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275 Search Results Found |
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Forum: Pi Speakers «»
Posted on: Fri, 22 February 2013 11:13 «»
By: Wayne Parham
Re: One Pi Speaker
Don't run high-efficiency midwoofers sealed. If they're just being used as midrange drivers, that's OK but if they are to be midwoofers, they really need the excursion reduction from port tuning. Besides, the phase change is in the modal region where w...
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Forum: Pi Speakers «»
Posted on: Sun, 27 January 2013 12:59 «»
By: Wayne Parham
Re: 4Pi loudspeaker performance data
If you are going to run high power levels, then sure, a high-pass filter at the Helmholtz frequency makes sense.
Helmholtz frequency of each model
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Forum: Pi Speakers «»
Posted on: Sun, 20 January 2013 13:41 «»
By: zheka
Re: 4 PI by Andy
Thank you very much.
The box I am working on is also 10ft^3. The longest side is about 36" internal. It would not be used as true flanking sub but it may be low passed as high as 120Hz. If standing waves indeed form in this case, they would come ...
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Forum: Pi Speakers «»
Posted on: Sun, 20 January 2013 13:01 «»
By: Wayne Parham
Re: 4 PI by Andy
Damping material is not needed in traditional subs run outdoors, distributed subs in a multisub arrangement, or pretty much any subwoofer that is acoustically small. But that's a key: The subwoofer cabinet must be acoustically small, which means the lo...
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Forum: Pi Speakers «»
Posted on: Sat, 22 December 2012 09:46 «»
By: Wayne Parham
Re: 4PI Cabinet plans / question
That's one of the main reasons I prefer vented boxes. They reduce excursion while at the same time adding extension. And in the modal region, the changing phase of a Helmholtz resonator is unimportant, so it's definitely better to run vented mains.
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Forum: Pi Speakers «»
Posted on: Fri, 05 October 2012 23:15 «»
By: Wayne Parham
Pi Speakers FAQ
The π Speakers forum has a wealth of information, and the search feature provides a way to access all of it easily. However, this page offers introductory answers to frequently asked questions about our line of loudspeakers and the design philosophies we...
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Forum: Pi Speakers «»
Posted on: Fri, 31 August 2012 18:28 «»
By: Wayne Parham
Cabinet design, port placement and internal standing waves
There are three things that come into play with the cabinet geometry and the arrangement of the woofer and port(s).
First is the Helmholtz frequency, which is something pretty much all DIYers think about. When you run a T/S simulation, this is primar...
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Forum: Pi Speakers «»
Posted on: Tue, 07 August 2012 14:17 «»
By: Wayne Parham
Re: 3 Pi and 4 Pi comparison
As I said earlier, I can sure understand your desire to re-use your original 1950s cabinets. I would probably do the same thing. But please do remember what I said about standing waves, if sound quality is important to you. Because it isn't really a...
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Forum: Pi Speakers «»
Posted on: Thu, 12 July 2012 23:17 «»
By: 48h350
Re: Helmholtz formula
Great.
I get 8.4 inches long port with a diameter of 4 inches in a 15"x15"x15" box with a Helmholtz frequency of 22.87 Hz in a box of 1.27 cu ft. of volume.
Thanks for the help Wayne.
massimo
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Forum: Pi Speakers «»
Posted on: Thu, 12 July 2012 22:11 «»
By: Wayne Parham
Helmholtz formula
15" x 15" x 15" would be a nice box size for that woofer.
But PiAlign won't calculate a port for that box. It was designed to recommend a cabinet size, used mostly for mains cabinets really. It's literally a 1970s program. Not that e...
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