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Forum: Pi Speakers «»
Posted on: Mon, 07 July 2003 22:08 «»
By: Adrian Mack
Diffraction and Baffle Spacing - critic this design?
Hi guys,Above is a diagram showing something that I might be building. As for crossovers, I'm using the 1Khz two-way Pi crossover, and the other crossovers are all active, probably 2nd order LR or something (these are transient perfect?). Now... onto the m...
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Forum: Pi Speakers «»
Posted on: Sat, 05 July 2003 08:10 «»
By: Adrian Mack
Re: Pi Speakers!
Hey Wayne,Thanks for th like a 4pi. Specs are as follows:Fs=42HzRe=5ohmQms=5.36Qes=0.28Qts=0.27Vas=131LMms=125gSd=900cm^2BL=24.2 TmLe=2.15mHXmax= 5.5mm (length - gap height /2 method). Pe= 700Wrms (pink noise tested). Has 4" VC. Its designed for use from 3...
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Forum: Pi Speakers «»
Posted on: Mon, 30 June 2003 17:58 «»
By: Chris R
making freq. response graph
Hi Wayne, If I have a 'scope and a swept audio generator, what elseis required to produce a frequency respose graph? Specifically,what's required to plot the response of an active crossover?Would I need some sort of a log amp to measure in dB? Doesthe ...
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Forum: Pi Speakers «»
Posted on: Sat, 28 June 2003 07:04 «»
By: Wayne Parham
Digital Signal Processing
Digital Signal Processing is used in practically everything these days. Wherever you find processors in equipment that interfaces with the "real world," you'll find DSP hardware and software there too. In these devices, you'll find the simplest functions...
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Forum: Pi Speakers «»
Posted on: Sat, 24 May 2003 12:25 «»
By: Triodeuser
Suggestions for horn sub needed
Thinking about Labsubs - but they're a little large - I might could use a cornerhorn - but in one of the corners there is only about 3 ft of side wall before there is a french door that indents about 3" or so from the trim. I usually leave that particular ...
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Forum: Pi Speakers «»
Posted on: Thu, 22 May 2003 04:41 «»
By: Adrian Mack
Re: Xover
Hey Wayne.Basically, what I will be using is:JBL 2370A with PA-D45 compression drivers from 1KHz - ~18KHzEminence Alpha 6 on tractrix midrange horn, 300Hz-1KHzJBL 2226H 60Hz - 300Hz, just as direct radiator, sealed boxThe PA-D45's and Alpha 6 is what will ...
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Forum: Pi Speakers «»
Posted on: Wed, 14 May 2003 16:48 «»
By: Michaelz
Re: Questions to Michaelz
What driver(s) do you use?What are the dimensions of the box(es)?Are you using reflex or (as it appears) closed box - & do you use any electronic equalisation/compensation?It's a square box with one corner cut off. The square sides are 2' long, based on t...
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Forum: Pi Speakers «»
Posted on: Tue, 13 May 2003 12:44 «»
By: tdc
The Ps (Sam and Wayne) made me do it
After reading the posts about the JBL 4648s upper limit being controlled by interference between the dual woofers a bit above 800 hz. I decided to try something new. The pi design use a single 2226 to 1600hz but the plan is now stay down at 500 hz with th...
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Forum: Pi Speakers «»
Posted on: Mon, 10 March 2003 21:57 «»
By: Wayne Parham
Protection caps
If the crossover (including driver reactance) is underdamped in or near the passband of the device, you will hear it. An underdamped crossover filter causes a peak that can range anywhere from a mild lift to a huge 10dB peak. Rarely will you find a voice...
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Forum: Pi Speakers «»
Posted on: Mon, 10 March 2003 17:34 «»
By: Robert Hamel
Active crossover question with protection cap
Hello WayneI guess from looking at your document that if you have a series protection cap you need a dampening resistor across the driver or you will get LC peaking like in your example. Would this have an audible effect even with an active 4th order L/R c...
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