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Old 4th November 2010, 03:59 AM   #4931
CLS is offline CLS  Taiwan
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The paths we call "the first reflections" (no matter which) must always be right on axis with listening position, no?
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Old 4th November 2010, 05:15 AM   #4932
AllenB is offline AllenB  Australia
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Quote:
Originally Posted by panomaniac View Post
Can you give us a little diagram to illustrate this?
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Old 4th November 2010, 05:29 AM   #4933
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Ah! Very good, now I understand. Thanks!
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Old 4th November 2010, 05:39 AM   #4934
mige0 is offline mige0  Austria
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Quote:
Originally Posted by panomaniac View Post
Can you give us a little diagram to illustrate this?
Click the image to open in full size.
Click the image to open in full size.


Michael

edit
uups - too late...
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Old 4th November 2010, 06:43 AM   #4935
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Am I the only one that doesn't have a listening chair? I'm all over the place. Anyway, we should probably take this room discussion elsewhere.

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Old 4th November 2010, 07:01 AM   #4936
AllenB is offline AllenB  Australia
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Originally Posted by dantheman View Post
Anyway, we should probably take this room discussion elsewhere.
Aren't we discussing speaker directivity and the response of waveguides at various axes?
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Old 4th November 2010, 09:35 AM   #4937
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Zilch and Dr. Geddes seem to be.

None the less, the picture is worth a thousand words. I'd say pull you speaker out from the wall and if you have a narrow directivity WG, that reflection shouldn't be too much of a problem in the range of the WG. That said, I'd say get absorption up along that front wall and beside the speaker like a short "U".

FWIW, I'd love to discuss room issues elsewhere.

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Old 4th November 2010, 10:05 AM   #4938
AllenB is offline AllenB  Australia
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dan, I disagree with you, but if you name the thread, I'll come for a look.
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Old 4th November 2010, 11:34 AM   #4939
soongsc is offline soongsc  Taiwan
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Originally Posted by AllenB View Post
Aren't we discussing speaker directivity and the response of waveguides at various axes?
I think your graph shows and interesting issue to consider. Within the directivity path with it's first reflection off the opposit wall, the strength of the reflection might not be less than that caused by out-of-beam first reflections.

So now, the reall complication would be profile of beam and roll-off and it's suitability for different listening arrangements.
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Old 4th November 2010, 07:32 PM   #4940
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Soongsc, I think you are on to something there. Look at these blind subjective ratings of various speakers in 2 positions:
Audio Musings by Sean Olive: The Dishonesty of Sighted Listening Tests

I'd love to know more of the specifics about that test.

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