Owner's manual

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I-Tech HD Series Power Ampliﬁers I-Tech HD Series Power Ampliﬁers

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Operation ManualOperation 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

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.