Parallel or series wiring when building new speakers - AVS Forum
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post #1 of 4 Old 07-04-2013, 08:20 AM - Thread Starter
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I have a 4 ohm crossover that will send lows to a woofer, and highs to 2 full range speakers. Currently I have 2, 4 ohm fullranges which I will wire in series, bringing the resistance to 8 ohms while coming out of the crossover, and 1, 8 ohm woofer. Is a 8 ohm crossover acceptable for this, and would the load on the receiver be 8 ohms? Or should I use a 4 ohm crossover, with 2, 8 ohm fulls wired in parallel, bringing the resistance to 4 ohms, and a 4 ohm woofer. Would the resistance at the receiver then be 4 ohms also?

Thanks for your help

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post #2 of 4 Old 07-04-2013, 08:46 AM
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It's not that simple. For starters, I would not use 2 full range drivers to cover the treble. Even if the woofer is more sensitive, that is ok. Don't use 2.

But the biggest mistake is using just some random cross over. Thankfully it's hard to screw up a full range + woofer combination. But still. It shouldn't be done.

Impedance varies with frequency, so there's no way to know what load your amp will see. You need to know the whole impedance plot to make decisions on how your amp will handle it. For instance, suppose a speakers is 8 ohms everywhere except there's a dip down to 3ohms at 200hz. I'd say that's a difficult load to drive and a demanding frequency. If it was 8ohms everywhere and dipped down to 2ohms at 20khz, I'd say no big deal. How much demand is there at 20khz.
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post #3 of 4 Old 07-04-2013, 08:49 AM - Thread Starter
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10 ohms for the full range, but I'm also looking at just doing a normal 3-way system, with the woofer, 1 fullrange, and a tweeter. Would that be better do you think?

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post #4 of 4 Old 07-04-2013, 08:53 AM - Thread Starter
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The graphs for the 3-way system I'm looking at are here.

http://www.parts-express.com/pdf/295-310s.pdf

http://www.parts-express.com/pdf/295-380s.pdf

http://www.parts-express.com/pdf/275-070s.pdf


Here is the crossover

http://www.parts-express.com/pe/pshowdetl.cfm?&Partnumber=260-210&scqty=2



This is my second pair of speakers I'm building, but my first time I'll be incorporating a crossover, so I'm somewhat new to finding a good match.

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