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392 Search Results Found |
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Forum: Pi Speakers «»
Posted on: Mon, 15 April 2013 00:45 «»
By: Wayne Parham
Re: 2 pi tower folding?
Looks like a great cabinet, and the (no grille) measurement results look pretty similar to what I get from the towers, so I think you've kept the internal standing waves at bay. Nice job!
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Forum: Pi Speakers «»
Posted on: Tue, 09 April 2013 19:23 «»
By: Wayne Parham
Re: Insulation inside of speaker: Spray Foam?
I don't recommend insulation for subs, although there's no harm installing it. It's just that if the subs aren't sent any content at frequencies where internal standing waves can develop, there's no need for damping material.
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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?
I love the looks of that cabinet. The cork front is a nice touch, as is the rabbet edge. Good work!
Looks like a nice little Bottlehead system too.
The 20Ω resistor across the tweeer is there just to shunt the Zmax peak around 680Hz. It prevents...
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Forum: Pi Speakers «»
Posted on: Sun, 31 March 2013 15:22 «»
By: Wayne Parham
Re: Two PI: A Little Bright OR Light in the Bass?
Yeah, having the port too short will make the speaker lack bass in the 60Hz region and overexaggerate midbass and lower midrange in the 80Hz to 120Hz region. Then not having the right damping material will make matters worse, tending to make the speaker...
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Forum: Pi Speakers «»
Posted on: Wed, 27 March 2013 23:49 «»
By: Wayne Parham
Re: Diaphragm Breakup Modes
Yes, those are breakup modes. Standing waves that form ripples across the surface of the diaphragm. The lines show the center of the fold, where the diaphragm is actually not moving. It is the zero-crossing point of a standing wave along the surface, w...
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Forum: Pi Speakers «»
Posted on: Wed, 27 February 2013 17:25 «»
By: Wayne Parham
Re: Cabinet design, port placement and internal standing waves
He used to supply a spreadsheet for ported cabinets tuned primarily using Helmholtz resonance. While his main focus was transmission lines, he also had a spreadsheet that covered bass-reflex boxes at one time. I'm sure he still does, or perhaps he morp...
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Forum: Pi Speakers «»
Posted on: Wed, 27 February 2013 17:06 «»
By: dheflin44
Re: Cabinet design, port placement and internal standing waves
Looks like the cost is only $25 for DIYers. Since the main app is modeling transmission lines, it's going to take a little studying to figure out how to model what I'm trying to do.
Thanks,
Darrell
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Forum: Pi Speakers «»
Posted on: Wed, 27 February 2013 15:50 «»
By: Wayne Parham
Re: Cabinet design, port placement and internal standing waves
Yes, Martin King wrote an excellent modeling tool in the form of a series of MathCad spreadsheets. They used to be available for download, but I think he may have pulled them because he felt commercial users were taking advantage of him. I can empathi...
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Forum: Pi Speakers «»
Posted on: Wed, 27 February 2013 15:16 «»
By: dheflin44
Re: Cabinet design, port placement and internal standing waves
Wayne,
Are there any simulators available that would predict where the internal high pressure nodes will be?
Thanks,
Darrell
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Forum: Pi Speakers «»
Posted on: Fri, 22 February 2013 15:45 «»
By: Wayne Parham
Re: One Pi Speaker
Yes, that's the one.
Don't lean it back like that. Keep the baffle normal (perpendicular) pretty much lined up with the listeners. The baffle normal is the centerline of the forward axis. Aim this at the listeners. Horizontal movement is fine, you...
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