# Need help finding ( LE ) and x max from drivers?

#### Jeffrey 01

Good evening everyone. I have the Audio Nirvana Classic super 3 driver's. I am able to put all the info on the measurement of the drivers but the ( LE )? How would I got about finding the LE from these driver's?

So second question is ? I have all the measurements of these 3 inch full range drivers but there's no x max listed on the drivers spec. Sheet? How would I go about finding it? E mail the speaker driver company? Cheer's Jeff

#### vinylkid58

I have 2mm xmax listed in my WinISD database. No Le listed.

jeff

#### Jeffrey 01

Okay thanks. Jeff

#### Dave R

I found this spec sheet for the "Classic 3" here:
https://www.commonsenseaudio.com/an3specs.jpg

You could assume that the "Super 3" uses the same v.c. and magnet. My guess is that the Mms is lighter for the Super 3.

Given Re = 6.8 ohms, you can calculate Le at points on the impedance plot.
Note Le is not constant, but varies with frequency.

f = 1 kHz, Z ~ 8.0 ohms, Le(1 kHz) ~ 0.65 mH
f = 5 kHz, Z ~ 12.5 ohms, Le (5 kHz) ~ 0.34 mH
f = 10 kHz, Z ~ 18.2 ohms, Le (10 kHz) ~ 0.26 mH

Probably close enough for government work.

#### Jeffrey 01

Thanks Dave that makes sense. This is all I need for figuring out LE. Jeff

#### Scottmoose

And as a minor note, don't forget that there is no fixed definition for what Xmax actually is, just lots of different ways of generating a number for what is described that way, none of which mean much anyway.

#### Jeffrey 01

I agree 1 hundred percent with you ScottMoose but, the program am using needs the x max or it will not work. Also Le as well. Some programs needs only a few numbers and is very basic. The program I am using is between middle of the road and high end. Thanks again ScottMoose. Cheer's Jeff

#### Scottmoose

What on Earth is it, and why aren't you using something worth using?

Or asking. We don't bite, you know. Well, not often, during the daylight hours...

#### Jeffrey 01

What on Earth is it, and why aren't you using something worth using?

Or asking. We don't bite, you know. Well, not often, during the daylight hours...

Funny. I know you guys don't bite. Also the program am using is a few years old. Maybe I should update and use a current program? I wonder which one? Jeff

#### Scottmoose

Lots of good software. Depends what you're trying to achieve. What are you currently using?