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139 Search Results Found |
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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
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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 …
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Forum: Pi Speakers «»
Posted on: Wed, 13 October 2010 13:09 «»
By: Wayne Parham
Dealing with internal standing waves
…there. What you won't know is what the internal standing waves do to response. So build the cabinet and make some acoustic measurements. You can even do an impedance sweep if acoustic measurements are hard to do.
If you see any noticable blips, …
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Forum: Pi Speakers «»
Posted on: Sun, 20 January 2013 13:41 «»
By: zheka
Re: 4 PI by Andy
…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 form the harmonics, not main content
Would you …
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Forum: Pi Speakers «»
Posted on: Mon, 18 October 2010 16:02 «»
By: Wayne Parham
Internal standing waves and port position
… issue. The thing you're concerned about is internal standing waves. You can't prevent them from lining up inside the box, but you can prevent them from adversely affecting the response curve. The way to do this is to put the port in a benign position …
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Forum: Pi Speakers «»
Posted on: Sun, 20 January 2013 13:01 «»
By: Wayne Parham
Re: 4 PI by Andy
…low-pass frequency must be low enough that internal standing waves do not develop in the passband.
Otherwise the rules change.
If you run a big box like the one you posted as a flanking sub, then it will receive some lower midrange frequencies, and …
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Forum: Pi Speakers «»
Posted on: Mon, 07 May 2012 12:15 «»
By: Wayne Parham
Re: 4Pi speaker tweek
…changing box size/shape is it changes the internal standing waves. These cabinets are tuned with Helmholtz resonance, but that doesn't prevent transmission line effects from inadvertently coming into play. We don't want that.
It isn't that …
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Forum: Pi Speakers «»
Posted on: Sun, 30 May 2010 15:13 «»
By: Wayne Parham
Re: 2 pi tower variants
… matter" but in fact what I mean is the internal standing waves are attenuated rather than incorporated as a tuning mechanism like a horn or transmission line. But even that being the case, it is still important to consider internal standing wave …
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Forum: Pi Speakers «»
Posted on: Mon, 04 May 2020 12:47 «»
By: Wayne Parham
Re: Definimax 4012HO - End of Life
…Martin King's spreadsheets to help analyze internal standing waves. I used them to design my larger model full-range loudspeakers, adjusting the size and shape of the box and setting the position of the midwoofer and the port for minimum standing wave …
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Forum: Pi Speakers «»
Posted on: Mon, 01 April 2013 13:38 «»
By: Wayne Parham
Re: Two PI: A Little Bright OR Light in the Bass?
… node of a standing wave. All cabinets have internal standing waves, and that's why we use insulation inside, to attenuate the standing waves.
Large cabinets are particularly sensitive to cabinet mods because internal standing waves are at low enough …
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Forum: Speaker «»
Posted on: Thu, 22 December 2011 08:14 «»
By: Wayne Parham
Re: Golden ratio for loudspeaker cabinets
…mean, it doesn't hurt, but the truth is that internal standing waves can set up in a golden ratio box just as easily as they do in any other shape.
Another belief is that trapezoidal cabinets and other non-parallel shapes will help. The belief, in …
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