Manual Harman Kardon AVR254 (page 42 of 76) (English)

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ADVANCED FUNCTIONS

Much of the AVR 254’s performance is handled automatically, with little

intervention required on your part. However, the AVR 254 is a sophisti-

cated component, and is capable of being customized to suit your

particular system and your tastes. In this section we describe some of

the more advanced adjustments available on the AVR 254. You may

return to this section later, when you have become more familiar with

your receiver.

Audio Processing and Surround Sound

Audio signals output by sources are encoded in a variety of formats that

can affect not only the quality of the sound but the number of speaker

channels and the surround mode. You may also manually select a

different surround mode, although for certain types of audio signals,

the modes available will be limited in certain ways, as described below.

Analog Audio Signals

Analog audio signals usually consist of two channels – left and right.

The AVR 254 offers three basic options for playback of analog audio:

Analog Bypass Mode: In this mode, the 2-channel signal is passed

directly from the input to the volume control, without being digitized

or undergoing any processing for bass management or surround

sound. The requirements for selecting analog bypass mode are:

a) The analog audio inputs for the source must be selected. If neces-

sary, press the Info Button on the remote and use the

⁄

Buttons to scroll to the Audio Source setting, then select an

analog input.

b) The tone controls must be disabled by setting Tone Control to Off.

Press the Audio Effects Button to access the Tone Control setting

in the Audio Effects submenu.

c) The 2-channel Stereo mode must be selected. Press the Surround

Modes Button to access the STEREO line of the Surround Modes

submenu.

When the Tone Control setting is Off, the front speakers will be set to

Large automatically, as indicated by the double boxes in their positions

in the Speaker/Channel Input Indicators on the front panel. That indi-

cates that Analog Bypass mode is active. When the Tone Control setting

is turned On, if you have set the front speaker crossover to a numeric

setting, the front speakers will return to the Small setting, as indicated by

single boxes in the Speaker/Channel Input Indicators. When the front

speakers are Small and 2-Channel Stereo mode has been selected in

the Surround Modes submenu, DSP Surround Off mode is active.

DSP Surround Off Mode: The DSP Surround Off mode digitizes the

incoming signal and applies the bass management settings, including

speaker configuration, delay times and output levels. This mode is

desirable when your front speakers are small, limited-range satellites

and you are using a subwoofer. To select this mode, use a digital

audio input, or turn the Tone Control setting off.

Analog Surround Modes: One of the main benefits of a surround

receiver such as the AVR 254 is its ability to process 2-channel

audio signals to produce multichannel surround sound in a variety

of modes, even when no surround sound has been encoded in the

recording. Among the available modes are the Dolby Pro Logic II/IIx

modes, the Dolby Virtual Speaker modes, the DTS Neo:6 modes, the

Logic 7 modes, and the Stereo modes.

Digital Audio Signals

Digital audio signals offer the benefit of greater capacity, which allows

recording artists to encode center and surround channel information

directly into the signal. The result is improved sound quality and startling

directionality, since each of these channels is reproduced discretely.

Alternatively, the artist may encode only two channels, but the digital

signal allows for a higher sampling rate that delivers greater detail.

High-resolution recordings usually sound extraordinarily distortion-free

at all frequencies, but especially at high frequencies.

Multichannel digital recordings usually are found in the 5.1-, 6.1- or

7.1-channel formats. The channels included in a 5.1-channel recording

are front left, front right, center, surround left, surround right and LFE.

The LFE channel is denoted as “.1” to represent the fact that it is not

full-range, being limited to the low frequencies.

6.1-Channel recordings add a single surround back channel, and

7.1-channel recordings add surround back left and surround back

right channels to the 5.1-channel configuration. New formats, such

as Dolby TrueHD, Dolby Digital Plus, DTS-HD and DTS-HD Master

Audio, are available in 7.1-channel configurations. The AVR 254 is

able to play the new audio formats, delivering a more exciting home

theater experience.

NOTE: To use the 6.1- and 7.1-channel surround modes, the

AVR 254 must be configured so that the Surround Back channels

are enabled. See the Manual Setup section on page 46 of the

Advanced Functions section for more information.

Digital formats include Dolby Digital 2.0 (two channels only), Dolby

Digital 5.1, Dolby Digital EX, Dolby Digital Plus, Dolby TrueHD, DTS-HD,

DTS-HD Master Audio, DTS 5.1, DTS-ES (6.1 Matrix and Discrete),

DTS 96/24, 2-channel PCM modes in 32kHz, 44.1kHz, 48kHz

or 96kHz, and 5.1 or 7.1 multichannel PCM.

When a digital signal is received, the AVR 254 detects the encoding

method and the number of channels. The number of channels encoded

will appear briefly in the front-panel display as three numbers, separated

by slashes (e.g., “3/2/.1”).

The first number indicates the number of front channels in the signal:

“1” represents a monophonic recording, usually an older program that

has been digitally remastered or, more rarely, a modern program

for which the director has chosen a special effect.

“2” indicates the presence of the left and right channels, but no

center channel.

“3” indicates that all three front channels (left, right and center)

are present.

AVR254om.qxd 3/28/08 12:46 PM Page 42

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Harman Kardon AVR254 Manual

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