Many AV receivers have room sound processing methods that calculate information to drive additional speakers. The manufacturers want to improve the impression of space. Purists, on the other hand, argue that DSP effects dilute the original recording.
Only for true film fans
The two most popular solutions Pro Logic IIz and Audyssey DSX (Dynamic Surround Expansion) analyze the source material supplied with 5.1 or 7.1 discrete channels to extend the spatiality. To do this, phantom sound sources are extracted and assigned to additional speakers.
Dolby operates on Pro Logic IIz with two front-height channels, which are installed over the main loudspeakers. DSX adds two wide channels to the treble speakers, which fill the gap to the surround channels outside the front boxes. In addition, the signals for the surround and surround back channels also receive real-time post-processing.
Both procedures have to face challenges. Of course, there are soundeffects, in which the Dolby or Audyssey preparation succeeds particularly well. This includes rain or wind noise in films. You feel more pushed into the screen with the extra channels, feel less the individual speaker locations and enjoy a panorama with fewer gaps. The space just appears with DSX.
There are, however, also sound examples, which are all the less convincing, the higher or higher the front speakers and the center, above all music recordings. Here, the stage is increased by the processing, but precision and imaging suffer - for the sole reason that no one would like to hang a B & W Nautilus 801 under the ceiling, but would use inexpensive compact boxes with different sound characteristics for the additionally calculated channels
Thus, the use of Pro Logic IIz or DSX is only recommended to fans who want to help the simple - the best uniform - boxes.
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