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Old 13th December 2012, 08:26 PM   #101
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Originally Posted by norman bates View Post
you can always try the left speaker, summed left + right speaker, and right speaker.

Just use 3 drivers and play with levels, play with a squeek of delay.

Yes race won't be there, but it gives a solid center and a panned left/right, versus a diffuse center.

Norman
This is what I meant, but instead I said L-C-R... Although that could work for a soundbar type thing. I like this idea, just for the simplicity. Elias' your methods seem good, up to the point where my understanding of the subject falls short. I guess id just like a simple passive system.
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Old 13th December 2012, 08:36 PM   #102
Elias is offline Elias  Finland
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I guess id just like a simple passive system.
Really ? Then you should try this
Elias Pekonen Home Page - Stereophonic Sound from a Single Speaker


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Old 13th December 2012, 08:38 PM   #103
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Yes exactly there is no way to steer the midrange freqs by only using 2 drivers. You'll need 3 drivers and the matrix. Then only a vector is formulated which can be steered by the stereo panning.


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Ok, do I delay the summed center to achieve time coherence with the L+R?
And will this configuration solve the way to diffused soundfield?
I would hate to invest in 25 more drivers and be disappointed.
Of course if I delay center than it would only be in phase with the reflected HF.
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Old 13th December 2012, 09:14 PM   #104
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uhhhhh.

Try it with something else instead of buying more drivers.

Maybe 3 cheapie but exactly the same speaker (2-way, whatever).

And yes, the center speaker may be moved back.

Norman
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Old 13th December 2012, 09:21 PM   #105
Elias is offline Elias  Finland
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Ok, do I delay the summed center to achieve time coherence with the L+R?
Time to ask yourself a question: Why a side image would need to be in time coherence with a center image ?

In the original sound event they are not in time coherence, unless all the performers are located in a circular arch surrounding you which is highly unlikely.
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Old 13th December 2012, 09:28 PM   #106
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I'm not sure about this one Elias.
If it's a live recording and there are spot mic's across the stage then I see your point.
If it's a 2 mic recording or M/S of a live event then that time difference is already accounted for.
Studio recordings, well. They are usually close mic'd. So, the drums are always across the whole stage as well as piano. I guess any large instrument takes up the whole stage if close mic'd.

Also with matrix aren't center sounds coming through R+L also?
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Old 13th December 2012, 09:47 PM   #107
Elias is offline Elias  Finland
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Also with matrix aren't center sounds coming through R+L also?
R+L is the center signal in a linear matrix.
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Old 13th December 2012, 11:09 PM   #108
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I know, I meant what is mixed to center.
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Old 13th December 2012, 11:12 PM   #109
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Alright, tall ya what.....
I will build a prototype out of single drivers before I invest in a line.
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Old 14th December 2012, 12:10 AM   #110
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sure, but...........

3 x 3.5" may not cut it.

Maybe 4 x 3" per line (left, center, right), that be what, Sd = 6.5" ?

That way you don't have to buy any more drivers

I'm not really sure.
I see that a delay may be fine for the sides (maybe 3-4mS) versus the straight direct center sound.
But you are right, it should already be mixed in.

Didn't Ralph from ambiophonics have all sorts of speakers around then you set delays based on what hall you wanted to be in ?

Who knows.

But I do know that 3 loudspeakers across the front with center as L+R, was commented on being able to turn your head a bit to zoom in on different things, like a cocktail party zooming in on different conversations. I have zero experience, but I do trust the ears that said that.

Passive L+R is tricky because of changing impedences.
But as I learned from Home Theater, have the exact same speaker left, center and right, and ideally the rears same as the front if you can swing it.

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