ground. Safety
(earth) ground is still connected to the chassis. We do not recommend lifting the ground strap unless you are
experiencing problems with ground loop hum in multiple amplifier setups where lifting the ground straps of all
but one amplifier cures the hum problem.
6. Modes
The V64 can be configured for dual-MONO or STEREO operation via the rear panel MODE switch. The following is a
description of each mode:
7. Subsonic Filter Switch
The V64 features a specially designed subsonic filter which effectively blocks potentially destructive energy in
the band below 40 Hz. The filter provides a 12 dB/octave. skirt below 40 Hz. It is implemented with a two pole
network designed to minimize phase shift down to 40 Hz. We recommend using this filter in conjunction with some
subwoofers and with all high power full range cabinets. With the filter disabled, the V64 is flat down to 20-Hz, and
rolls off at 12dB/Oct below that.
2
NOTE: These patch cords MUST be balanced whether the input signal is balanced
or unbalanced!
CAUTION: Sometimes hum problems are an indication of improper AC wiring
somewhere else in your system. Don't just doctor the symptom by lifting grounds. Fix
the cause by making sure that the proper electrical wiring safety regulations have
been adhered to.
Mono Mode
• Channel A and B inputs are paralleled.
• Each gain control adjusts the signal level for its respective channel,
• Output signals are of equal phase.
• Two loads are driven.
• Loads are connected to the Speakon™ on each channel.
Stereo Mode
• Two independent amplifiers, Amp A and Amp B.
• Two loads are driven.
• Loads are connected to the Speakon™ on each channel.