AVR 80 (serv.man3) - Harman Kardon Audio User Guide / Operation Manual. Page 37

Advanced Features

31

DOLBY PRO LOGIC

Dolby Pro Logic is the standard mode for surround sound decoding. It uses information 

15 ms – 30 ms

encoded in a two channel stereo recording to produce four distinct channels: 

Initial Setting = 20 ms

Left, Center, Right and Surround. Use this mode for accurate reproduction of programs 
bearing the Dolby Surround, DTS Stereo, UltraStereo or other “Surround” logos. 
Surround encoded programs include videocassette and LD movies, TV and 
cable programs, radio programs and audio CDs. Dolby Pro Logic processing 
may also be used to provide a pleasing surround effect with some source material that 
does not carry surround encoding.

THX CINEMA

THX Cinema is a patented process developed by Lucasfilm Ltd. as an enhancement 

15 ms – 30 ms

to surround processing. It includes additional enhancements that greatly improve 

Initial Setting = 20 ms

the spectral and spatial realism of motion pictures that are recorded with the same 
usual surround encoding as for DOLBY PRO LOGIC. THX Cinema’s exclusive 
processing is designed to overcome the differences in acoustics between movie 
theaters and home listening rooms so that movie sound tracks will sound the same 
way at home as they did in the mixing room where they were created. 

DOLBY 3 STEREO

Dolby 3 Stereo uses the information contained in a surround encoded or stereophonic 

No Surround Channels

program to 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 right channels for increased realism. Use this mode when you have a center 
channel speaker, but no surround speakers.

MOVIE SURROUND

Movie Surround uses decoding similar to Pro Logic, but it permits delay 

10 ms – 90 ms

times up to 90 ms. Use this mode instead of Pro Logic or THX to experiment with 

Initial Setting = 20 ms

surround times above 30 ms, or if the delay time formula suggests a 
larger time delay for your room.

HALL SURROUND

This mode is designed for use with stereo recordings. It provides a sound field effect that 

10 ms – 90 ms

simulates the complex combination of direct and reflected sounds that create 

Initial Setting = 20 ms

the rich reverberant atmosphere of a medium sized circular concert hall.

MATRIX SURROUND

This mode is designed for use with sports broadcasts, live concerts or other programs 

10 ms – 90 ms

where the feeling of a wide surround effect is desired.

Initial Setting = 20 ms

MONO

This mode is intended for use with old music or movies, televisions shows and other  

No Surround Channels

programs that have only monaural sound track. All sound will be reproduced through 
the center channel speaker, if installed. If there is no center channel speaker, 
monaural sound is reproduced from the front left and right speakers.

STEREO

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

No Surround Channels

channel presentation of two channel stereo programs.

Surround Mode Chart

AVR80 manual  11/01/98 13:01  Side 31