crossovers and ohm’s

when using a passive crossover like a 3-way , how does it affect the Ohm's an amp will see? or HU? can You mix 2-4-6-8 Ohm speakers with the crossover and the amp "see" just X ohms no matter what? What about an active one? Haven't been able to find anything about this subject here?

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chrisbean wrote:

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when using a passive crossover like a 3-way , how does it affect the Ohm's an amp will see? or HU? can You mix 2-4-6-8 Ohm speakers with the crossover and the amp "see" just X ohms no matter what? What about an active one? Haven't been able to find anything about this subject here?

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As I understand it; and someone please correct me if I am off base here, I believe that you could design a passive crossover to present any load to the amp you needed to, or you could probably do it to where it doesn't change the load at all(just the sum of the drivers in the network in paralell).

I wouldn't think an active crossover would change the impedance at all...

The amplifier will "see" whatever the impedance is at whatever frequency you are referencing.

If you have a 4 ohm woofer, and it's crossover point is, let's say, 500Hz, at every frequency BELOW 500Hz, the amplifier will see 4 ohms. You CAN mix impedances on the output side of a crossover, but the crossover MUST BE BUILT for such a purpose. If you choose a 4 ohm woofer, a 6 ohm mid, and an 8 ohm tweeter, you must address the woofer's low-pass section as a 4 ohm section, the mid's band-pass section as a 6 ohm section, and the tweeter's high-pass section as an 8 ohm section.

Active requires no such compensation, as the amplifier is directly attached to a SINGLE DRIVER, and all the amplifier sees is the load attached to it. There is no filtering between the driver and the amplifier outputs.

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

I was thinking more inline of buying a componet set of speakers with a crossover included in the set. Or maybe buying a 2 or 3 way crossover and working with them.

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If you are buying an off the shelf set, your worries are unfounded. Connect the drivers provided through the crossover provided, and don't worry about it. They are already impedance compensated, and designed for the drivers, whatever their impedance.

Oh, and you MIGHT consider re-sizing that gif in your signature. That's a little bit big, don't ya think?

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

I want to put together a decent system.Not to expensive ...not to cheap. But the more I get into it the more I miss the old days when I was young and it didn't matter what you had as long as is worked and was loud LOL!

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If that's the case, you'll not find a crossover that you can buy, and then connect whatever speakers you want... You'll be building the system from the ground up, once you choose your desired speaker complement.

Once you have settled on drivers, (and get whatever drivers YOU like, don't worry about the impedance - the impedance can be allowed for in the "final draft".) THEN you build the crossover as I described in my first post to you.

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

That's kinda what I figured on. I've seen some posts about building crossovers and such. Gonna give them a GOOD read!! Thanks for all the Way fast answers! And Is this sig better? lol - it is smaller. Now to chase down my wires to my amp....REALLY need some help on that!! Nut thanks again!

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