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275 Search Results Found |
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Forum: Pi Speakers «»
Posted on: Tue, 20 December 2011 18:09 «»
By: Wayne Parham
Re: Alpha 10 modeling
Now that you've changed fb (the Helmholtz frequency), I think you probably have a pretty good model, although I think you're interpreting the charts overly cautiously. I'm tempering my interpretation of the simulations with what I know from the distorti...
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Forum: Pi Speakers «»
Posted on: Tue, 20 December 2011 17:00 «»
By: Wayne Parham
Re: Alpha 10 modeling
It looks like your red line is around 1.25mm, yes? But xmax of the Alpha 10 is 3.2mm and xlim is 9.1mm.
You can check this with distortion measurements, if you like. It stays low in the passband, and rises below it. All through the passband, distortio...
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Forum: Pi Speakers «»
Posted on: Tue, 20 December 2011 13:51 «»
By: Wayne Parham
Re: Alpha 10 modeling
Make sure you are band-limiting when you check the numbers. If you look at the mechanical limits below 30Hz or so, they're very small because the cone is unloaded below the Helmholtz frequency. Also check the easy (but easy to miss) stuff like metric v...
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Forum: Pi Speakers «»
Posted on: Mon, 19 December 2011 15:02 «»
By: Wayne Parham
Re: One Cubic Foot Subs
You're so right. Hoffman's "Iron Law" (the one that says you can have two of three: deep bass, small size or efficiency) actually was a precursor to Thiele and Small's work. It's not just a seat of the pants thing, it's actually a quantifiabl...
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Forum: Pi Speakers «»
Posted on: Tue, 29 November 2011 17:48 «»
By: Wayne Parham
Re: 3pi with Sonido SCW-300
The forward lobe will be right as long as driver spacing and crossover phase are right. That part is really a function of the crossover and of the midwoofer and horn position on the baffle.
The stock box will work with your woofer, but as you've seen...
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Forum: Pi Speakers «»
Posted on: Tue, 22 November 2011 16:13 «»
By: Wayne Parham
Re: Towers
It's not like these speakers won't distort - any speaker will when pushed hard enough. But I'm pretty sure it's the amp that is distorting. That JVC amp is only capable of 65 watts RMS and it wouldn't take much to hit that, especially when you play aro...
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Forum: Pi Speakers «»
Posted on: Sat, 08 October 2011 23:03 «»
By: Wayne Parham
Re: LAB12
I've send the plans for the three π subwoofer.
As for crossovers, there are a lot of options. The Behringer would work, as would the Rekkhorn sub crossover or the Pyle crossover. I wouldn't use the Pyle crossover unless it were modded though, so if ...
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Forum: Pi Speakers «»
Posted on: Mon, 19 September 2011 14:32 «»
By: Wayne Parham
Re: Trapezoid enclosures
In general, you can make the shape of the cabinet anything you want. The bass tuning doesn't care, unless it becomes very long and thin, in which case pipe modes setup in the bass, making it a transmission line. But in general, you can make the shape a...
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Forum: Pi Speakers «»
Posted on: Mon, 19 September 2011 10:50 «»
By: Wayne Parham
Re: Need 3-Pi plans for Lambda TD12S / B&C DE-250
The three π loudspeaker cabinet is tuned to 30Hz.
Here's a list of the Helmholtz frequency of each model for reference:
one π loudspeaker - 60Hz
two π loudspeaker - 40Hz
three π loudspeaker - 30Hz
four π loudspeaker - 40Hz
six π loudspeaker - 3...
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Forum: Pi Speakers «»
Posted on: Fri, 16 September 2011 19:30 «»
By: Wayne Parham
Re: 1pi or 2pi for surrounds?
Good to know the system chose a setting that made sense for the surrounds. I'd run the mains with high-pass at their Helmholtz frequency also, or just run them flat out. If you high-pass the mains, make it pretty low like 30Hz or 40Hz, wherever the Hel...
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