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In Reply to: RE: 6.1 or 7.1, is it worth doing more than 5.1? posted by kvk on December 12, 2007 at 08:43:51
You know that the human brain can only sort out sound from three directions at the same time? But since 2 more speakers mean 6 more db, 7 speakers must be awsome.
Follow Ups:
Doubling the number of speakers adds 3 dB.
2 speakers adds 3 dB to 1 speaker.
4 speakers adds 3 dB to 2 speakers.
8 speakers adds 3 dB to 4 speakers.
That assumes, of course, that there's an identical signal at identical levels going to each speaker.
With surround sound soundtracks, the dominant signal is usually the centre channel followed by the front L & R channels with the side surrounds and rear surrounds (if you have them) normally receiving a weaker signal. Adding 2 channels to an existing 5.1 system doesn't add much to the overall level, if it adds anything at all. For discs with a 6.1/7/1 channel soundtrack it probably won't add anything because the signal for the rear channels will be folded into the signal for the side surrounds if you only have a 5.1 setup. Sending it to separate rear surrounds instead of adding it to the side surrounds is not going to make a significant difference to the volume levels. If you want a significant increase in volume, you'll have to play with the volume knob.
David Aiken
My bad. (I do know 3db is a doubling of the sound level. Just wasn't thinking.)
To me that means there's one less reason to go 5+1+1.1.
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