What is your preferred option for converting 5.1 to 7.1 with Surround Back? - AVS Forum
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post #1 of 8 Old 12-04-2012, 02:28 PM - Thread Starter
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I recently bought an Onkyo TX-NR818 and wonder what the preferred option for converting 5.1 to 7.1 with Surround Back is. My receiver does Dolby Pro Logic IIx, DTS Neo:X, THX Select2 Cinema, and THX Surround EX for accomplishing this. It may have other modes that I have not found. My receiver also does Audyssey DSX, but I think that only adds Front Wide and Front Height speakers, and not Surround Back speakers.

Btw, I would like the settings for watching movies.

Thanks a lot for any help.

HD-A1 + XBOX Add-On + PS3 = Format Neutral
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post #2 of 8 Old 12-04-2012, 04:06 PM
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Those two THX modes extract a mono surround-back channel from the surround channels, sending the same content to both rear speakers. By comparison, PLIIx and Neo:X extract stereo surround-back channels, so the rear speakers contain independent info rather than being run in dual-mono.

With that in mind, my preferred option is for PLIIx and Neo:X instead of the THX modes. Of the two preferred options, I don't find much difference when using them to scale 5.1 channels to 7.1 speakers. I would lean towards PLIIx because the stereo separation in the rear speakers is a little more distinct.

Sanjay
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post #3 of 8 Old 12-04-2012, 05:19 PM
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I use PLIIX for the reasons stated above.
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post #4 of 8 Old 12-05-2012, 11:02 AM - Thread Starter
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Will PLIIx or Neo:X degrade lossless TrueHD, DTS HD MA, or PCM tracks, or will they simply steer the lossless audio to the Surround Back speakers?

HD-A1 + XBOX Add-On + PS3 = Format Neutral
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post #5 of 8 Old 12-05-2012, 12:04 PM
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I've set PL Iix 2 years ago and it truly enhances the 5.1 into 7.1 quite well.


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post #6 of 8 Old 12-05-2012, 06:05 PM
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Another vote for PLIIx.

Cheers,

Peter M


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post #7 of 8 Old 12-16-2012, 11:56 AM
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Hi, I have the same AVR running 9.2 with rears and heights and I finally settled on NEO X:)
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post #8 of 8 Old 12-16-2012, 12:48 PM
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Quote:
Originally Posted by TazExprez View Post

Will PLIIx or Neo:X degrade lossless TrueHD, DTS HD MA, or PCM tracks, or will they simply steer the lossless audio to the Surround Back speakers?
The latter. Lossless audio doesn't stop being lossless when you apply bass management, time alignment, surround processing, room correction, etc.

Sanjay
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