Widget dipole

[bzfcocon]

Hi folks,

What would be the radiation pattern of a "widget dipole" as depicted in my sketch and which woulld be it's axis of symmetry?

What I need: I have an existing "Y" or "A" frame with a woofer. I want to augment it with a second woofe on one of the wings for 2 reasons:
- get more bass (admittedly, probably it will not double because of how the outputs of the 2 woofers in the frame would combine)
- get an additional bass source whose direction of radiation is different than the first, to make the response more uniform in my current room.

I expect a sort of cardioid. Perhaps having the 2 woofers at 90 degrees rather than >90 degrees would be better?

What do you think ?

[bzfcocon]

Nobody tried a folded baffle like this ?

I know of the RAAL Eternitý, which uses woofers on 5 sides of a cube, the 6th being open - but that's a symmetrical arrangement and should give you a sort of dipole radiation that is horrizontally symmetrical (but the front lobe should wider)

Any software you know that can simulate this ?

[LineArray]

Hello,

i expect the radiation axis to be oriented diagonally
from upper left to lower right in the picture.

It will be a cardioid. Cardioid shape will probably
be more pronounced towards upper bass.

Concerning "uniformity" in the room, please
note that typically below 200Hz in most
rooms sound pressure at a certain listening
position depends on excitation of room
modes.

To get higher efficiency a larger dipole path length
would be the way to go ...


Kind Regards

[bzfcocon]

Thanks LineArray!

Originally Posted by LineArray

Concerning "uniformity" in the room, please
note that typically below 200Hz in most
rooms sound pressure at a certain listening
position depends on excitation of room
modes.

It is precisely because the current 1-woofer dipole causes a deep suckout on a mode around 70 Hz that I wanted to "fill in" - kind of the Geddes multiple subs approach, but with dipoles.

But I realize that I need separate dipoles for that:it was a bit naive to consider the 2 woofers in a folded baffle as independent dipoles. The widget configuration might or might not be better, depending on how it fits the modes.

[john k...]

Originally Posted by LineArray

Hello,


It will be a cardioid. Cardioid shape will probably
be more pronounced towards upper bass.



Kind Regards

You are guessing.

More likely [no, for sure] it will be dipole at low frequency and who knows what it would morph into as the frequency rises.