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275 Search Results Found |
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Forum: Pi Speakers «»
Posted on: Fri, 16 September 2011 09:41 «»
By: Wayne Parham
Helmholtz frequency of each model
It occurred to me that it might be helpful to list the Helmholtz frequency of each model here for reference. You can high-pass at this frequency to limit excursion where the driver is unloaded. There is very little sound produced below this frequency a...
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Forum: Pi Speakers «»
Posted on: Thu, 15 September 2011 12:35 «»
By: Wayne Parham
Re: 1pi or 2pi for surrounds?
For home hifi and home theater, I like running the mains and surrounds full range because of the benefits in the modal region. Blending multiple sound sources smoothes the room modes.
If you were running in a prosound environment, it would be a diffe...
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Forum: Pi Speakers «»
Posted on: Thu, 01 September 2011 13:19 «»
By: Wayne Parham
Re: Damping material placement
I hate to say it but with all those mods, all bets are off. However, insulation spanning the cross-section is a good idea in general for large cabinets used into the midrange. It helps damp standing waves at midrange frequencies where insulation lining...
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Forum: Craftsmen «»
Posted on: Sat, 13 August 2011 21:08 «»
By: Wayne Parham
Re: Tuning Vents and Resonators
That's basic Helmholtz resonance, so you might look up Helmholtz resonators and Thiele/Small theory.
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Forum: Craftsmen «»
Posted on: Thu, 04 August 2011 16:32 «»
By: Wayne Parham
Re: Portable Metal Resonator for Musical Instrument
I think I get what you're going for. Sometimes, working with sheet metal, you'll get a piece that is fun to shake and get those "wocky-wocky" sounds from. Or twist it back and forth to get a sort of slide guitar sound.
Seems to me the thin...
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Forum: Pi Speakers «»
Posted on: Thu, 21 July 2011 07:43 «»
By: Wayne Parham
Re: 2 Pi tower Question
The insulation is there solely to damp standing waves nodes. It is there to attenuate midrange frequency upwards. All we want in the cabinet interior is the bass range near the Helmholtz frequency.
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Forum: Pi Speakers «»
Posted on: Wed, 22 June 2011 07:46 «»
By: Wayne Parham
Re: SB34NRX75-6 for Three Pi?
Here's the crossover design process:
Crossover optimization for DI-matched two-way speakersFor box tuning, use any of the box modeling programs to select a box size and Helmholtz frequency appropriate for the midwoofer you'll be using. You'll also need...
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Forum: Speaker «»
Posted on: Tue, 14 June 2011 09:25 «»
By: Wayne Parham
Re: Electro Voice TL-606 enclosure with 3 PI components?
The (Helmholtz) box tuning is relatively easy. The Delta 12LF works well in boxes from 3.0ft3 to 6.0ft3 tuned to 30Hz, and can be used in boxes a little larger, up to about 8.0ft3, albeit with slightly lower tuning, from 25Hz to 28Hz. Just about any lo...
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Forum: Pi Speakers «»
Posted on: Mon, 31 January 2011 21:05 «»
By: Wayne Parham
Re: 3 pi speaker
The Econowave is a good basic design, fundamentally the same thing as the three π and four π loudspeakers it was based on. That said, I'd stick with one of the stock π model loudspeakers. They are designed and optimized for the drivers and horns chosen...
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Forum: Pi Speakers «»
Posted on: Wed, 19 January 2011 11:21 «»
By: Wayne Parham
Re: 2 π tower: two answers more
Regarding spikes, mats or rubber feet, I do not feel strongly one way or another about them. I'm not really looking for solid coupling to the floor, nor is it important that it be decoupled. What I don't want is vibration that would cause a buzzing sou...
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