Crown I-T9000 HD, Руководство по эксплуатации

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I-Tech HD Series Power Amplifiers I-Tech HD Series Power Amplifiers
page 6 page 7 Operation Manual Operation Manual
Wire Inputs and Outputs
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 over driven.
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, available from Crown Audio Inc. This is to ensure
compliance with emission regulations.
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.
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.
IEC Power Connector
Slot
Slot
Clip
Choose Input Wire and Connectors
Crown recommends using pre-built or professionally wired, bal anced line (two-conductor plus shield), 22-24
gauge cables and connectors. Use 3-pin male XLR connectors.
Unbalanced line may also be used but may result in noise over long cable runs.
The image below on the left shows connector pin assignments for balanced analog wiring or AES/EBU digital
wiring. The use of standard analog cable with AES/EBU will result in diminished performance. For best results,
110 ohm shielded twisted-pair cable for AES/EBU signals is highly recommended. The image below on the right
shows connector pin assignments for unbalanced analog wiring.
NOTE: Custom wiring should only be performed by qualified per sonnel.
Choose Output Wire and Connectors
Crown recommends using pre-built or professionally wired, high-quality, two- or four-conductor, heavy gauge
speaker wire and connectors. Use Class 2 output wiring. You may use a 4-pole Speakon
®
connector or banana
plugs, spade lugs, or bare wire for your output connectors. To prevent the possibility of short circuits, wrap or
otherwise insulate exposed loudspeaker cable connectors.
CAUTION – SHOCK HAZARD: Potentially lethal voltages exist at the output connectors
when the amplifier is turned on and is passing a signal.
Using the guidelines below, select the appropriate size of wire based on the distance from amplifier to speaker.
Distance Wire Size
up to 25 ft. 16 AWG
26-40 ft. 14 AWG
41-60 ft. 12 AWG
61-100 ft. 10 AWG
101-150 ft. 8 AWG
151-250 ft. 6 AWG
CAUTION: Never use shielded
cable for output wiring.