Stereo Sound
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Joined: Sep 2003
Posts: 42
buff
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OP
buff
Joined: Sep 2003
Posts: 42 |
I need to understand stereo sound. So far I understand that stereo sound is availabe to a pair of speakers driven by a stereo amplifier.
So does this mean that stereo sound will only be available to the two main speakers of lets say a 5.1 system and the other speakers aren't utilised. Will it be the same for other stereo input sources like fm tuners, cassete decks, vcrs... etc.
Clovis de Cruz
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Re: Stereo Sound
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Joined: May 2002
Posts: 10,654
shareholder in the making
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shareholder in the making
Joined: May 2002
Posts: 10,654 |
Not necessarily, clovis. All receivers doing 5.1 or more have one or more processing abilities to take stereo material(all those you mentioned) and extract some information which is then sent to center and surround speakers. Examples are Dolby Pro Logic II(new DPLIIx just out)and Logic7. The result isn't fully equal to 5 or 6 channel recordings, but it's pleasant in many cases. Some prefer not to use it and listen to stereo material only through the 2 main speakers; it's a matter of choice.
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Enjoy the music, not the equipment.
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Re: Stereo Sound
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Joined: May 2002
Posts: 61
old hand
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old hand
Joined: May 2002
Posts: 61 |
Depending on your amp and settings, a 2-channel source played on a 5.1 channel system may "bleed" into the other speakers even if you are not using a 5CH stereo matrix. I have a Denon AVR-1802 and I have observed a small amount of bleeding into the surrounds with stereo sources and Dolby decoding. Switching the input mode to "stereo" stops the bleeding. Quite honestly, the bleeding is so faint that I rarely bother to make the change. Still, forewarned is forearmed!
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Re: Stereo Sound
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Joined: May 2003
Posts: 1,501
connoisseur
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connoisseur
Joined: May 2003
Posts: 1,501 |
robdarst,
What mode is your receiver in when you hear this "bleeding"?
-curtis
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Re: Stereo Sound
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Joined: May 2002
Posts: 61
old hand
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old hand
Joined: May 2002
Posts: 61 |
Hi Curtis,
I have a Denon AVR-1802 and a Pioneer DV-563A as sole transport. Bleeding from a 2-channel source (e.g., CD) into the center and surrounds occurs when the receiver is in "Dolby PLII C" mode, which is the mode the receiver automatically goes to when it detects a digital CD signal. I can stop the bleeding by selecting either "PCM" as the "input mode" or "stereo" as the surround mode.
Up until now, I had assumed this was "normal" (though undesirable) receiver behavior. Has anyone else experienced this phenomenon, or do I have a buggy receiver?
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Re: Stereo Sound
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Joined: Apr 2003
Posts: 608
aficionado
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aficionado
Joined: Apr 2003
Posts: 608 |
does your receiver have a auto format button or setting that can determine weather its a 2 channel or other recording? or a setting to assign to a pcm mode when it detects a stereo signal without having to switch it manualy?..ron
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Re: Stereo Sound
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Joined: Feb 2003
Posts: 1,490
connoisseur
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connoisseur
Joined: Feb 2003
Posts: 1,490 |
Rob,
Um? Isn't the "Dolby PLII C" mode that you described, essentially the Dolby ProLogic II? If so, what you've heard from the center and surround channels is not a bleeding, but legitimately matrix-synthesized center and surround sounds.
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Re: Stereo Sound
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Joined: May 2002
Posts: 10,654
shareholder in the making
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shareholder in the making
Joined: May 2002
Posts: 10,654 |
Rob, as sushi points out, the "bleeding" you describe would appear to be the usual DPLII Cinema processing. The DPLII Music mode is generally suggested for listening to music and you should try it if you haven't already done so to see if you get a more favorable impression of DPLII. If not, then you may simply be one of those who don't care for it and should use the stereo mode.
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Enjoy the music, not the equipment.
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Re: Stereo Sound
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Joined: Feb 2003
Posts: 1,490
connoisseur
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connoisseur
Joined: Feb 2003
Posts: 1,490 |
Also, depending on receivers, the Dolby ProLogic II Music mode allows you to adjust several matrix-decoding parameters, such as the center width (essentially center-channel level) and soundstage depth.
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Re: Stereo Sound
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Joined: Jan 2002
Posts: 3,270
connoisseur
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connoisseur
Joined: Jan 2002
Posts: 3,270 |
Hi all,
That bleeding is correctly termed "crosstalk." Old-fashioned analog Dolby Pro Logic's separation figures weren't so great--a maximum of about 30 dB of separation between channels--but still a huge improvement over the Dolby Surround matrix, which yielded a maximum of 3 to 6 dB if memory serves.
The separation figures for DPLII are much improved but without consulting my contact at Dolby Labs I'm not sure by how much.
Regards,
Alan Lofft, Axiom Resident Expert (Retired)
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