impedence with self made crossover

trespasser_guy · 18th September 2002, 10:01 PM

If I used multiple drivers, like in a 3-way design, using a woofer and two phenolic compression drivers for mid/tweet, and hooked them to a crossover that I made, what impedence would I have if each driver is 8-ohms? I know if you average it out, like if they were all linked directly, you would have about 2 2/3 ohms... does hooking them up to any crossover make that impedence 8-ohm always? How is it determined? What must I add to make it 8-ohm? What about 4-ohm?

cyclotronguy · 18th September 2002, 11:09 PM

Impedance is a frequency related issue, you are best served by running a program like SPICE and generating a curve of frequency vs impedance.

The short answer is "there is no short answer!"

Cyclotronguy

jackinnj · 19th September 2002, 12:39 AM

The crossover will present a low impedance for the passband for which it is designed, and a high impedance for the out-of-passband frequencies. It does the summing by itself.

Not to be a smart-aleck, but pick up a copy of the ARRL Handbook in virtually any library in the US and they go through the physics of why this works in terms which we can all understand.

18th September 2002, 10:01 PM	#1
trespasser_guy diyAudio Member Join Date: Aug 2002 Location: USA	impedence with self made crossover If I used multiple drivers, like in a 3-way design, using a woofer and two phenolic compression drivers for mid/tweet, and hooked them to a crossover that I made, what impedence would I have if each driver is 8-ohms? I know if you average it out, like if they were all linked directly, you would have about 2 2/3 ohms... does hooking them up to any crossover make that impedence 8-ohm always? How is it determined? What must I add to make it 8-ohm? What about 4-ohm?

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18th September 2002, 11:09 PM	#2
cyclotronguy diyAudio Member Join Date: Sep 2001 Location: Northern California	Impedance is a frequency related issue, you are best served by running a program like SPICE and generating a curve of frequency vs impedance. The short answer is "there is no short answer!" Cyclotronguy

19th September 2002, 12:39 AM	#3
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	The crossover will present a low impedance for the passband for which it is designed, and a high impedance for the out-of-passband frequencies. It does the summing by itself. Not to be a smart-aleck, but pick up a copy of the ARRL Handbook in virtually any library in the US and they go through the physics of why this works in terms which we can all understand.