# What is SPL high and low impedance VituixCAD

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#### FriedMule

I am trying to start on learning to build speakers and have chosen VituixCAD.
It ask me to fill out the drivers high and low impedance, what does that mean?

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#### rayma

Look for the driver's impedance curve in the mfr data, not the frequency response curve.

#### FriedMule

Look for the driver's impedance curve in the mfr data, not the frequency response curve.
Thanks! All I have is this:

EDIT: I am assuming that RE impedance is the value you normally give a speaker, like 4 Ohm 8 Ohm and that kind?

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#### rayma

What is the driver brand and model number? This says you can model it as a 6.5 ohm resistor,
so do that. High impedance = low impedance = 6.5 ohms.

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Ok, good luck.

#### FriedMule

Ok, good luck.
Thank you
But I can understand that if I find a mfr graph, I do get the missing values for the low and high impedance?

#### rayma

I do get the missing values for the low and high impedance?

See post #4.

#### FriedMule

See post #4.
Thanks a lot and I am sorry for not seeing that reply!
I just found this graph, but with no explanation:

#### rayma

I just found this graph, but with no explanation

That's the magnitude of the impedance (bottom red curve, left scale),
and the phase of the impedance (top green curve, right scale).

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#### FriedMule

That's the magnitude of the impedance (bottom red curve, left scale),
and the phase of the impedance (top green curve, right scale).
Thanks a lot!!
But do I read the impedance right, it looks like 8-10 Ohm but as you correctly stated, it says 6.5 +-5 on the text?

#### rayma

Thanks a lot!!
But do I read the impedance right, it looks like 8-10 Ohm but as you correctly stated, it says 6.5 +-5 on the text?

Each scale division is 0.5 ohm, so it actually is 6.5 ohms.

#### bogdan_borko

For what purpose you're going to use the driver with such a bad freq. response?

#### FriedMule

Each scale division is 0.5 ohm, so it is 6.5 ohms.
Many thanks!!
I do know that i may not show it, but your help do mean a lot to me, I am so grateful, thanks for all your help. I also know that I may seem like I don't read half of it, but I try, it's just that English is self thought and electronic is a new wonderful universe where I do know nearly nothing!

#### rayma

For what purpose you're going to use the driver with such a bad freq. response?

It fills in the LF on a baffle, that's the free air response. It's less than 5" wide,
so the free air response drops off below 2kHz.

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#### FriedMule

It fills in the LF on a baffle. That's the free air response.
I heard them on some speakers a long time ago and PS audio has just build some amazing sounding one and as I understand are they farly easy to mount in a cabinet, demands nearly nothing. On top of that did I just chose them to play with on the speaker simulator.

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#### FriedMule

What's your native language? English takes kids here years to learn, but we grow up with it.
Can you find electronics books in your native language? Here's a good one in English.
https://www.pearl-hifi.com/06_Lit_A...pers/Horowitz-Hill/The_Art_of_Electronics.pdf
I am so lucky that I do understand English speak fairly good but I takes some more to read it. And my grammar is so bad I wonder how anyone do understand what I am writing.
There are book in Danish but to be fair, I do not think you can find much newer then 1980 and since YouTube, Fora, Datasheets and so on is in English, do I try to learn it all in English.
Thanks for the link! I do often let the computer read out loud if I want to learn from longer texts!

#### rayma

I do often let the computer read out loud if I want to learn from longer texts!

Good luck, I imagine learning English using technical material is about the hardest way to do it.

#### FriedMule

Here is my first try on "taming" the driver

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