Так ли необходим апгрейд колонок до 7.1, имея ресивер 7.1? Сам недавно задавался таким вопросом и нашел такой ответ. Может кому будет интересно.
5.1 vs. 7.1 Audio Q:
I currently have a Blu-ray player and a 5.1 receiver and speaker system. If I upgrade the receiver to a 7.1 receiver capable of playing back Dolby TrueHD and DTS-HD, but don’t add the two more rear speakers, will I still be able to notice a difference in sound quality? Or do I really need to add the two speakers as well before the difference becomes noticeable? A: The most important thing to note here is that you won't lose any parts of a movie's soundtrack by playing a Blu-ray disc with a 7.1 audio track on a 5.1 sound system. If you only have five speakers, you receiver will automatically redirect any sounds designated for the center rear speakers out to the other left and right surround channels instead. Everything will still be there, just spread out to the sides a little more.
The difference between a 5.1 and a 7.1 audio configuration shouldn't have any effect on overall audio fidelity. All you're doing is adding two more speakers that will help to fill in the rear soundstage and give you a couple more discrete points for directional audio cues. This is mostly beneficial in large listening spaces with a significant gap between the left and right surrounds, but is a lot less useful in smaller rooms, where the surround channels are probably already close enough together to create a convincing rear soundfield. Depending on how your room is laid out, you may be just as well off sticking with 5.1 rather than trying to cram in a couple extra speakers that might only serve to muddy the back soundstage.
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