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INSTALLATION AND CONNECTIONS

Multiroom Audio Connections

The AVR 645 is equipped with multizone capabilities
that allow it to send a separate audio source to the
remote zone from the one selected for use in the
main room.

Depending on your system’s requirements, three
options are available for audio connection:

Option 1:

Use high-quality, shielded audio intercon-

nect cable from the AVR 645’s location to the remote
room. In the remote room, connect the interconnect
cable to a stereo power amplifier. The amplifier will be
connected to the room’s speakers. At the AVR 645,
plug the audio interconnect cables into the

Multiroom

Audio Outputs

on the AVR 645’s rear panel.

Option 2:

Connect the

Multiroom Audio Outputs

on the AVR 645 to the inputs of an optional stereo

power amplifier. Run high-quality speaker wire from
the amplifier to the speakers in the remote room.

Option 3:

Taking advantage of the AVR 645’s built-in

seven-channel amplifier, it is possible to use two of the
amplifier channels to power speakers in the remote
room. When using this option, you will not be able to
use the full 7.1-channel capabilities of the AVR 645 in
the main listening room, but you will be able to add
another listening room without external power ampli-
fiers. To use the internal amplifiers to power a remote
zone, connect the speakers for the remote room loca-
tion to the

Surround Back/Multiroom Speaker

Outputs

ﬁ

. Before using the remote room, you will

need to configure the amplifiers for surround operation
by changing a setting in the

MULTIROOM

menu, following the instructions shown on page 46.

NOTE:

For all options, you may connect an optional

IR sensor in the remote room to the AVR 645 via an
appropriate cable. Connect the sensor’s cable to the

Multiroom IR Input

on the AVR 645 and use

the ZR 10 remote to control the room volume. You may
install an optional volume control between the output of
the amplifiers and the speakers in options 1 and 2.

A-BUS

Installation Connections

The AVR 645 is among the few receivers available
that offer built-in A-BUS/

READY

operation. When used

with an optional A-BUS product, you have all the ben-
efits of remote zone operation without the need for an
external power amplifier.

To use the AVR 645 with an approved A-BUS prod-
uct, simply connect it to the AVR 645 using standard
Category 5 wiring that is properly rated for the specific
in-wall installation. Terminate the wiring at the receiver
end to a standard RJ-45 connector in compliance
with the instructions furnished with the A-BUS product.

No further installation or adjustment is needed, as the
A-BUS jack on the AVR 645 routes the signals to their

proper destination for power, signal source and control.
The output fed to the A-BUS jack is determined by the
AVR 645’s multiroom system and menus.

RS-232 Connections

The AVR 645 is equipped with an

RS-232 Serial

Connection Port

that may be connected to a

compatible, optional, external computer, keypad or
control system for bidirectional communications that
enable the external system to control the AVR, and for
the AVR to report status and handshake data back to
the controller. Use of the RS-232 port for this type of
control requires specific technical knowledge, and we
recommend that any connection and programming for
control be made by a trained installer or technician
familiar with the equipment being used.

The physical connection to the AVR 645’s RS-232
port is a standard D-SUB 9 connection, but to ensure
compatible and proper operation, specific software
commands and pin wiring schemes may be required.

USB Connections

The AVR 645 is one of the few A/V receivers to offer
a USB connection that may be used for both playback
of compatible audio content from a computer and for
loading of system updates (when available).

The physical connection between a computer and the
AVR is a simple one, requiring only a cable with a USB
“A” type connector on one side and a USB “Mini B” on
the other.

Connect the larger, “A” connector on the cable to your
computer or a USB hub and the end with the “Mini”
USB connector to the

USB Port

on the AVR’s rear

panel.

NOTES ON USB:

• The USB port on the AVR 645 is for connection to

a computer, or to a hub connected to a computer,
only. DO NOT connect it directly to other devices
such as card readers, USB memory storage devices,
external hard drives, USB accessories, digital cameras
or cellular phones. Connection to these devices may
cause damage to the device and/or the AVR that is
not covered by the AVR’s warranty.

• The AVR 645’s USB connection may only be used

for audio playback and system upgrades. It may not
be used for other purposes, such as system control,
video or still-image playback.

Trigger Connection

The AVR 645 is equipped with a low-voltage trigger
that may be used to control a wide variety of compati-
ble, optional devices that respond to voltage actuation
commands. This includes external audio power amplifiers,
video screens, motorized blinds and other compatible
products in a home theater or automation system.

Due to the complexity of interfacing with power-
controlled devices, we strongly recommend that
they be installed by a qualified professional.

The trigger jack delivers 5 volts DC when activated,
and remove the voltage when they are off. The con-
nection is a 3.5mm mono mini plug with the signal on
the center pin (“tip”) and the outer shaft (“ring”) acting
as the negative or ground connection.

The

Trigger Output

is for use with devices such as

power amplifiers that you wish to activate whenever the
AVR is turned on, regardless of the input selected.

After checking for voltage, current and polarity com-
patibility between the device being controlled and the
AVR, simply connect one end of the trigger cable to
the device being controlled and the other end to the

Trigger Output

on the AVR.

IMPORTANT NOTE ON THE TRIGGER CONNECTION:

The current draw from the trigger jack cannot
exceed 1.0mA.

XM Radio Connections

XM Radio is a satellite-delivered, subscription-based,
programming service that provides a wide range of
music, sports, news and information programming with
digital audio quality. The AVR 645 is XM Connect and
Play-ready, which means that you can easily add the
XM service to your home audio system by purchasing
an XM antenna module or Passport system, activating
an account with XM and then making a simple, single-
cable connection to your AVR.

To purchase an XM antenna module or Passport
system, consult your dealer, or contact XM Radio at
www.xmradio.com. After following the instructions
packed with the module, place the XM antenna near
a south-facing window and run the cable to the AVR.
Connect the plug at the end of the cable to the

XM-

Ready Module Input

. If you are using an XM

Passport system, remember that the Passport card
must be inserted for the system to operate. Once the
connection is made, follow the instructions on page 41
for more information on listening to XM Radio.

NOTES on XM Radio:

• XM Radio requires the purchase of additional,

optional hardware and a separate subscription to
the XM service.

• XM Radio is available only in the continental United

States and Canada. It is not available in Alaska
or Hawaii.

• XM reception requires that the antenna be able to

“see” the XM satellites or receive a signal from one
of the XM ground-based repeaters. Depending on
your installation and location, XM service may not
be available in some areas.

AC Power Connections

This unit is equipped with an accessory AC outlet
that may be used to power accessory devices, but it
should not be used with high-current draw equipment
such as power amplifiers. The total power draw may
not exceed 100 watts.

INSTALLATION AND CONNECTIONS 19

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