Kramer Electronics VM-1610 - Manual (Page 11)

INSTALLATION
6.1 Rack Mounting
The VM-1110 and VM-1610 amplifiers may be rack mounted in a standard 19” EIA rack assembly,
and include rack “ears” at the ends of the front panel. Each of these devices uses one unit (1U) of rack
height, 1.75", and does not require any specific spacing above or below the unit for ventilation. To
mount these amplifiers, simply place the unit against the rails of your rack, and insert standard screws
through each of the four corner holes in the rack ears. The VM-80A and VM-5AD amplifiers require
a special (see section 4.1) rack adapter (contact your KRAMER dealer) to be mounted in the 1U rack.
For installation of the VM-80A and VM-5AD, follow the instructions, in the installation guide,
enclosed with the adapter.
CONNECTING TO AUDIO DEVICES
Audio sources and output devices (such as amplifiers or recorders) may be connected to the amplifier
through the female XLR type connectors ( VM-1110 and VM-5AD models), or through terminal
block type connectors ( VM-1610 and VM-80A models) located at the back of the machine.
USING THE VM AUDIO AMPLIFIERS
8.1 Powering On The Amplifier
NOTES
1. The amplifier should only be powered on after all
connections are completed and all source devices have been
powered on. Do not attempt to connect or disconnect any
audio or control signals to the amplifier while it is powered
on!
2. The socket-outlet should be near the equipment and
should be easily accessible. To fully disconnect equipment,
remove power cord from its socket after turning it off.
1. Press the toggle switch (on the far-left of the front panel) to the up position. The toggle switch
illuminates and the configuration button illuminates as well (where applicable).
2. Operate the acceptors.
8.2 Coupling
The coupling implemented in the amplifiers described in this manual is AC.
8.3 Audio Control (VM-1610/80A Only)
Using a flat screwdriver, gently adjust the GAIN trimmers of the appropriate RIGHT or LEFT
channels, located at the front of the machine, for satisfactory audio level.
8.4 Balanced\Stereo Control (VM-5AD Only)
Balanced audio is a signal that is divided into two antiphase signals, traveling on two wires (and
sometimes with a third - a ground reference wire). Transmitting a balanced signal achieves a better
signal-to-noise ratio, and the signal is more immune to noise and interference. On the receiving end
there is a differential amplifier, which amplifies only the difference between the antiphase signals,
thus canceling noise which is picked up along the way. The balanced system is usually used either
when very low signals are to be transmitted over long distances (such as those generated from high
quality microphones) or at broadcast audio studios, for highest quality signal recreation. To enable
stereo audio control, select the “Stereo” position by pressing the Stereo/BAL pushbutton to the "In"
position. Then gently adjust the Level R/Level L Gain knobs to control the appropriate channel audio
gain for satisfactory audio level. To enable balanced audio level control, select “ BAL” position by
releasing the Stereo/BAL pushbutton to the "Out" position. Then using the LEVEL L/BAL knob
gently adjust the audio stereo level for satisfactory audio level.