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2 Setup
2.1 Unpack and Install Your
Amplifier
Please unpack and inspect your amplifier for
any damage that may have occurred during
transit. If damage is found, notify the
transpor tation company immediately. Only you
can ini tiate a claim for shipping damage. Crown
will be happy to help as needed. Save the
shipping carton as evidence of damage for the
shipper's inspection.
We also recommend that you save all packing
materials so you will have them if you ever need
to transport the unit. Never ship the unit
without the factory pack.
YOU WILL NEED (not supplied):
•
Input wiring cables
•
Output wiring cables
•
Ethernet cables
•
Rack for mounting amplifier (or a stable
surface for stacking)
WARNINg: Before you start to set up
your amplifier, make sure you read and
observe the Important Safety Instruc-
tions found at the beginning of this
manual.
page 6
I-Tech HD Series Power Amplifiers
When using an equipment rack, mount units
CAUTION: Before you begin, make sure
your amplifier is disconnected from the
directly on top of each other. Close any open
power source, with the power switch in
spaces in rack with blank panels. DO NOT block
the "off" position and all level controls
front or rear air vents. The side walls of the rack
turned completely down (counterclock-
should be a minimum of two inches (5.1 cm)
away from the amplifier sides, and the back of
wise).
the rack should be a minimum of four inches
Use a standard 19-inch (48.3 cm)
(10.2 cm) from the amplifier back panel.
equipment rack (EIA RS-310B). See
Figure 2.1 for ampli fier dimensions.
Figure 2.2 illustrates standard amplifier airflow.
You may also stack amps without using a
cabinet.
NOTE: When transporting, amplifiers should be
supported at both front and back.
MAGNETIC FIELD
CAUTION! Do not locate sensitive high-gain
equipment such as preamplifiers or tape decks
directly above or below the unit. Because this
amplifier has a high power density, it has a
strong magnetic field which can induce hum
into unshielded devices that are located nearby.
The field is strongest on the right side and right
bottom of the amplifier (facing the amplifier).
If an equipment rack is used, we recommend
locating sensitive equipment at least 20 cm
(8 inches) away from the amplifier.
3.5 In.
8.9 cm
19 In.
Figure 2.2 Airflow
48.3 cm
1.5 In.
3.8 cm
16.2 In.
41.1 cm
Figure 2.1
Dimensions
Operation Manual
I-Tech HD Series Power Amplifiers
2 Setup
2.2 Connecting to AC Mains
WARNINg: The third (ground) prong of the supplied AC power
cord connector is a required safety feature. Do not attempt to
disable this ground connection by using an adapter or other
methods.
Amplifiers don't create energy. The AC mains voltage and current must be
sufficient to deliver the power you expect. You must operate your amplifier
from an AC mains power source with not more than a 10% variation above
or a 15% variation below the amplifier's specified line voltage range and
within the specified frequency requirements (indicated on the amplifier's
back panel label). If you are unsure of the output voltage of your AC mains,
please consult your electrician.
Packed with your I-Tech amplifier is a clip that retains the power cord so it
can't pull out accidentally.
1. Locate the clip in a bag in the I-Tech packing carton.
2. Locate the IEC power connector on the back of the amplifier. Above and
below that connector are two slots. Stretch the ends of the clip and insert
them into the slots (Figure 2.3).
3. Plug the power cord all the way into the amplifier IEC power connector.
4. Pull the clip to the left and snap it onto the power cord.
Slot
Clip
Slot
IEC Power Connector
Figure 2.3 IEC Power Connector Clip
Operation Manual
2.3 Wire Inputs and Outputs
2.3.1 Wiring basics
• Always use shielded wire for input wiring. The higher the density of the
shield (the outer conductor) the better. Spiral wrapped shield is not
recom mended.
• When using unbalanced lines keep the cables as short as possible. Avoid
lengths greater than 10 feet (3 meters).
• Do not run the audio input cables together with the high-level wiring such
as loudspeaker wires or AC cords. (This lessens the chance of hum and
noise being induced into the input cables.)
• Turn the entire sound system off before changing any connections.
Crown is not liable for damage incurred when any transducer or compo nent
is overdriven.
THE CHANNEL 2 INPUT IS IGNORED by default in Bridge Mono mode. It
can be summed using the input source selector and used instead of
Channel 1.
For additional information on audio input wiring please refer to the Crown
Amplifier Application Guide available online at www.crownaudio.com. It
contains helpful information on preventing unwanted subsonic frequen cies,
radio frequency interference, ground loops, and feedback oscillation.
When using network connections, pass the CAT 5 cable five times through a
ferrite core (Figure 2.4), available from Crown Audio Inc. This is to ensure
compliance with emission regulations.
Figure 2.4 Pass the CAT 5 Cable Five Times Through the Ferrite Core
page 7
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