S-Frame subwoofer?

[chris661]

I've had this idea (might even try it), where you (effectively) fold a baffle around a speaker, in the shape of an S

You'd put the woofer in the middle horizontal, and get a dipole output, but the baffle width would seem a lot higher (to the driver) which would result in increased bass output (there would be a lid on this design). I figure that, using an 8" woofer I have knocking around, I could make one that's 6" tall, and 9" square. These could be stackable, for increased bass output.

Someone may have already done this, but I thought it may be worth sharing as the search returned nothing.

Thanks for reading
Chris

[j.michael droke]

Hi There: An enclosure of this type is patetened by Axel Ridthahler and information can be found by Googling: RIPOLE R30. I have constructed a DIY 12-inch single enclosure (operating) and a verticle stacked dual 12-inch DIY version is nearing completion. The single driver version needs a driver with considerable Xmax, so I will be connecting the 2 drivers in the dual version in series. Also you can read-up on ripole, in open back threads and OB theory on Siegfried Linkwitz's site.
... Michael Droke

[chris661]

Ok, thanks for that. Time to do some more reading.

[Dr.EM]

Originally Posted by j.michael droke

...The single driver version needs a driver with considerable Xmax...

Yes, when I was experimenting with OB, I found the dual driver W-baffle/Ripole to have far more output. Worth persuing imo

[chris661]

Thanks for the encouragement. I thought they'd be a good way of getting reasonable bass from a small package - for an 8" woofer, you'd need maybe a 10" square, and 5" deep?

Seems like a good way to reduce size to me...

[j.michael droke]

Originally Posted by chris661

Thanks for the encouragement. I thought they'd be a good way of getting reasonable bass from a small package - for an 8" woofer, you'd need maybe a 10" square, and 5" deep?

Seems like a good way to reduce size to me...

Hi there: My Ripoles use 12-inch driver(s) in 14x14-inch (14x28 for the dual) x 5.375-inch deep enclosures. ...regards, Michael

[tinitus]

Anyone tried a ripole this way ?

[chris661]

Looks similar to a W-frame system, but with a lid, and more edges. If you put the drivers at an angle to each other, you'll see what I mean.

Here's an idea. Make a ripole sub, but then stuff (heavily) one side. Maybe the attenuation would be enough to have significant output at lower frequencies.

[tinitus]

Originally Posted by chris661

Looks similar to a W-frame system

It is
Someone created the "ripole" name fore commercial reasons

I think the original general describtion is "folded dipole"

I presented this, because I havent seen it this way before, with openings facing down and up
Drawing also shows kind of a marriage with H-frame, making the baffle effect more effective
Well, maybe kind of a dipole-omni hybrid

[chris661]

Here's a thought...

Instead of just folding the baffle once (ripole, S-frame, whatever you want to call it), why not fold it lots of times around the driver? You'd get some kind of spiral, not sure what that would do...
I don't know how you'd do it with 2 drivers, but it would be easy enough with one...
Chris