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Rear surround effect missing with Pro Logic II

by jmcollishaw / April 26, 2006 7:07 PM PDT

I have an Onkyo TX-SR302 receiver connected to a Pioneer 5.1 speaker system.
When I'm listening to stereo sources such as television or FM radio, there is no sound output from the two rear surround speakers. I get output only from the center channel speaker, two front side speakers and subwoofer. The output mode is Prologic II Music.
When I listen to digital sources such as DVDs (in Dolby Digital mode), then I get good effects from the rear surround speakers as well, but while listening to analog sources there is no sound at all from the rear surround speakers.

Is that normal? Any idea why is there no output from the rear surround speakers? Is there anything I can do to improve the situation?

Thanks!

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Normal, yep. . .
by Coryphaeus / April 26, 2006 9:26 PM PDT

You have to understand the signal input. If the source is 5.1 (as in from a DVD or TV Hi-def) then you'll get the full effect. The logic circuits in the receiver can tell what the input is, and if it's 5.1 it'll send to the surround speakers. If the input is standard 2 channel stereo (as in regular TV or FM) the receiver outputs to the front only, with bass. You named it in your comment:

"When I listen to digital sources such as DVDs (in Dolby Digital mode), then I get good effects from the rear surround speakers as well, but while listening to analog sources there is no sound at all from the rear surround speakers."


The receiver is working perfectly.

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But then...
by jmcollishaw / April 26, 2006 9:32 PM PDT
In reply to: Normal, yep. . .

Dolby Pro Logic II is supposed to be capable of decoding full 5 channels from the stereo input signal. At least that is what the Dolby website claims. If that is true, then why is that it is not able to decode any information pertaining to the rear surround speakers?

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Because. . .
by Coryphaeus / April 26, 2006 9:36 PM PDT
In reply to: But then...

"Analog" sources (FM radio and standard TV) are not 5.1. There are no discrete 5 channels in this signal.

Some receivers like my RCA Pro have a setting for "Simulated Surround" from an analog source. It will send a lower level to the rear speakers. Your receiver may have this also.

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Not so true...
by wwywong / September 15, 2006 7:58 AM PDT
In reply to: Because. . .

I have a entry level Sony receiver that does pro logic II, when it is in pro logic II music mode, it DOES have sound coming out from the rear speakers. Now I didn't do deep research to test it so to figure out whether the sound from the rear are really distinct (Rear L and Rear R), but i can confirm you that sound does come out from the rear when you are in pro logic II music mode. Of cuz, the sound is not as great as real dolby digital or DTS, since those are real 5.1. Pro logic II simply decode the stereo and ''interpret'' the signal into 5 seperate channels...

So if your rear spkr really doesn't even have tiny sound coming out in pro logic II music mode, then you might need to check with diff music. (some music have more distinct sound in the rear, while some might be relatively quiet.)

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