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Old 2nd January 2013, 06:14 PM   #91
dewardh is offline dewardh  United States
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Originally Posted by Elias View Post
See posts #59 and #60 for a simple how-to.
OK, here's from #59

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Originally Posted by Elias View Post
You can wire three speakers Trinaurally in a very simple way to form a matrix (abandon the input resistors in this case)

Ls = L - 0.5*R
Rs = R - 0.5*L
Cs = 0.5*L + 0.5*R
Why would I want to put .5R in the left channel? How is that going to help anything?
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Old 2nd January 2013, 07:24 PM   #92
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@marcus

Are those FRS8s in the cardboard at the wall? Where is the nearfield bass crossed in?

I have also wanted to try 3"s in 45cm x 45cm carpet squares that I have lying around, and curve the square a little to terminate well in the corners, but I'm very pressed for time at the moment.
Yes, those are FRS8's but I got it to "work" with Behringer P2031A's and B200's too. Very different speaker concepts. They simply differed in tonality but not in spatial properties. The important part is level, timing and spectrum of the reflections.

The near field subs are crossed in at 150Hz for the FRS8's.
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Old 2nd January 2013, 07:32 PM   #93
Pano is offline Pano  United States
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I think it is an additional advantage to cross feed negative signals to opposite side channels, too.
I agree, but then it's no longer simple, easy to set up, and works well for everything.
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Old 2nd January 2013, 07:48 PM   #94
Elias is offline Elias  Finland
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Originally Posted by dewardh View Post
OK, here's from #59

Why would I want to put .5R in the left channel? How is that going to help anything?
There are two important benefits in doing so. First it maximises the signal separation between speaker feeds. Secondly it adds MS stereo side signal to side speakers.

It may help if you rewrite the speaker signals with help of MS stereo notations.


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Old 2nd January 2013, 07:51 PM   #95
Elias is offline Elias  Finland
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I agree, but then it's no longer simple, easy to set up, and works well for everything.
Well, but have you forget your own post #60 ? What can be simpler ?

It is simpler to wire the matrix of 0.5 than get summed center only


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Old 2nd January 2013, 07:52 PM   #96
dewardh is offline dewardh  United States
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but then it's no longer simple, easy to set up, and works well for everything.
Bingoit
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Old 2nd January 2013, 08:12 PM   #97
dewardh is offline dewardh  United States
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It may help if you rewrite the speaker signals with help of MS stereo notations.
As it happens I actually own a Fostex M20RP MS stereo microphone . . . and even for recordings made with it things just. don't. work. that. way. Matrixing that works at the coincident microphone doesn't work with speakers 2 Meters apart. You really need to get past the simplistic "notations" and think about what really happens. If you can figure out how to make a "one speaker stereo" with driver spacing no greater than the microphone capsule spacing you might have something . . .

With more typical microphones and mixing it only gets worse . . .
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Old 2nd January 2013, 08:20 PM   #98
Pano is offline Pano  United States
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Well, but have you forget your own post #60 ?
Yes. I blame it on old age.
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Old 2nd January 2013, 08:34 PM   #99
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If you can figure out how to make a "one speaker stereo" with driver spacing no greater than the microphone capsule spacing you might have something . . .
I don't think so. Care to elaborate?
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Old 2nd January 2013, 10:17 PM   #100
dewardh is offline dewardh  United States
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I don't think so. Care to elaborate?
No . . . the comment was more sarcastic than serious. MS matrixing only works when capsule/"driver" spacing is a fraction of a wavelength.
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