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29 Search Results Found |
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Forum: Pi Speakers «»
Posted on: Sun, 16 November 2003 15:48 «»
By: Wayne Parham
Re: How to connect an L-pad ?
If your L-Pad is made for an 8 ohm load, then put an 8 ohm resistor across your tweeter. If the L-Pad is for 16 ohms, then put a 16 ohm resistor across the tweeter. Piezoelectric tweeters are primarily capacitive, and have fairly high impedance, so you'l...
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Forum: Pi Speakers «»
Posted on: Tue, 11 November 2003 11:40 «»
By: Wayne Parham
16 ohm tweeter crossover values
We've discussed this issue several times before, and I thought maybe there was a specific set of values for a 16 ohm compression driver in the archives. Most 8 ohm tweeters have Re ~ 6 ohms and Le ~ 0.1mH to 0.2mH. Most 16 ohm tweeters are about double...
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Forum: Pi Speakers «»
Posted on: Thu, 30 October 2003 12:19 «»
By: Wayne Parham
Resistance and reactance
The attenuation is shown in the response graphs rendered by Spice.One can easily calculate the attenuation of a voltage divider formed with resistors. Where things become a little bit tricky is when the reactive impedance of the driver and of the crossove...
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Forum: Pi Speakers «»
Posted on: Mon, 11 August 2003 00:55 «»
By: Wayne Parham
1.6kHz with Zobel and L-Pad
I'd go with a ~1.6kHz crossover. For a coaxial arrangement, I might be tempted to use a symmetric crossover. As for the top-octave, it really looks pretty good and so I wouldn't add more energy there. Just use an attenuator to match the Beyma tweeter le...
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Forum: Pi Speakers «»
Posted on: Mon, 24 February 2003 10:49 «»
By: Wayne Parham
A few answers
The π compensation circuit does three things:1. Attenuates the HF section to match the LF section2. Augments the top octave to compensate for rolloff3. Damps the peak at resonanceSo to use a simple L-Pad will accomplish one of these things, but you'l...
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Forum: Pi Speakers «»
Posted on: Thu, 30 January 2003 11:35 «»
By: Wayne Parham
You've got mail!
Making a resistive voltage divider to form an L-Pad isn't very difficult, and I expect you'll find lots of websites that will tell you how to do it. It's simple Ohm's law, and you are trying to solve for two things simultaneously:1. Total series resistan...
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Forum: Pi Speakers «»
Posted on: Mon, 13 January 2003 13:18 «»
By: Wayne Parham
To attenuate the woofer, just use a resistor or L-Pad
If a person wants to attenuate a voice coil driver, then use a resistor network or L-Pad. Usually a Zobel or some kind of impedance compensation is also desirable, so I would suggest combining the function of L-Pad and compensator. Usually, voice coil dr...
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Forum: Pi Speakers «»
Posted on: Mon, 15 July 2002 22:28 «»
By: Wayne Parham
Re: Wayne or anybody: L-pad values
The values R1=50 and R2=12 are for the π crossover, which uses a bypass capacitor across R2. R1 is the "load" for the high-pass filter and R2 is a series attenuator. Capacitor C1 is placed across R2, and is 0.22uF for a 1.6kHz crossover and 0.66uF for...
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Forum: Pi Speakers «»
Posted on: Fri, 07 June 2002 10:52 «»
By: Wayne Parham
Re: Midrange in Pi 7's.
I've used cone midranges both with and without horns, and I find them to be better sounding than compression units - by far - for the lower vocal range. But I would stay away from L-Pads on the woofer. Do not consider this to be an option, since it chang...
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Forum: Pi Speakers «»
Posted on: Wed, 08 May 2002 17:16 «»
By: Wayne Parham
Re: L-Pad Calc
That's cool! Looks like you're really developing this into a great little applet!
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