Wohler ATSC-1, Руководство пользователя

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© 2006 Wohler Technologies Inc. ALL rights reserved
3
INSTALLATION
Mounting
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 considera-
tions 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. The system block diagram located on page 24 may be referred
to for clarification of the general signal paths into and out of the ATSC-1 unit.
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. Unbalanced sources may also be applied to the balanced inputs. The gain is 6 dB greater with a
single-ended source connected across both “hot” terminals than when connected between either input and
common. Note that the unused input terminal of a balanced input should be connected to common, rather than
being left floating, to insure best immunity to noise.
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 overvoltage and overcurrent shutdown. There is no user-replaceable fuse in either the
primary or secondary circuit.