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64 Search Results Found |
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Forum: Pi Speakers «»
Posted on: Sat, 08 October 2011 15:30 «»
By: skywave-rider
Re: Speaker placement and wavefront launch
You've given me a lot to think about. Thank you.
I just did the water experiment, where I instigated 2 waves in a pool of water; where they converged I noticed an "adjustment" of the wavefront. Superposition I guess.
I'll have more questions...
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Forum: Pi Speakers «»
Posted on: Thu, 06 October 2011 14:46 «»
By: Wayne Parham
Re: Speaker placement and wavefront launch
I have two answers for you, one that you asked for and the other, you didn't.
First is the reason sound waves become spherical at a distance. All sound waves in free space tend to radiate this way, even if they start off as a plane wave (like from ...
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Forum: Pi Speakers «»
Posted on: Thu, 06 October 2011 11:35 «»
By: skywave-rider
Re: Speaker placement and wavefront launch
Wayne,
In some of the examples you posted above a distorted wavefront close to the speaker eventually attains a spherical shape at a distance. How can the wavefront become "aligned" like that? I always thought the wavefront very close to the spe...
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Forum: Pi Speakers «»
Posted on: Thu, 06 October 2011 00:29 «»
By: Wayne Parham
Re: Speaker placement and wavefront launch
The seven π is definitely a better choice if you have the right corners, as you've rightly observed from the illustrations. You really notice the difference in the midrange. That's not to say the four π speaker is deficient in any way - it's very good ...
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Forum: Pi Speakers «»
Posted on: Wed, 05 October 2011 23:30 «»
By: tom-m
Re: Speaker placement and wavefront launch
Hi Wayne,
At what point is a room too big for your 7pi corner horns? My room is about 18x20. I had mostly decided on building the 4pi, but this thread is making wonder if the 7pi would be a better choice for my room?
Thanks.
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Forum: Pi Speakers «»
Posted on: Wed, 05 October 2011 18:20 «»
By: Wayne Parham
Re: Speaker placement and wavefront launch
Well, that's right, Bruce. Dipoles are a different animal, and have a very different radiating pattern. I really don't think you can operate a dipole speaker close to a boundary with good results. They really need to be used in large rooms, set far aw...
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Forum: Pi Speakers «»
Posted on: Wed, 05 October 2011 18:14 «»
By: gofar99
Re: Speaker placement and wavefront launch
Hi Wayne, good stuff. I had started a long discourse on how dipoles made a mess of this and decided to can it. Those of us with ESLs and open baffle speakers have to re-think everything as a lot of the parameters interfere with each other. It took sever...
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Forum: Pi Speakers «»
Posted on: Wed, 05 October 2011 17:35 «»
By: Wayne Parham
Re: Speaker placement and wavefront launch
The illustrations show radiation from a monopole source with boundary distances relative to wavelength. You're right that different frequencies create different patterns in the room, because the speaker is a fixed distance from the boundaries. But thes...
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Forum: Pi Speakers «»
Posted on: Wed, 05 October 2011 16:23 «»
By: gofar99
Re: Speaker placement and wavefront launch
Hi Wayne, Unless I missed something (always a possibility with us old dinosaurs), this is dependent on a single frequency being radiated. With sound made up of lots of frequencies it would seem that what works at one frequency would mess up another. I...
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Forum: Pi Speakers «»
Posted on: Wed, 05 October 2011 11:44 «»
By: BeOfService
Re: Speaker placement and wavefront launch
Wow! Nice contribution Wayne. I feel educated, and will be trying some placement experiments when I get home.
Gary
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