What Actually Happens When 5.1 Is Played On A 7.1 System? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 3 Old 06-12-2017, 06:30 PM - Thread Starter
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What Actually Happens When 5.1 Is Played On A 7.1 System?

Just added a couple more speakers to my 2009 Sony STR-DA5400ES amp that was limited to 5.1 for many years, so that now I've got a true 7.1 system.

I have to say 7.1 Blu-rays are very much better than the same Blu-rays playing back as 5.1.

Question for geeks: what officially happens when I go the other way?

What happens when I play a 5.1 Blu-ray back on my 7.1 system? Does the amp simply duplicate the 5.1 surrounds into the 7.1's rear surrounds? Synthesize something else? Ignore the rear surrounds?

Thanks.
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post #2 of 3 Old 06-12-2017, 07:01 PM
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It depends on what surround processing you choose to use. I used PLIIx which extrapolates sounds that it believe would come from rear speakers based on algorithms created by dolby labs. Read your manual and it will tell you what surround choices you have and then you can google them.
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post #3 of 3 Old 06-12-2017, 10:18 PM
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The 5400 has multiple options..
1. If the DVD or Blu Ray is 7.1, the 5400 can process 7.1 DTS Master audio, Dolby Digital or Dolby Tru Audio depending upon whats avaialble on the media
2. If the DVD or Blu Ray is 5.1, the 5400 will create back L/R surrounds using Dolby Pro Logic IIx

To better understand the options, read carefully the operation manuals for the 5400 and media player for the proper settings.

Just my $0.02...
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5.1 , 7.1 , blu-ray 5.1 , blu-ray 7.1 , sony str-da5400es

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