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4.
CABLE REQUIREMENTS
4.1
Input Cables
Be sure to use shielded cable whether balanced or
unbalanced. Shielding which is properly grounded will
protect the signal from outside electrical interference such
as RF, fluorescent lighting, and computer/display emis-
sions. As a general rule, unbalanced or single-ended (tip-
sleeve) lines of less than 10 feet are satisfactory, but greater
distances or noisy field environments require a balanced
signal. Avoid running input lines in close proximity or
parallel to long speaker lines, AC power cables, or power
transformers, as this may generate hum or oscillation.
4.2
Output Cables
It is recommended that the 70V speaker lines be
terminated with spade lug terminals for connection to the
powerflex amplifier's output screw terminals. Alterna-
tively, bare stripped wire leads may be wrapped around
the output screw terminals. The output screw terminals
will accept spade lugs or stripped wire for wire sizes 10 to
22 gauge.
C
: T
P
AUTION
HE
ERS CAN PRODUCE DANGEROUS VOLTAGE LEVELS AT
THE OUTPUT SCREW TERMINALS
THE AMPLIFIER BEFORE CONNECTING OR DISCON
. T
NECTING OUTPUT WIRES
ALWAYS BE OPERATED WITH THE SCREW TERMINAL
SAFETY COVER SECURELY IN PLACE
Operating Manual - Powerflex Multi-Channel 70V Power Amplifier
70V
OWERFLEX
AMPLIFI
. A
LWAYS UNPLUG
HE AMPLIFIER SHOULD
.
5.
RACK-MOUNTING REQUIREMENTS
5.1
Mechanical
Powerflex amplifiers are designed to fit in stan-
dard 19-inch equipment racks. The front panel rack-mount
ears are sufficiently strong for most applications, however
if you desire further support, we recommend using the four
additional holes in the back of the chassis for supplemen-
tal rear-mounting (see dimensional drawing for details).
5.2
Cooling
Be certain that both the front and back of the rack
have unhindered access to free air flow. Fan direction is
from front to back. It is not necessary to leave empty space
above or below.
5.3
Grounding
In some installations where the sound system is
sensitive to RF noise or system-induced oscillation, it may
be necessary to ground the amplifier's chassis to the rack
enclosure. This is accomplished using star type
lockwashers on the four rack mounting screws. These star
washers will penetrate through the amplifier's paint to ad-
-
equately ground the chassis to the rack.
-
5
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