Any advantages to this kind of baffle ?

[Flaxxer]

I see this a lot in DIY, but I assume it is always dipole configuration. But say your mid has a really small sealed back enclosure, and your tweeter was a sealed back AMT, ribbon, or tweeter, as I have shown in red in the two photos below. Are there ANY advantages OR disadvantages to doing this, and keeping the baffle the same width, over a standard cabinet, as on most common speakers?

[/url]Untitledaa (2) by Cullen Graham, on Flickr[/IMG]

[/url]Untitledaa (3) by Cullen Graham, on Flickr[/IMG]

 

[boswald]

well, it only takes two narrow strips of fancy wood to dress it up.

 

[Flaxxer]

Damn. Miss one word in the title ..... 😛😀

Are there any SONIC advantages or disadvantages?

 

[Cal Weldon]

If the lower box is the right size and shape for the woofer and you want to raise the mid/high to ear level, then it makes a lot of sense. Other than that...

 

[ScottG]

Time to play with the Edge to see:

Tolvan Data

(..Basta is also available for more complete modeling and has the Edge "in" it.)

 

[AllenB]

For frequencies that are not too large, the edges will be more significant, as should be the energy given to diffraction. This should be manageable.

 

[Juhazi]

I folllow AllenB, but this is just a guess. I haven't made any comparative measurements of this kind of baffle and monopole radiators.
The visual appearance is much lighter yes!

 

[scottjoplin]

It gives you a handy hidden shelf 😉

 

[globalplayer]

Needs less wood.

 

[Flaxxer]

Damn ... you guys thought of everything, but mounting a small bar sink on the back of one of the bass bins! LOL

I just know that sound radiates out to the edges of a baffle, then around it to the back edges of a speaker, in normal box speakers. So I was just wondering what happens, sound wise, when it rolls around the baffle and there is not a side of a cabinet for it to continue on? Pros and Cons, if any.

I ask, because my particular speakers I'm building will allow this to be done. I fully understand it will save materials cost and weight. But are there ANY sonic drawbacks? Thanks

 

[ScottG]

-diffraction is lower in freq. than more narrow or "non" baffle.

-baffle bounding "support" is lower in freq. than a more narrow or "non" baffle, easily seen in the Edge.

A sharp edge like that though generates MORE diffraction than a nice "cylinder-like" profile.



Basically a larger flat-baffle like that allows a bit lower freq. support for the drivers while having worse diffraction slightly lower in freq. than a well "rounded" baffle.

Higher amounts of diffraction compete with direct sound and usually ends-up making "images" less easily located (..mostly laterally) and is usually less "pin-point" in character.

 

[AllenB]

Scott, it sounds as if you compared to a box with a different sized front?

 

[ScottG]

-different sized front: yes. but not a box. Just a flat plank for the baffle OR a baffle surface that's more like a cylinder in shape (..basically a "post" for the drivers without any volume other than housing the drivers).

I'm assuming both drivers have rear enclosed chambers - effectivly their own "boxes".

 

[Flaxxer]

Okay ... so let's say the edges of the flat baffle, are 2" round overs, like in this terrible drawing ?
There is also a top view of the baffle, looking down.

[/url]20180304_160921 by Cullen Graham, on Flickr[/IMG]

 

[ScottG]

http://www.the-ear.net/sites/defaul.../public/hardware/main-grimm.jpg?itok=H_VnGDmw


-it would be better though if the top edge was rounded over some as well.


or something more complex:

http://www.reno4x4.com/attachment.php?attachmentid=55825&d=1445906391

 

[Flaxxer]

Thanks for the above, Scott. The first photo you linked did it for me. That seems like the ultimate side diffraction treatment to my eyes, and hopefully my ears, LOL.

I have only seen, built traditional shaped enclosures for standard monopole setups. I haven't really noticed the thinner style baffle used in the way I propose, and was just wondering of there were any real drawbacks to dynamics or strange diffraction issues. Since no-one objected .... the top portion of your top linked photo is what I will incorporate on to my bass bin.

Getting close to start making some sawdust !

 

[Juhazi]

Measurements of Grimm LS-1 look good. This is the speaker that ScottG linked first.
Grimm Audio LS1 im Test - connect

 

[Flaxxer]

Thanks, Juha! If I ask enough questions, I eventually seem to get somewhere positive.
They are using 6" pipe for half rounds. Guess I will too. That will really begin to look "the business" ... whatever that actually means, LOL. 😀

 

[Juhazi]

Examples and measurements of diffrent baffle shapes and edge treatment - aber nur auf Deutsch...
Uber Schallwandgestaltung, Kantendiffraktion, Sekundarschallquellen, … – Heissmann Acoustics