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Old 18th November 2013, 08:15 PM   #1
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Default baffle slant fact or fiction.

what does slanting the baffle at an angle do? is there any benefit or could it just be to make it look different? Some say its to time align the drivers. fact or fiction?

doesn't it cause the sound to beam upwards rather than straight ahead?
 
Old 18th November 2013, 08:20 PM   #2
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Quote:
Originally Posted by lilun View Post
what does slanting the baffle at an angle do? is there any benefit or could it just be to make it look different? Some say its to time align the drivers. fact or fiction?
That it in a nutshell. It's helping to align the acoustic centers of the drivers. In general the smaller the driver the less far behind the front edge of the frame is the acoustic center. Keep in mind that the crossover networks themselves also create phase shift and delay that are not necessarily complementary at the crossover point, so tilting the baffle is really is of limited use.

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Originally Posted by lilun View Post
doesn't it cause the sound to beam upwards rather than straight ahead?
Only if you tilt the baffle to point at the ceiling...
 
Old 18th November 2013, 08:30 PM   #3
tinitus is offline tinitus  Europe
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it is to avoid a stepped baffle which could have diffraction issues

either is needed to make simple crossovers possible

why would it be fiction
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Old 18th November 2013, 08:39 PM   #4
Bare is offline Bare  Canada
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Dunno.. it was a fair question.. Wayyyy too much in Audioland is based on dubious conjecture and thin proof.
But new and different has always aided sales.
Witness PT Barnum.
 
Old 18th November 2013, 08:55 PM   #5
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Originally Posted by tinitus View Post
it is to avoid a stepped baffle which could have diffraction issues

either is needed to make simple crossovers possible

why would it be fiction
what do you mean by stepped baffle?
 
Old 18th November 2013, 09:14 PM   #6
tinitus is offline tinitus  Europe
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Originally Posted by lilun View Post
what do you mean by stepped baffle?
offsetting drivers
but google explains it much better than me

and found this thread from here Hypothetical Stepped Baffles

and ofcourse Troels have a done a study on this http://www.troelsgravesen.dk/stepped-baffle.htm
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Old 20th November 2013, 12:51 AM   #7
halo71 is offline halo71  United States
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Originally Posted by lilun View Post
what do you mean by stepped baffle?
I just don't get you. You start threads and talk/act like you know so much about designing speakers. And how it's such an easy thing to do. Yet you don't know how to use the search feature or Google what a stepped baffle is?

And you tend to state things as facts without knowing a thing about what you are typing. What gives? Google got you blocked or something?

Last edited by halo71; 20th November 2013 at 12:54 AM.
 
Old 25th November 2013, 01:19 AM   #8
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I don't know about slanted baffle, but one obvious side effect is the fact that at least the front and rear are not parallel, which helps avoid standing waves inside the enclosure. Now at the frequencies we are talking about, this is dubious! I am not to sure if it has any effect on this aspect.
Luc
 
Old 25th November 2013, 02:15 AM   #9
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by lilun View Post
what does slanting the baffle at an angle do? is there any benefit or could it just be to make it look different? Some say its to time align the drivers. fact or fiction?

doesn't it cause the sound to beam upwards rather than straight ahead?
Crossover can make sound coming faster from any of the driver. Slanting basically solve this issue. It assumes the standard height of stand and a standard height of ears/sofa.

But it doesn't help phase issue in crossover. Good speaker doesn't have limited listening position. In other words it must have good dispersion from the start.

But as has been pointed, slanted baffle is not rectangular baffle, so help from the standing wave etc.

But if your drivers are more than 2, may be it is more critical as you cannot just toe in or out the speaker because what you need is a relative position of the drivers to get the desired dispersion (Look at multi-speaker designs such as the Wilson Alexandria).
 
Old 28th November 2013, 08:34 AM   #10
Juhazi is offline Juhazi  Finland
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The concept of a loudspeaker's acoustic center is a little vaque. The physical acoustic center of a transducer with some diameter, at d/2 distance =r) from the surface of the membrane. Well, most membranes are cones, some domes which makes this a littel difficult. AES PNW Meeting Report - The Acoustic Centre

Often it is said that tweeter has it acoustic center behind the membrane. But this is just a rule of thumb with the prejudice that a woofer's center is at it's membrane level.
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