Raal inspired bass dipole - diyAudio
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Old 23rd June 2009, 10:54 AM   #1
el`Ol is offline el`Ol  Germany
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Default Raal inspired bass dipole

Hello all!

"Alex of Raal" built a speaker some time ago (I donīt know whether it is regularly sold now) with an innovative bass section that featured a cube standing on a corner with drivers on five sides.
http://www.6moons.com/industryfeatur...rbia/raal.html
I am considering a cube standing on an edge with four drivers.

Has anyone here veryfied this concept?
My goal is less boosting than in a flat baffle and no need for a notch like in a ripole.
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Old 23rd June 2009, 12:13 PM   #2
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That's an omni not a dipole.

It should sound a lot like your room, the opposite of a dipole.
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Old 23rd June 2009, 02:00 PM   #3
el`Ol is offline el`Ol  Germany
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Sorry, I forgot to mention that one side of the Raal bass is open. So is the rear of my concept.
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Old 24th June 2009, 03:40 AM   #4
CLS is offline CLS  Taiwan
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If you mean a 5-sided box then it'll surely work, under a certain frequency of course. And it looks great

I've once built an open back 5-sided box in an ordinary rectangular shape which has 2 pairs of parallel walls. There're some nasty resonance peaks somewhere in mid to midbass which could not be damped effectly by stuffings. Of course the damping materials work to some extent but the annoying "box sound" can not be completely suppressed. So I'd avoid such construction in or near the midrange.

And what about the front surface of the box? Just a plain board? Or put on another driver? Ah! that will break the perfect force-cancellation.

Playing with some stuffing tricks, maybe you'll get a cardioid response.

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Old 24th June 2009, 03:57 AM   #5
CLS is offline CLS  Taiwan
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How about this, 3-sided and standing on one of the tips:

Click the image to open in full size.

3* 8-Ohm woofers connected in parallel yields a 2.67 Ohm load. In narrow band application (subwoofer) it should be fine.

And you'll need some frameworks on the rear side for overall rigidness. Or just see it as a framed cube without 3 of the surfaces.

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