© 2001 Wohler Technologies Inc. ALL rights reserved
9
AMP2-V2DA User Manual P/N 821539 Rev-A
Installation
Section 2: Operation
Mounting
NOTE:
Be sure to set the level meter Gain Calibration and Display Mode DIP switch (accessed through the top cover) and Input
Termination and Input Gain Calibration (accessed through the rear panel), BEFORE installing the unit into an enclosed rack or
console. See pages 14 and 22 for setting information.
The unit should be mounted where convenient for operating persons, ideally at approximately ear level for best high frequency
response. Its superior magnetic shielding eliminates concerns about locating it adjacent to most types of CRT monitors, including
even high-resolution color monitors.
Heat Dissipation
Heat dissipated by the speaker amps is conducted directly to the left side of the chassis; no special considerations for cooling are
necessary as long as the ambient temperature inside the rack area does not exceed approximately 40°C (104°F).
Sympathetic Vibration
Sympathetic vibration from other equipment (cables, etc.,) in the rack may be serious enough to interfere with the unit’s sound
quality out in the listening area. The use of thin card stock and/or felt or foam weather-stripping type materials between adjacent
vibrating surfaces, or tying up loose cables, etc., may be required to stop vibrations external to the unit.
Mechanical Bracing
Even though the unit is fairly heavy, the chassis is securely attached to the front panel at eight points along its surface, not just at
the four corners of the chassis ears. This feature will reduce or eliminate rear bracing requirements in many mobile/portable
applications. The weight of internal components is distributed fairly evenly around the unit.
Audio Connections
Connection of the audio feeds is straightforward. Please refer to the system interconnect block diagram on page 24 for clarifica-
tion of the general signal paths into and out of the AMP2-V2DA unit.
AES/EBU inputs are via either female BNC or 3-pin female XLR connectors. Digital BNC inputs are 75
Ω
unbalanced; digital
XLR inputs are 110
Ω
balanced. Analog inputs are via four 3-pin Phoenix screw-clamp connectors. Analog inputs are 200K
Ω
balanced. Care should be exercised to avoid mismatched cable types and other similar causes of undesired reflections in RF signal
systems. If severe enough, such reflections can result in corruption of the digital datastream.
Electrical Interference
As with any audio equipment, maximum immunity from electrical interference requires the use of shielded cable; however,
satisfactory results can sometimes be obtained without it. The internal circuitry common is connected to the chassis.
AC Power
The unit's AC mains connection is via a standard IEC inlet, with safety ground connected directly to the unit's chassis. The
universal AC input (100-240VAC, 50/60Hz) switching power supply is a self-resetting sealed type, with automatic over-voltage
and over-current shutdown. There is no user-replaceable fuse in either the primary or secondary circuit.
