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Old 16th August 2006, 03:09 AM   #1
Ang is offline Ang  United States
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Default omnidirectional test (Duevel on the cheap)

I've always wanted to hear some of Duevel's speakers - check out their omnidirectional designs... which have also won a lot of praise.

Their cheapest model The Planets got me wondering.

How hard would it be to flip over a speaker and hang a crystal ball over it? More to the point, how good/bad would it sound? I've only got open baffles here, but if someone wants to give this a shot or there's more info on it, I'd be interested.
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Old 16th August 2006, 07:58 AM   #2
Pano is offline Pano  United States
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Those things are cool! Thanks for the link. Should sound pretty wild. Might be fun to try.
I like the top horn on the bigger models.

I've got pair of 2 ways gathering dust. If only I could find some metal orbs like those. Or come up with a cone shape like on the ther models. Hmmm....
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Old 16th August 2006, 09:36 PM   #3
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Wow i've never seen those Duevels before. It looks really simple. I'd guess the ball has to be pretty reflective. Hmm what about about big marbles.
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Old 16th August 2006, 09:55 PM   #4
Ang is offline Ang  United States
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could probably use a cheap paperweight over the tweeter.... there seem to be some 4-5 inch "crystal" balls on ebay decently cheap... still was hoping for a little larger/cheaper.

If you have a lathe it wouldn't be too hard to simulate the kind of "hat" reflector on some of their more expensive stuff. How fine tuned it would have to be, don't know.
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Old 16th August 2006, 10:19 PM   #5
quiet is offline quiet  United States
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craft shops have styrofoam sphears of all sizes - just lay some resin or even paper machet

you can spear supports right through them also

i would think how ever to get the best sound - some of that complex math stuff would be needed -

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Old 16th August 2006, 11:10 PM   #6
Jaime is offline Jaime  Uruguay
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The easy way
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Old 17th August 2006, 07:58 AM   #7
Rudolf is offline Rudolf  Germany
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You should find a lot of hits when searching for "omnidirectional " in this forum.

Regarding the ball as reflector: Serious omni designs seem to prefer cones as reflectors, because they give a better radiation pattern.
Easiest way to give it a try would be to look for fullrange drivers with a rising frequency response (low qts). They could work without equalisation. I know of good results with the Ciare HX 132/160.

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Old 17th August 2006, 09:17 PM   #8
radical is offline radical  United States
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You might want to look up information on other respected commercial loudspeakers that used a similar radiation/reflection technique for "omnidirectionality" such as morrison audio's
and Daniel Queen's (search US Patent database for #4134471).
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Old 29th August 2006, 05:37 PM   #9
Kensai is offline Kensai  United States
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How about using a nice fullrange driver that can be phaseplug mounted but build a plug that is basically a dowel holding up the sphere or cone? Local craft stores I know have at least baseball sized spheres that have a small flattened area on them, so they would mount to a square cut dowels end with no trouble. Then a pair of counter sunk screws in the other end of the dowel to magnetically connect with the pole piece and you're set to try it out, maybe a $3-4 mod to any cheapy driver you might want (bicone "replacement" car drivers, Pio B20, etc).

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