AVR 1550 (serv.man4) - Harman Kardon Audio User Guide / Operation Manual. Page 20

20 OPERATION

DOLBY DIGITAL

Available only with digital input sources encoded with Dolby Digital data. It provides 

Center: 0 ms – 5 ms

up to five separate main audio channels and a special dedicated Low Frequency Effects 

Initial Setting – 0 ms

channel.

Surround: 0 ms – 15 ms
Initial Setting – 0 ms

DTS

Available only with digital input sources encoded with DTS data. Available on special 

Delay time not adjustable 

DVD, LD and audio-only discs, DTS provides up to five separate main audio channels and 
a special dedicated low frequency channel.

DOLBY PRO LOGIC II

Dolby Pro Logic II is the latest version of Dolby Laboratory's benchmark surround technology that

Movie and Emulation:

creates or decodes full range, discrete left, center, right, right surround and left surround channels 

10 ms - 25 ms,

from either matrix surround encoded programs and conventional stereo sources. The Dolby 

Initial Setting - 10 ms,

ProLogic II Movie mode is optimized for movie soundtracks that are recorded with matrix 

Music:

surround, by creating true rear left, center and right signals. The ProLogic II Music mode 

0 ms - 15 ms,

should be used with musical selections, that are recorded with matrix surround or with normal 

Initial Setting - 0 ms

stereo mode, creating discrete rear left and right signals. The ProLogic II Emulation mode creates 
compelling five-channel surround from conventional stereo recordings.

DOLBY 3 STEREO

Uses the information contained in a surround encoded or two channel stereo program to 

No surround channels 

create center channel information. In addition, the information that is normally sent to the 
rear channel surround speakers is carefully mixed in with the front left and front right 
channels for increased realism. Use this mode when you have a center channel speaker 
but no surround speakers.

THEATER

The THEATER mode creates a sound field that resembles the acoustic feeling 

Delay time not adjustable 

of a standard live performance theater, with stereo and even pure mono sources.

HALL 1

The two Hall modes create sound fields that resemble a small (HALL 1) or

Delay time not adjustable

HALL 2

medium sized (HALL 2) concert hall, with stereo and even pure mono sources.

5-Channel Stereo

This mode takes advantage of multiple speakers to place a stereo signal at both the front and

No delay is available for 

back of a room. Ideal for playing music in situations such as a party, it places the same signal

this mode

at the front-left and surround-left, and at the front-right and surround-right speakers. The center
channel is fed a summed mono mix of the in-phase material of the left and right channels.

SURROUND

This mode turns off all surround processing and presents the pure left and right 

No surround channels 

OFF (STEREO)

channel presentation of two channel stereo programs.