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130 Search Results Found |
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Forum: Pi Speakers «»
Posted on: Thu, 24 January 2008 20:53 «»
By: Wayne Parham
Room gain, pressure region, modal region and reverberent region
The seven π bass bin is overdamped so it conjugates nicely with the bass lift from room gain and corner loading.
See the charts below. The first one is the response of the cabinet if it were placed in free space. It is overdamped and has a gradual r...
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Forum: Pi Speakers «»
Posted on: Mon, 26 November 2007 20:43 «»
By: Wayne Parham
Re: Imaging with Pi Speakers
I've always found speakers that project a nearly uniform radiation pattern sound most natural.The thing is, the opposite case - speakers with very non-uniform radiation pattern - create a pinpoint "pocket" where sound is best. The trick is to carefully p...
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Forum: Pi Speakers «»
Posted on: Mon, 26 November 2007 20:09 «»
By: Wayne Parham
Re: why not
I've built some smaller three-way speakers, some that I thought were quite good. But they never work as well off-axis, which means the reverberent field isn't as uniform. You can't make a small midrange with unform directivity. If it's small, it must be...
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Forum: Pi Speakers «»
Posted on: Sun, 11 November 2007 16:42 «»
By: Wayne Parham
DI matching
DI is an abbreviation for directivity index. DI matching is a design philosophy of making crossover near the frequency where the direct radiator directivity collapses to be near that of the horn. It makes off-axis response closer to a straight line, act...
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Forum: Pi Speakers «»
Posted on: Sun, 28 October 2007 20:13 «»
By: Wayne Parham
Re: Theater Seven Pi Question.
You don't want to do that. The midhorn needs to sit squarely on top of the bass bin for several important reasons. The midhorn and bass bin need to be within 1/4λ of each other for proper summing. The crossover depends on that. That's the main thing, ...
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Forum: Pi Speakers «»
Posted on: Thu, 28 June 2007 16:51 «»
By: Wayne Parham
Re: Polar, not bears.
You can design a speaker with any directional pattern you like. Prosound speakers tend to be offered with narrower patterns than home hifi speakers. For example, you can find prosound speakers with 90°, 60° and even 40° patterns. Most home hifi speaker...
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Forum: Pi Speakers «»
Posted on: Sat, 14 April 2007 09:53 «»
By: Wayne Parham
Re: Fitting corner horns into a multi-use room
The seven π cornerhorns will work in that arrangement, depending of course that the shelves don't contribute a sound of their own (buzzing or resonating). Also note that the strings and sounding board of the piano will produce sympathetic vibrations, whi...
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Forum: Speaker «»
Posted on: Wed, 08 November 2006 08:44 «»
By: Wayne Parham
Re: Your Experiences With Constant Directivity Horns
I prefer constant directivity horns. When constant directivity is observed through the midrange upwards, the reverberent field is more uniform. The sound is much more natural throughout the room. This requires midrange and tweeter horns be matched, hav...
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Forum: Pi Speakers «»
Posted on: Sun, 05 November 2006 10:33 «»
By: Wayne Parham
Re: DI Matching
Directivity Index is abbreviated DI. There is a pretty good explanation of it in Chapter 3 of the JBL Sound System Design Reference Manual. DI matching is a design philosophy that seeks to crossover between subsystems where directivity matches. If this...
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Forum: Pi Speakers «»
Posted on: Tue, 05 September 2006 15:04 «»
By: Wayne Parham
Re: Learned some more audio truth outdoors
Pretty much every speaker you've ever seen me do has this as one of its main design objectives. Controlled directivity is part and parcel of the design process. That's why my loudspeakers sound consistent throughout the room, and tonal balance is good e...
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