Calculating Impedance of "Multi-way" Speakers. - Overclock.net

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post #1 of 9 Old 09-16-2013, 03:26 PM - Thread Starter
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How does one calculate the impedance of a two way speaker properly, or 3 way, 4 way etc?

I need this information because I want to create a simple first order high pass filter for two "midranges" and I would like to have correct resistance and capacitance values for my crossover components.
Say for example that the drivers that I am using are 4 ohm, 8 ohm and 8 ohm.

Two opposing things can create all things when working together.

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post #2 of 9 Old 09-16-2013, 07:22 PM
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While a simple resistor/capacitor crossover will work (been there/done that), for just a little more money you can build something that will sound good.
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...and enough power to shoot the speaker cones through the walls.

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post #3 of 9 Old 09-17-2013, 04:09 PM - Thread Starter
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Quote:
Originally Posted by billbartuska View Post



for just a little more money you can build something that will sound good.

I didn't know It was a simple as adding or finding the average. biggrin.gif
What did you have in mind for something better?

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post #4 of 9 Old 09-18-2013, 06:34 AM
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The possibilities are pretty much endless.

What SQ do you require, what functionality so you require, and $$$?

Ohms Law

This

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...and enough power to shoot the speaker cones through the walls.

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post #5 of 9 Old 09-18-2013, 08:38 AM - Thread Starter
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Well, to be honest this is more of a cheaper SPL project.
I'm building this simple 3 way speaker to replace my sisters horrid 2.0 "system" as she calls it. So it wont be too hard to accomplish.
I was only thinking of a 12db/oct Filter to keep it a little more efficient than 6db/oct
My project budget is just about 200 dollars.

I will likely use a 6.5 In 4oHm Drive for the lower end:
This - not likely
This
Or this

and Two 3 inch 8 Ohm drivers that I already have, most likely in parallel.
In a ported enclosure that will look rather silly. When I get home I will have pictures of my "sketch"
Keeping it frugal biggrin.gif

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post #6 of 9 Old 09-18-2013, 06:24 PM - Thread Starter
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An array of a not so sq enclosure...

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post #7 of 9 Old 09-18-2013, 07:44 PM
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cool!

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...and enough power to shoot the speaker cones through the walls.

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post #8 of 9 Old 09-19-2013, 09:56 AM
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If you're going to DIY the amplifier, I would bite the bullet and go bi-amp. You get a ton more power that way, and less crossover distortion.

One of these days, I'm going to do that...

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post #9 of 9 Old 09-22-2013, 01:38 AM
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Quote:
Originally Posted by billbartuska View Post



While a simple resistor/capacitor crossover will work (been there/done that), for just a little more money you can build something that will sound good.
Is that correct? I've learned a different formula for resistors in parallel - I'm trying to work out why it wouldn't apply to a speaker. 4 + 8 = 2.66 Ohm at the amp?
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