Sideways Dipole Bass

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sdclc126

sdclc126

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Joined 2005
#1
Hi,

Does dipole bass need to face forward into the listening room in order to work, or does it not matter at the lower frequencies?

I'm purely concerned with aesthetics here actually, by making the woofers less visible from the front. I was thinking of taking an H-frame and turning it 90 degrees to the side so a finished panel would face forward, and then placing the mid/tweeter panel in the normal location above that.

For saving vertical space, could the H-frame be placed horizontally also? Perhaps a taller, line array type mid/tweet main panel could then go above the lower H-frame.

One more - picture a "tower" H-frame, with four+ woofers - turned sideways, could the now front-facing panel serve as a baffle for mid/tweet? I'm thinking the only way it could work is if the front panel is widened with "wings," extending out beyond the width of the H-frame. But then would the H-frame interfere with the dipole response of the mids?

Thanks.
 
#5
Yes I forgot about that - like the Linkwitz dipole woofer for the Phoenix. Can't do what I had in mind with an H-frame but can with dipole w/ woofers stacked and facing same direction.

I like that anyway - it saves a lot of space.
 
#7
sdclc126 said:
I wasn't sure if this would apply to bass, it being less directional. I suppose there would still be a null though.
Click to expand...


This applies especially to bass. Its upwards in frequency where the dipole stops being a dipole(usually above a few hundred Hz).

You can use a variation of Ripole/W-baffle (I guess even a "half ripole" would do the job - I mean, only one driver mounted on the side of an U-Baffle)
 
#11
y8s said:


you're still on the null axis. and a reflected null is still a null.
Click to expand...


Wouldn't the reflected null be a double null? In fact, if the wavelength and the distance from a boundary were such that they became conjoined on a long sustained frequency, it might actually be repeated to the extent that a "Blacknull" would be created and all the planet's Life-force would be sucked into the vortex of the "Null and Void."

Now I have to ask: Is this what you want, right before the Holidays?

Think of all those Children, that have been good all year, just so Santa would bring them something nice.

What type of person could be that mean?

Best Regards,
TerryO
 
#12
TerryO said:



Wouldn't the reflected null be a double null? In fact, if the wavelength and the distance from a boundary were such that they became conjoined on a long sustained frequency, it might actually be repeated to the extent that a "Blacknull" would be created and all the planet's Life-force would be sucked into the vortex of the "Null and Void."

Now I have to ask: Is this what you want, right before the Holidays?

Think of all those Children, that have been good all year, just so Santa would bring them something nice.

What type of person could be that mean?

Best Regards,
TerryO
Click to expand...

Well I guess I'm not gonna build it then - too dangerous.

Wait a minute - could this be used to mitigate Global Warming?
 
#14
I guess you're right about sitting in the null - I'll have to try turning my w-frame sideways to see how it works.
Has anyone seen the Gradient Helsinki?
I've just seen pics, ho specs posted that I can find.
I wonder how they are getting away from the null problem.
 
#16
Cool looking speaker - so can you have sideways dipole bass with one woofer, or multiple woofers facing the same direction, or do you still have a null? I guess the physics remains the same.

I suppose a corner would give early reflections, possibly overcoming the null, but then I wonder if you'd really be getting a good dipole effect.
 
#18
sdclc126 said:
Cool looking speaker - so can you have sideways dipole bass with
I suppose a corner would give early reflections, possibly overcoming the null, but then I wonder if you'd really be getting a good dipole effect.
Click to expand...

I think the dipole effect in bass reproduction come from the absence of a box, this should be same with the corner dipole.

Stephan
 
#20
I have just hung a dipole panel in a church. At the top are a pair of Eminence Gamma 15s for the lows.
Even in the supposed null the low frequencies are audible, as a result of the modal distribution throughout the space. The room is a "problem" acoustically, because of poor proportional ratios. Even with that limitation the low frequency distribution is tolerable - if you don't move from one place to another any faster than a "respectful" pace - as one is expected to walk around a church!
For further discussion, see: Large Scale Open Baffle. We are in the process of commissioning the device in the next couple of days. Additional pictures are still being posted.

Cheers!
 
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