How does the crossover in a component system turn two 4 ohm speakers intoone4ohm load

[deeweld99]

Just want to know how it works. I was confused when I was looking at component speakers when I noticed that the woofer was four ohms and the tweeter was four ohms, but when hooked up to the crossover and then to the amp that the final load was a four ohm load. How does that work?? I know that with subs it would have come out to a two ohm or 8 ohm depending on wiring, but how does this scenario make the final load 4 ohms? And if you can do that with regular speakers, can you do it with sub woofers. Like lets say you have two dual 4 ohm subs. I know you can wire them together for either 4 ohm or 1 ohm final impedance. So if you knew how the crossover in a component system worked could you then possibly wire two dual four ohm subs to be a 2 ohm load??

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[swx1042 10+ year member]

Its my understanding that its 4ohm at different bandwidths.

i.e. rather than a single driver seeing a full range at 4ohms, the cross over will split the bandwidth between two different drivers.

Driver one: 100hz - 3000hz

Driver two: 3000hz - 20,000hz

don't take my word for it though, i'm not certain,

thats just my understanding of it...

 

[scoob8000 10+ year member]

I believe the crossover is changing the impedance.

Try disconnecting the crossover from the speakers and put your multimeter on the input leads with it set to Ohms.

I could also be way off though. But I do know crossovers are specific to the impedance of the speakers. (Ie, a 8ohm crossover won't work properly with 4 ohm speakers)

Maybe one of the electrical gurus can chime in here? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Gebrochen 10+ year member]

Its my understanding that its 4ohm at different bandwidths.
i.e. rather than a single driver seeing a full range at 4ohms, the cross over will split the bandwidth between two different drivers.

That's the way I've always understood it

... and Scoob is right about not mixing ohms. If it's made for 4 and you put 2 ohms on it, the crossover point will change dramatically.