Is this a good OB design?

[MartinAndersen]

Hi what the pro and cons for the arrangement of drivers for the speaker below?

I ask because I have the drivers, not the same, but same size and I am split between a wide baffle and a narrow one.

Narrow:

Wide:
http://www.sonusfaber.com/ContentsFiles/SFweb13_0072edit-Modifica.jpg

I am using a active filter so I can boost the midrange if I decide to use a narrow baffle

 

[zmyrna]

I have done OB speakers and found that the baffle rattles too much for my liking.
I will be building a baffleless speaker like this one next time:
Hawthorne Audio • View topic - Augie in baffleless design
I will run the main speaker down to 80hz and add a double 18" ripole sub for the lower octave.

 

[Inductor]

MartinA,
The SonusF has a round front baffle not flat.
Why don't you see by yourself. ()Help/Simulate with the Edge software (by Tolvan Data). Have fun.

 

[thunk303]

The Edge is easy to get clear results about what the effects will be.

I found an offset mid driver on a wide baffle to have a much smoother response in real life that needed little eq.

I always try new OB baffles with cheap ply. It only takes me 30 minutes to cut and route a new one.

Also get or make yourself a good router circle jig. Life saver!

 

[Inductor]

After saying that (haha), more ideas come to my mind. Give a look below and google for more, also in diyAudio.
http://www.diyaudio.com/forums/multi-way/233045-ae-speakers-dipole-15-lo15-need-advice.html

 

[adason]

Inductor, why do you advertise fake interview on youtube?

 

[adason]

MartinAndersen, that open baffle is most likely sounding very good, assuming crossover is well executed. However, they have nothing in common with Sonus Faber.

 

[MartinAndersen]

MartinAndersen, that open baffle is most likely sounding very good, assuming crossover is well executed. However, they have nothing in common with Sonus Faber.

I know that the sonus and ikea has nothing in common. There are just examples of a narrow and wide baffle. The sonus is 65cm wide from top to bottom playing in 2 pi from around 300 hz and up.
The ikea needs baffle step corrections to do the same. Not talking about the woofers the of curse needs some kind of equalization for any kind of OB speaker

 

[MartinAndersen]

The Edge is easy to get clear results about what the effects will be.

I found an offset mid driver on a wide baffle to have a much smoother response in real life that needed little eq.

I always try new OB baffles with cheap ply. It only takes me 30 minutes to cut and route a new one.

Also get or make yourself a good router circle jig. Life saver!

I life in a flat and any kind of wood work is a no go

 

[Juhazi]

That bullet profile is nice. It is good for the midrange to have a narrow baffle, dipole operation goes much higher than typical large square "doorpanels". Also the monopole tweeter benefits from ellipsoid frame, is smooths out (distributes) edge diffractions.

 

[Inductor]

Inductor, why do you advertise fake interview on youtube?

Send PM so we can discuss in private.

 

[MartinAndersen]

I have chosen the bullet form.

My next question, should I use a U frame for the bass section? and how deep?

 

[Juhazi]

Download The Edge (freeware) and see yourself!http://www.tolvan.com/edge/help.htm
U-frame makes the baffle wider, which means more bass (less equalization needed). It also shifts dipole null lower, which migt be a problem considering power response.

Please study this excellent homepage for dipole design By Rudolf Finke
Dipolplus - Alles über offene Schallwände
his white paper in english http://www.dipolplus.de/downloads/Open%20baffle%201.pdf

 

[Pano]

I have done OB speakers and found that the baffle rattles too much for my liking.

That is often a problem, but did you look at the baffle in that photo? Do you think it would rattle?