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Old 27th February 2013, 09:38 PM   #1
markusA is offline markusA  Sweden
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Default Stereo with 3 speakers, is there such a thing?

Does it exist or am I just dreaming stuff up?

I'm thinking about some sort of electronic thing/filter/mixer/dsp...
that takes all the information common to both L/R channels and channels it to a center channel and leaving only the distinctly different audio for the L/R speakers.
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Old 27th February 2013, 10:31 PM   #2
DUG is offline DUG  Canada
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"...information common to both L/R channels and channels it to a center channel ..."

This is what they do for the subwoofer signal. (only with a low pass filter)

But if you do that with other frequency bands you are effectively reducing your stereo separation.

Most people don't want that.
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Old 27th February 2013, 10:34 PM   #3
kouiky is offline kouiky  United States
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I had the schematic to build a pseudo center channel processor and I'm sure you can find a few online as they are very useful for wide spread speaker placement in large rooms. Meridian also offered true 3 channel reproduction for the Trifield format that sadly never gained ground.

Last edited by kouiky; 27th February 2013 at 10:37 PM.
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Old 27th February 2013, 10:40 PM   #4
markusA is offline markusA  Sweden
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I just thought it would be an interesting experiment. Lol
Removing shared music information would put less demand on the L/R speakers possibly allowing for smaller units and such.
Just toying with the idea.
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Old 27th February 2013, 10:50 PM   #5
JMFahey is offline JMFahey  Argentina
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Something roughly similar is made to transmit a "Stereo but mono compatible" FM signal.
The main signal has L+R info, and an auxiliary subcarrier has the *L/R difference* signal.
So a simple receiver listens to it as "Mono" and a more complex stereo receiver can decode the stereo one, both from the same FM channel .
Otherwise you would need 2 channels which is expensive and inefficient.
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Old 28th February 2013, 11:20 PM   #6
wwenze is offline wwenze  Singapore
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Actually you know what, come to think of it stereo expanders already exist.

Last edited by wwenze; 28th February 2013 at 11:33 PM.
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Old 28th February 2013, 11:34 PM   #7
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Vintage amps often had instructions on how to wire in a center channel speaker. Below is an example. But you should know if there is a hole in the center of your STEREO image there is something else wrong.
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File Type: jpg Audio system with center speaker.JPG (20.4 KB, 33 views)
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Old 28th February 2013, 11:58 PM   #8
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When Paul Klipsch developed his Klipschorn he also developed a special "matching" center channel loudspeaker, the Belle...if I'm not mistaken. I do not know why but my theory is....since the Klipschorn only functions in a corner....more than likely the horns were put on the long side of rectangular rooms, leaving a "hole" in the center(Too wide a placement) So he built the Belle for the center.

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