Volume And Tone Control; Surround Mode Selection; Digital Audio Playback - Harman Kardon AVR 645 Owner's Manual

nternal bass-management system. When this input
is in use, the analog source is converted to digital
so that you may use the same bass-management
options for the direct input as are used for all other
inputs. This input also mutes the unused input jacks
to prevent unwanted noise from interfering with
system performance.
• The 8 CH DIRECT input should be used
when an input is connected to all eight 8-Channel
Direct Inputs and when the input source device
has its own internal bass-management system. This
input passes the input from the source directly
through to the volume control without any analog-
to-digital conversion.
• The 8 CH DVD AUDIO input should be used
when an input is connected to all eight 8-Channel
Direct Inputs and when the input source does
not have its own internal bass-management system.
When this input is in use, the analog source is con-
verted to digital so that you may use the same
bass-management options for the direct input as
are used for all other inputs.

Volume and Tone Control

• Adjust the volume to a comfortable level using the
front-panel Volume Control ) or remote Volume
˙.
Up/Down Buttons
• To temporarily silence all speaker outputs, press the
ß. This will interrupt the out-
Mute Button
put to all speakers and the headphone jack, but it
will not affect any recording or dubbing that may be
in progress. When the system is muted, the word
MUTE will flash in the on-screen display (except
when 720p or 1080i sources are in use) and
Upper Display Line #; press the Mute Buttons
ß again to return to normal operation.
• The unit's tone controls may be taken out of the
signal path by pressing the Tone Mode Button
C
. The first button press will show a message
in the on-screen display (except when 720p or
1080i sources are in use) and Lower Display Line
$ with the current status of the tone controls. The
system default is TONE IN, which indicates that
the bass and treble controls are active. Press the
© on the
/ Navigation Buttons
⁄ ¤
Buttons H on the front
remote control or the /
‹ ›
panel to change the setting to TONE OUT,
which is "flat" response without the tone controls
being active.
• When the tone controls are active, the amount of
bass and treble boost/cut may be adjusted up to
±12dB in 2dB steps by pressing the Tone Mode
Button C
two or three times until the desired
setting (BASS MODE or TREBLE
MODE) appears in the on-screen display and in
the Lower Display Line $. Next, use the
© on the remote
/ Navigation Buttons
‹ ›
or the / Navigation Buttons on the front panel
‹ ›
H to change the setting as desired. The unit will
return to normal operation within five seconds after
the setting is changed.
• For private listening, simply place a standard
1/4" stereo headphone plug or adapter into the
Headphone Jack B behind the door 9 on the
front panel. The speakers will automatically mute
and a two-channel stereo signal will be sent to the
headphones. The Lower Display Line $ will read
DOLBY H: BP, indicating that the headphone
output is in the Bypass mode, and to confirm that
no processing is being used. To listen through the
headphones using the Dolby Headphone mode,
simply press the buttons on the remote or front
panel as shown below for changing a Dolby mode.
DOLBY H: DH will appear in the Lower
Display Line when the Dolby Headphone mode
is in use.

Surround Mode Selection

One of the most important features of the AVR 645
is its ability to reproduce a full multichannel surround
sound field from digital sources, analog matrix
surround-encoded programs and standard stereo
programs.
Selection of a surround mode is based on personal
taste, as well as the type of program source material
being used. For example, motion pictures or TV pro-
grams bearing the logo of one of the major surround-
encoding processes, such as Dolby Surround or DTS
Stereo may be played in either the Dolby Digital,
Dolby Pro Logic II Cinema, DTS Neo:6 Cinema, or
Logic 7 Cinema surround modes, depending on the
source material.
NOTE: Once a program has been encoded with matrix
surround information, it retains the surround information
as long as the program is broadcast in stereo. Thus,
movies with surround sound may be decoded via any
of the analog surround modes such as Dolby Pro Logic
II Cinema, Logic 7 Cinema or DTS Neo:6 Cinema, when
they are broadcast via conventional TV stations, cable,
pay-TV and satellite transmission. In addition, a growing
number of made-for-TV programs, sports broadcasts,
radio dramas and music CDs are also produced in sur-
round sound. You may view a list of these programs at
the Dolby Laboratories Web site at www.dolby.com.
Even when a program is not listed as carrying inten-
tional surround information, you may find that the Dolby
Pro Logic II, Dolby Pro Logic IIx, Logic 7 or DTS Neo:6,
and the Hall or Theater modes often deliver enveloping
surround presentations through the use of the natural
information present in all stereo recordings.
Surround modes may be changed at any time by
using either the front panel or remote control. To
OPERATION
select a new surround mode from the front panel, first
press the Surround Mode Group Selector Button
2 until the desired major surround mode group such
as Dolby, DTS or Logic 7 is selected. Next, press the
Surround Mode Selector Button 3 to choose the
specific individual surround mode.
To choose a surround mode using the remote, first
press the button for the major surround mode group
that includes the mode you wish to select. These
buttons are the Dolby Mode Select Button
the DTS Digital Model Select Button
DTS Neo:6 Mode Select Button
Surround Mode Select Button
Mode Select Button . The first press of a button
will show the current mode from that group if it is
already in use, or the first available mode if you are
currently using another mode. To cycle through the
available modes in that group, press the button again
until the desired mode appears in the Lower Display
Line $, the on-screen display (when a 480i source
is in use) and the front-panel Surround Mode
Indicators %.
The Dolby Digital, Dolby Digital EX, DTS 5.1, DTS-ES
Matrix and DTS-ES Discrete modes may only be
selected when a digital input is in use. In addition,
when a digital source is present, the AVR 645 will
automatically select and switch to the correct mode,
regardless of the mode that has been previously
selected. For more information on selecting digital
sources, see the Digital Audio Playback section below.
When the 6-channel/8-channel direct inputs are in
use, there is no surround processing, as these inputs
take the analog output signals from an external source
device and carry them straight through to the volume
control without any further digital processing.
To listen to a program in traditional two-channel
stereo, using the front left and front right speakers
only (plus the subwoofer, if installed and configured),
press the Stereo Mode Select Button
SURROUND OFF appears in the Lower Display
Line $. From the front panel, press the Surround
Mode Group Selector 2 until the Stereo modes
appear in the on-screen display and Lower Display
Line $. Next, press the Surround Mode Selector
Button 3 until SURROUND OFF appears in
the on-screen display and Lower Display Line $.

Digital Audio Playback

Digital audio is a major advancement over older analog
surround processing systems. It delivers up to six dis-
crete channels, and each channel reproduces a full-fre-
quency range (20Hz to 20kHz) and offers dramatically
improved dynamic range and significant improvements
to signal-to-noise ratios. In addition, digital systems have
the capability to deliver an additional channel that is
specifically devoted to low-frequency information. This is
OPERATION OPERATION
,
, the
, the DSP
and the Stereo
until
37 37