Baffle Construction Techniques

coolkhoa · 7th March 2004, 06:07 PM

To start off, what is the advantage of a shallow recess (horn?) such as that used on Meadowlark speakers? Directivity control?

sreten · 7th March 2004, 06:32 PM

The cynical would say it looks like it is doing something
but isn't, and the acousticians would agree with them.

The practical would say its to prevent the drivers from
being damaged if a flat plane is placed against the baffle.

the marketeers woud say ? your guess is as good as mine,
but it seems to look "organic" and allow the sound to "flow".

sreten.

coolkhoa · 7th March 2004, 06:45 PM

Quote:

Originally posted by sreten
The practical would say its to prevent the drivers from
being damaged if a flat plane is placed against the baffle.

sreten.

Interesting, sreten. I have never thought of that.

But the recess wouldn't hurt, I suppose? So is there any reason why we shouldn't do the same (or any reason we should)?

Vikash · 7th March 2004, 07:05 PM

I wanna say a champfer will have an affect on diffraction...

It looks pretty - don't count that out.

coolkhoa · 7th March 2004, 07:13 PM

Quote:

Originally posted by Vikash
I wanna say a champfer will have an affect on diffraction...

Are you implying this is a good effect?

Vikash · 7th March 2004, 07:21 PM

It can be a good thing under certain circumstances. I remebered it from this thread.

sreten · 7th March 2004, 07:35 PM

If I wasn't clear before I will be now, the chamfering has no effect.
(as shown in the original post)

There is no reason to use it (other than damage prevention)
and no particular reason not to use it either, to the degree
shown in the original post.

The speakers shown in the original post appear to have
no provision for protective grilles and I'd suggest QED.

Though I'm sure the marketing department would disagree.

sreten.

russbryant · 9th March 2004, 01:09 AM

Quote:

Originally posted by sreten
If I wasn't clear before I will be now, the chamfering has no effect.

What are you basing this statement on? I would maintain that it at least has a measurable effect, if not an audible one as well.

Russ

LineSource · 9th March 2004, 02:29 AM

The acoustics of waveguide might be the best mathematics to design and analyze these shallow horns. Waveguides are more common on high efficiency speakers used for large audiences to optimize directionality.

A horn is generally used to increase the acoustic output of a transducer by providing improved loading as compared to directly coupling the transducer to the open environment. Quoting Harry Olsen, "The principal virtue of a horn resides in the possibility of presenting practically any value of acoustical impedance to the sound generator." As a side benefit, it provided some directivity control to the dispersion of acoustical energy. Designers like Bruce Edgar have put greater emphasis on control to the dispersion for home audio horns.

In audio, waveguides are horns with the directional characteristics being the prime design criteria over optimum driver loading.

Acoustic waveguides are sometimes also used to improve dispersion, edge diffraction, and directivity of a transducer like a ribbon that is in a deep rectangular cavity of magnets.

sreten · 9th March 2004, 08:45 AM

Quote:

Originally posted by russbryant

What are you basing this statement on? I would maintain that it at least has a measurable effect, if not an audible one as well.

Russ

IMO the champhering in the original post will be barely
measurable and next to inaudible compared to flush
mounting the drivers and keeping the formed edges.

(Though the bass unit unit champering may cause wiggles
that could be measured, tonally the speaker won't change)

Its an educated supposition.

sreten.

7th March 2004, 07:05 PM	#4
Vikash diyAudio Moderator Emeritus Join Date: May 2003 Location: UK	I wanna say a champfer will have an affect on diffraction... It looks pretty - don't count that out. __________________ "The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)

7th March 2004, 07:21 PM	#6
Vikash diyAudio Moderator Emeritus Join Date: May 2003 Location: UK	It can be a good thing under certain circumstances. I remebered it from this thread. __________________ "The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)

9th March 2004, 02:29 AM	#9
LineSource diyAudio Member Join Date: Sep 2003 Location: SiliconValley	WAVEGUIDE The acoustics of waveguide might be the best mathematics to design and analyze these shallow horns. Waveguides are more common on high efficiency speakers used for large audiences to optimize directionality. A horn is generally used to increase the acoustic output of a transducer by providing improved loading as compared to directly coupling the transducer to the open environment. Quoting Harry Olsen, "The principal virtue of a horn resides in the possibility of presenting practically any value of acoustical impedance to the sound generator." As a side benefit, it provided some directivity control to the dispersion of acoustical energy. Designers like Bruce Edgar have put greater emphasis on control to the dispersion for home audio horns. In audio, waveguides are horns with the directional characteristics being the prime design criteria over optimum driver loading. Acoustic waveguides are sometimes also used to improve dispersion, edge diffraction, and directivity of a transducer like a ribbon that is in a deep rectangular cavity of magnets.

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7th March 2004, 06:32 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	The cynical would say it looks like it is doing something but isn't, and the acousticians would agree with them. The practical would say its to prevent the drivers from being damaged if a flat plane is placed against the baffle. the marketeers woud say ? your guess is as good as mine, but it seems to look "organic" and allow the sound to "flow". sreten.

7th March 2004, 07:35 PM	#7
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	If I wasn't clear before I will be now, the chamfering has no effect. (as shown in the original post) There is no reason to use it (other than damage prevention) and no particular reason not to use it either, to the degree shown in the original post. The speakers shown in the original post appear to have no provision for protective grilles and I'd suggest QED. Though I'm sure the marketing department would disagree. sreten.

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