Stereo Mode; Bridge Mode - YORKVILLE VTC Pro Audio V42 Manuel De L'utilisateur

3. Remote Referencing
You can approach balanced performance with unbalanced sources by utilizing the re-
mote reference feature of the V42/V44. Connect a balanced cable to the V42/V44 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 V42/
V44'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 V42/V44.
4. Driving Multiple V42/V44's
In large installations it is often desirable to operate many amplifiers in tandem. Since each chan-
nel'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 VTC Pro Audio V42/V44 can be configured for dual-MONO, STEREO or BRIDGED operation
via the rear panel MODE switch. The following is a description of each mode:

Bridge Mode

2
NOTE: These patch cords MUST be balanced whether the input signal is bal-
anced 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 & 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™ connectors on each channel.

Stereo Mode

• Two independent amplifiers, Amp A and Amp B.
• Two loads are driven.
• Loads are connected to the Speakon™ connectors on each channel.
• Channel A & B inputs are paralleled. GAIN B control has no effect.
• Output signals are equal in amplitude but opposite in phase.
• One load is driven.
• The load is connected between the pins 1+ and 2+ on the Speakon™ connector on channel A.