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130 Search Results Found |
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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: Fri, 09 September 2011 00:22 «»
By: Wayne Parham
Re: Contemplating a change
Well, I guess it's no surprised I'm biased, but then again, the trend towards uniform directivity among experts is clear. Controlled, uniform directivity is always welcomed, but in a small room, it's even more important because reflections are so much s...
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Forum: Pi Speakers «»
Posted on: Fri, 02 September 2011 09:43 «»
By: Wayne Parham
Re: 4pi Commercial Dinner Theater Build
Answers by numbers:
1. If I understood your picture properly, the west wall is on the left, where the mains are. So that would be where you would put flanking subs. Distant subs would be put somewhere else, more distant from the mains. The low-pas...
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Forum: Measurement «»
Posted on: Fri, 29 July 2011 01:46 «»
By: Wayne Parham
Re: The Acoustic Center: How it applies to Loudspeaker Measurements
Absolutely. At midrange frequencies up, the reverberent field is usually almost as loud as the direct sound. So the loudspeaker's polar response is important, because sound radiating in all directions provides the energy for the reverberent field. You...
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Forum: Pi Speakers «»
Posted on: Mon, 27 December 2010 10:12 «»
By: Wayne Parham
Re: Constant directivity verses on-axis EQ for non-uniform directivity (aka baffle step filters)
Glad it was helpful. I hope it made sense and wasn't too abstract.
I find myself getting a lot of the same questions and comments over the years, and I tend to link to past posts in reply. I had a list of about a dozen posts that sort of covered the...
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Forum: Pi Speakers «»
Posted on: Wed, 21 July 2010 15:58 «»
By: Wayne Parham
Re: Kilomax-18
You betcha. Put it in a 10ft3 cabinet tuned to 25Hz. It will actually work well in even larger boxes, up to 20ft3, if you have the space for a cabinet that large. Give it plenty of vent area, at least 50in2. That will work very well down low.
Belo...
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Forum: Pi Speakers «»
Posted on: Fri, 02 July 2010 15:02 «»
By: Wayne Parham
Crossover optimization for DI-matched two-way speakers, revisited
I usually fine-tune the position of the forward lobe by adjusting the low-pass circuit slightly. I know within about 10° where the centerline of the forward lobe will be before I start, because of mathematical models or previous design efforts or both. ...
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Forum: Pi Speakers «»
Posted on: Thu, 01 July 2010 09:51 «»
By: Wayne Parham
Re: Thanks Wayne! "4Pi" success.
Those speakers look fantastic! Three cubic feet tuned to 38Hz, yes, those are the same as four π's. I like the two-tone look very much, and in fact, my surrounds are done just like that - two π's with the exact same finish, darker sides and lighter fro...
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Forum: Pi Speakers «»
Posted on: Wed, 16 June 2010 18:49 «»
By: Wayne Parham
Re: 4pi benefits
Actually, as much as I like the Altec 811 horn, there's no way to get the polar response right, or even close. You can make the on-axis response right, but not off-axis. So you have to sit with the speakers directly facing you for them to sound good.
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Forum: Pi Speakers «»
Posted on: Tue, 15 June 2010 01:39 «»
By: Wayne Parham
Re: 4pi with altec 807?
I'll send plans.
You can use the same cabinet, of course, and that will at least give you a nice midwoofer to match your tweeter. You'll just have to dial-in the crossover, and since you have an active unit, that will give you some fun tinkering with...
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