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80 Search Results Found |
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Forum: Speaker «»
Posted on: Fri, 02 October 2009 13:24 «»
By: Wayne Parham
Dense Interference
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Look at the concept of dense interference. When several acoustically distant sound sources (direct and/or reflected) combine, some constructively, some destructively and some in-between, what you have at any given listening position is neither a full …
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Forum: Pi Speakers «»
Posted on: Fri, 18 January 2013 16:59 «»
By: Wayne Parham
Re: Subwoofers vs budget... where do you draw the line?
…is distributed pretty evenly. This is dense interference.
To look at the difference between a wave expanding without a reflection and the interference that comes upon meeting a reflection, see the post below:
Speaker placement and wavefront launchThe…
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Forum: Pi Speakers «»
Posted on: Sun, 25 July 2010 09:37 «»
By: Wayne Parham
Modal smoothing using dense interference from multiple sound sources
…s, absolutely. Modal smoothing is done with dense interference. It's kind of the opposite approach to what you'd take to get a good point source.
In an anechoic environment (outdoors), you'd want a point source. That would ensure constructive …
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Forum: Pi Speakers «»
Posted on: Wed, 02 November 2011 11:01 «»
By: Wayne Parham
Re: Super Tweeters
…acts like multiple subs. This is called dense interference. The reverberent field is charged with an infinite number of tightly spaced phase relationships between wavefronts going every which way. This is because of the small wavelengths involved. The…
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Forum: Pi Speakers «»
Posted on: Wed, 03 December 2008 18:14 «»
By: Wayne Parham
Re: How many subs are enough?
… best to use multiple subs, and to introduce dense interference with them. Instead of trying to keep sound sources within 1/4λ - which isn't possible because of all the virtual sources via reflections - the idea is to smooth the average sound field by …
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Forum: Speaker «»
Posted on: Fri, 09 February 2007 00:52 «»
By: Wayne Parham
Re: Pattern control and mouth size
…ase. In some cases, it is desirable to have dense interference, in order to smooth the sound field. For example, if sound sources (or reflections) cannot possibly be maintained within 1/4λ, then nulls will form in certain places. One way to correct for…
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Forum: Pi Speakers «»
Posted on: Tue, 06 December 2022 14:25 «»
By: Wayne Parham
Re: 1pi Measurements
…field, which is characterized by dense interference from all the reflections in the room. Actually, I would not describe it as dense interference, more like "medium" interference. It is between the widely-spaced and clearly-defined nulls from …
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Forum: Pi Speakers «»
Posted on: Fri, 23 January 2009 18:10 «»
By: Wayne Parham
Re: Single sub bad - multi subs good
…indistinguishable from one another. This dense interference makes the sound field average in what's called the reverberent field. The approximate frequency where sound begins to act as a reverberent field is called the Schroeder frequency. Above this …
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Forum: Pi Speakers «»
Posted on: Tue, 07 March 2006 10:06 «»
By: Wayne Parham
Re: I wonder what's going on electrically?
…of the system, I always expect it to have dense interference with the adjacent tweeter just below it in frequency. It smooths the response through averaging, because the two tweeters cannot really be coherent. The tweeters form a two-element array that …
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Forum: Pi Speakers «»
Posted on: Fri, 20 June 2008 14:56 «»
By: Wayne Parham
Four π and room interactions
…a more complex interference pattern. Dense interference why the modes are less well defined.Think of the ripples on a pond when one or two rocks are thrown in, forming well defined rings spreading out from each impact. Throw in two rocks, and you'll see…
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