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29 Search Results Found |
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Forum: Pi Speakers «»
Posted on: Tue, 07 April 2009 17:11 «»
By: Wayne Parham
Re: B&C DE 250 and compensation
Remember that the Econowave crossover used on the AK site is a derivative of my π crossover. It's basically the same as what I'd use for an 8dB network, combined with an L-Pad for variable tweeter output. The L-Pad changes the scale of the R1/R2 values...
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Forum: Pi Speakers «»
Posted on: Sat, 07 February 2009 11:36 «»
By: Wayne Parham
Tweeter circuits for constant directivity horns and waveguides
I have used Erse capacitors, in fact, they're in stock now and they are used on some of the crossovers I provide as kits or in finished products. I consider them to be about the same quality level as Solen caps. Here's a post I wrote a little while bac...
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Forum: Pi Speakers «»
Posted on: Thu, 17 April 2008 23:25 «»
By: Wayne Parham
Re: Vifa DX25TG-05 vs. Vifa XT25TG30-04
I'm not sure, but I doubt it. The impedance of ribbon tweeters is usually pretty resistive and doesn't need extra damping or impedance compensation. You may need to pad the tweeter though. If so, I think probably a standard L-Pad configuration is appro...
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Forum: Pi Speakers «»
Posted on: Sun, 24 February 2008 16:54 «»
By: Wayne Parham
Top octave augmentation for compression horn tweeters
The typical 8Ω L-Pad is designed to maintain impedance of 8Ω to the source. This, of course, assumes two things, neither of which are true. The first assumption is that the load is a fixed 8Ω resistance. Loudspeakers aren't. The second assumption is ...
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Forum: Pi Speakers «»
Posted on: Fri, 06 April 2007 11:34 «»
By: Wayne Parham
Re: Discrete resistors vs. variable L-Pad
Some L-Pads are made to hold their impedance constant, but others are really just potentiometers. The latter will cause crossover characteristics to shift as the slider is moved.
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Forum: Pi Speakers «»
Posted on: Mon, 02 April 2007 08:37 «»
By: Wayne Parham
Re: You've got mail!
If you're asking about the Fostex tweeter and the Beta 12 midwoofer, then yes, I'm sure you'll want to pad the tweeter. I prefer fixed voltage dividers made with discrete resistors, but you could also use a variable L-Pad.
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Forum: Pi Speakers «»
Posted on: Wed, 15 March 2006 08:44 «»
By: Wayne Parham
Re: Question about matching tweet to woof???
I wouldn't drop the sensitivity of the woofer to match. You can do it with a transformer or L-Pad, but I wouldn't. Too much power in the range you're talking about - 90% of the power is under 2.5kHz, hardly any power above. So I'd use a more efficient ...
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Forum: Pi Speakers «»
Posted on: Thu, 02 February 2006 08:52 «»
By: Wayne Parham
Re: SPICE parameters
You can use an L-Pad in the crossover circuit. It's basically a high-power potentiometer. As for measurement of a driver for Spice, you can use an ohmmmeter for DC resistance and a signal generator and a scope for inductance and resonance measurements. ...
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Forum: Pi Speakers «»
Posted on: Fri, 08 April 2005 11:05 «»
By: Wayne Parham
Re: L-Pad Configs
There are several things that resistance in the circuit can be made to do. It can be used to provide attenuation and it can also be used to set the Q of the circuit. So the differences in values and configuration are what set those things. In some case...
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Forum: Pi Speakers «»
Posted on: Tue, 09 March 2004 17:57 «»
By: Wayne Parham
Re: Attenuator/Compensator
As you may have noticed in the π crossover document, I did the design work with Spice, and developed the circuit to provide a specific response curve. This is accomplished by setting the Q of the crossover/voice-coil circuit. It is purpose-designed to ...
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