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446 Search Results Found |
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Forum: Pi Speakers «»
Posted on: Mon, 24 September 2012 14:06 «»
By: Wayne Parham
Re: Six Pi Review
As an aside, measurements made in a trihedral corner outdoors naturally do not show room modes, the response down low is ruler-flat. But indoors, room modes take over and make hot spots and dead spots, causing ripples in response. I'm sure in your case...
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Forum: Pi Speakers «»
Posted on: Thu, 20 September 2012 20:46 «»
By: rkeman
Re: Six Pi Review
The current system has been evolving for about five years. It started out with a number of highly respected audiophile speakers, none of which integrated well with the oddly shaped asymmetric room. Eventually research into how to decrease room effects led ...
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Forum: Pi Speakers «»
Posted on: Thu, 20 September 2012 16:40 «»
By: rkeman
Six Pi Review
Corners can be the undoing of a loudspeaker. Bass becomes exaggerated. Close proximity to the walls results in early reflections that make imaging vague and the highs grainy. Most manufacturers recommend placing loudspeakers well away from corners and the ...
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Forum: Speaker «»
Posted on: Mon, 20 August 2012 21:58 «»
By: Wayne Parham
Re: Klipsch KP-3002 Crossover Mods
The H290C horn I use has an oblate spheroidal flare profile, something often called a waveguide these days. It provides constant beamwidth, smooth response and minimum wavefront distortion.
The R1/R2/C1 network is used to tailor response for compress...
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Forum: Pi Speakers «»
Posted on: Thu, 16 August 2012 10:12 «»
By: Wayne Parham
Re: H290C Horn/Waveguide
The H290C was designed from the start to be a bolt-on upgrade, that would require a minimum of crossover changes. The acoustic centers are in the same place and the patterns are similar, so the pre-2012 crossover used with the old H290 horn can be used a...
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Forum: Pi Speakers «»
Posted on: Thu, 09 August 2012 10:38 «»
By: Wayne Parham
Re: H290C Horn/Waveguide
Some have asked why it is important to maintain 90° beamwidth in the horizontal, and why 100° or more is less desirable. For example, one of our friends here recently evaluated another similar waveguide/horn with ~100° coverage. The other horn was tout...
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Forum: Pi Speakers «»
Posted on: Thu, 09 August 2012 09:21 «»
By: Wayne Parham
Re: 7 PI Plans
Bass response of the seven π cornerhorns is the same as the four π speakers. What's different is the behaviour of sound at frequencies above midbass. The corner loading of the woofer and the midhorn prevent any self-interference from nearby boundaries,...
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Forum: Pi Speakers «»
Posted on: Thu, 12 July 2012 08:08 «»
By: Wayne Parham
Re: H290C Horn/Waveguide
Measurements
all measurements taken using DE250 driver
mounted on infinite baffle, i.e. half-space
drive signal 8.4v
microphone distance 3M
Impedance
The impedance graph shows first 1/4λ mode is around 800Hz, and 1/2λ about 1.6kHz. You c...
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Forum: Pi Speakers «»
Posted on: Thu, 07 June 2012 10:36 «»
By: Bill Epstein
Re: Meniscusaudio Inductors
Yes! Don't do what I say, do what I do!
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Forum: Pi Speakers «»
Posted on: Thu, 07 June 2012 09:07 «»
By: Wayne Parham
Re: Meniscusaudio Inductors
We use Erse Super Q (laminated steel-core) coils in the constant directivity cornerhorns - but do not use them in the matched-directivity two-ways. The woofer in the cornerhorns is only used for bass and so an iron core is fine. But the two-ways run th...
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