3
SECTION II
INSTALLATION PROCEDURES
2-1 UNPACKING
Carefully unpack your Audimax III and examine the unit for any evidence of physical damage
that may have occurred during shipment. In the event of damage file a claim immediately with
the carrier. If future transportation of the unit is anticipated, save the shipping carton for reuse.
2-2 PHYSICAL INSTALLATION
Audimax III is designed to be mounted in a standard 19-inch-wide rack. The unit requires 3-1/2-
inch-high front panel space and is slightly less than 10 inches deep. Install the unit in a
reasonably well-ventilated position making certain that there is no high heat producing
equipment beneath it. The ambient temperature should not exceed 130°F.
2-3 ELECTRICAL INSTALLATION
The Audimax III power supply is equipped with a power transformer permitting the selection of
either 115-volt or 230-volt operation. If 230-volt operation is required, remove the jumper on the
power supply board from lugs 1 to 2 and 3 to 4. Reconnect a single jumper between lugs 2 and
3. Replace the fuse with a type 3AG-0.15 amp fuse.
For broadcast applications, it is recommended that the Audimax III be installed at a studio or
console and its output fed directly into the main audio line. Satisfactory operation requires that
the unit be presented with a constant 600/150-ohm impedance throughout the audio band.
A fast acting peak limiter is recommended for use at the transmitter (following Audimax III).
However, this peak limiter should be set to show only occasional limiting of 2 or 3 dB. For best
results, a CBS Laboratories' Volumax should be used instead of a conventional peak limiter.
NOTE
The master volume indicator should follow Audimax III.
This will discourage unnecessary gain riding which might
tend to defeat the automatic features of Audimax.
2-4 ELECTRICAL CONNECTIONS
Input and output leads should be connected to the five-terminal strip at the rear of the chassis.
Terminals 1 and 2 are the input, and terminals 4 and 5 are the output connections. The unit may
be connected for balanced or unbalanced operation. Terminal 3 is the chassis ground. The
standard Audimax III is delivered for 600-ohm operation. For 150-ohm operation special input
and output pads may be installed and transformers T2 and T3 strapped as shown on the
schematic diagram (see Figure 4.4 and 4.5). The fixed attenuator at the input terminals must
also be removed or converted for 150-ohm operation.
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