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Old 14th July 2010, 04:07 PM   #1
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Default Dipole frame options?

These are the two configurations I have come up with so far to keep height down a bit. Of the two, is one much better than the other? I would assume the W shaped baffle will make a more even front and rear wave since the drivers are equal and opposite in direction. I do have some conserns using angles smaller than 45 degrees, but it is imperative to keep the height down a bit.

P.S. ignore the tweeters. I'm still playing with the top baffle configuration.

Ideas/thoughts?

Thanks,

Blair
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Old 14th July 2010, 09:13 PM   #2
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Quote:
Originally Posted by deicide67 View Post
These are the two configurations I have come up with so far to keep height down a bit. Of the two, is one much better than the other? I would assume the W shaped baffle will make a more even front and rear wave since the drivers are equal and opposite in direction. I do have some conserns using angles smaller than 45 degrees, but it is imperative to keep the height down a bit.

P.S. ignore the tweeters. I'm still playing with the top baffle configuration.

Ideas/thoughts?

Thanks,

Blair
Hi Blair,

If the drawing is approx. to scale, I assume the woofers are 10's? What high do plan to cross them at? Are you concerned about floor reflection due to the driver's angle?
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Old 14th July 2010, 09:16 PM   #3
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Hi,

Yes, the more and more I think about it and lay this out, it makes more sense to make them all vertical. They are 10" drivers. I'm just trying to keep my tweeter and mids at ear level. I plan to cross around 2-300Hz.

Blair
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Old 14th July 2010, 09:48 PM   #4
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If you can afford some width you could put
the woofers in a square and the mid-tweets
in between............

W.........W
..T..M..T..
W.........W
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Old 14th July 2010, 09:50 PM   #5
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Thanks!

That is the issue though. Trying to get a dipole to fit in a conventional space!

I'm trying to get it to have a fairly small footprint, while having the displacement in numbers to have decent bass.

Blair
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Old 14th July 2010, 10:23 PM   #6
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Just a woofer in bandpass enclosure ,4 in dipole would be such a waste.
Quote:
W.........W
..T..M..T..
W.........W
Two tweeters ,horizontally aligned . Never seen it .There must be a reason .
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Old 15th July 2010, 11:48 AM   #7
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Quote:
Originally Posted by matevana View Post
Hi Blair,

If the drawing is approx. to scale, I assume the woofers are 10's? What high do plan to cross them at? Are you concerned about floor reflection due to the driver's angle?

Driver selection is an important part. You can get respectible bass output from only one or two 10" drivers, if they can move enough air and have a fairly high QTS. Having only 2 woofers vertically mounted should put the mid/tweeter at an appropriate (ear) height.

I have found, for example, that my dipole with 1 X 10" driver (Qts .62, xmax 13mm, Fs 33Hz) has better quality and produces better quantity of low frequency sound than a friend's dipole with a 15" pro audio driver. My baffle is also less than half the size. The only advantage he may have is effeciency, but watts are fairly cheap these days, especially in the LF's where a class D amp can be used easily on the cheap.
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Old 15th July 2010, 12:56 PM   #8
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If you are going to use a separate amp or use an active X-over you won't need four woofers, your mid/tweet will give out before two 10" will.
You did not draw a dipole (as it looks like there is a back side in your drawings). I assume you ment a modified W frame open baffle?
I've made several sets of open baffles, two with 15 inch Emminence alpha's and one with Goldwood 18inch. all using Audio Nirvana 10" or 12".
They all used a separate plate amp (The quietest-no ground loop was the M & K plate amp).
Two 10" would give the same size as one 15", and I can tell you that for balanced sound, I had the plate amp set about halfway. Playing music at just under 100dB, I could crank the plate amp higher!,
SO, in my opinion, unless you like the look, there isn't much reason to use more than 2 ten inchers (Unless you want a passive crossover and are using one amp),
If so, spread the angle out as much as possible. If your using a Full range driver, don't worry if the center is a little high, as this may help mitigate the rising high end any way.
Hope this helps,
Paul
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Old 15th July 2010, 01:24 PM   #9
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Thanks guys!

This all makes sense to me. I am looking at a 9mm xmax driver with a relatively high Qts. 1.35.

A pair should do well, but three or four would put my mind at ease much better as far as limitations. Then again, 30" is not too bad to place the mid and tweeters. Mu current speakers have the center of the mid at about 43".

I would be using separate 100w plate amps in each speaker with a shelving circuit.

Blair
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Old 15th July 2010, 01:35 PM   #10
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Quote:
Originally Posted by pforeman View Post
I've made several sets of open baffles, two with 15 inch Emminence alpha's and one with Goldwood 18inch. all using Audio Nirvana 10" or 12".
They all used a separate plate amp (The quietest-no ground loop was the M & K plate amp).
Two 10" would give the same size as one 15", and I can tell you that for balanced sound, I had the plate amp set about halfway. Playing music at just under 100dB, I could crank the plate amp higher!,
Do you have pictures you can either send me or link to? How wide are your baffles on your 10" drivers?

Oh, and yes, this is more of a modded W frame.

Thank you!

Blair
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