Yamaha YSP-2500 Owner's Manual

APPENDIX

➤ Basic Knowledge of Surround Sound

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Surround sound offers the sense of being surrounded by sounds, an 
experience common in concert halls and movie theaters. This can be 
achieved by surrounding the audience with numerous speakers from 
which sound is output uniformly in all directions. This “surround 
sound” technology immerses the listener in sound with speakers 
positioned not only in front of the listener, but also behind and to the 
sides of the listener, making him or her feel as if they are actually in 
the situation.

For precise directional control and quality of sound reproduction, 
sounds must be split into separate audio channels for output to each 
speaker. Surround sound systems for regular home use (7.1-channel 
speaker systems) produce surround sound using seven speakers 
and a subwoofer, as shown below:

As explained above, sounds can be reproduced for a great sense of 
presence by installing multiple speakers. However, this can be 
difficult to do in a living room. This unit utilizes “digital sound 
projector” technology to provide a realistic and engaging surround 
sound experience using only a slim center unit and subwoofer.

A digital sound projector separately controls compact speakers 
installed in orderly rows, so that optimized audio signals are output 
from each speaker and synthesized as highly focused sounds 
(sound beams).

When these focused sounds hit a hard wall, they are reflected off of 
the wall. A digital sound projector outputs sound beams from five 
channels, including front (left/right), center, and surround (left/right) 
channels, by reflecting these beams off of walls so that sounds reach 
the listener from the appropriate direction. It features a technology 
that enables true surround sound without requiring the installation of 
speakers in front of, or behind, the listener.

By combining front and surround channel signals, it can also create 
two new channels, for a total of seven, so that all channels work 
together more closely for a better surround sound experience.

This unit features many more functions based on Yamaha’s superior 
audio technologies.

This technology enhances and extends bass and treble, which tend 
to be weak in digitally compressed formats such as MP3 used with 
portable digital audio players and computers. This makes 
compressed audio sound more musically dynamic.

This technology enables precise digital recreation of actual acoustic 
environments found in well-known concert halls and movie theaters. 
This is achieved using Yamaha’s exclusive sound field programs, 
which are based on data measured in various sound fields, and with 
which the amplitude, depth, and volume of sounds have been 
adjusted.

These headphones are used to virtually reproduce sound fields. They 
provide a more natural and full surround sound experience.

Typical 7.1 channel speaker system

Front speakers

Subwoofer

Surround speakers

Center 
speaker

Surround back speakers

Digital amplifier

Speaker

Sound beams are emitted 
in the target direction

The sound image of the system