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Formula for getting Le of a sub

 

Silver Member
Username: Frkkevin

Lake Worth, Texas US

Post Number: 497
Registered: Nov-05
Just wondering which two parameters you use to get the Le of a sub? Unless someone knows off hand the Le of a RE SX 15?
 

Bronze Member
Username: Bobimpact

Danbury, CT US

Post Number: 41
Registered: May-06
Why do you need the Le of a sub? And do you need Le at Fs? 1k?

If you can get ahold of the Kxm and Exm figures, the formula is:
Le(Voice Coil Inductance in mH) = Kxm * ω^(Exm - 1)

Where:
Kxm = Constant Reactive Motor Impedance
and
Exm = Exponent Reactive Motor Impedance

It may actually be easier to buy the sub and measure it.
 

Bronze Member
Username: Bobimpact

Danbury, CT US

Post Number: 42
Registered: May-06
Argh, that's Le = Kxm * OMEGA ^ (Exm - 1)
 

Silver Member
Username: Frkkevin

Lake Worth, Texas US

Post Number: 516
Registered: Nov-05
Well it was the only factor in bbp6 I could not input but it turned out I did not need much. You seem to have a very well knowledge of audio.. where have you been all this time lol. Trying to build a new box for my SX that won't belly flop like the old one. Running my street beater (35hz) and it does 145.7 on a tl.. Going to build an all out comp box but I need to find the resonant frequency of my car. Wish someone knew anything about VW Jettas on here.. Trying to break a 150 with a single 15" in a trunk car.. Not likely going to happen but its possible ..
 

Gold Member
Username: Bestmankind

Los Angeles, CA USA

Post Number: 5071
Registered: Oct-05
i think his glasswolf with a new name.
 

Silver Member
Username: Frkkevin

Lake Worth, Texas US

Post Number: 517
Registered: Nov-05
i saw glasswolf recently posting in the amp section though.. but if it is.. bought time your back lol
 

Gold Member
Username: Bestmankind

Los Angeles, CA USA

Post Number: 5072
Registered: Oct-05
i was just messing around kevin. lol.
 

Silver Member
Username: Frkkevin

Lake Worth, Texas US

Post Number: 519
Registered: Nov-05
don't do that too me.. just got off work and im half asleep waiting for a frozen pizza to cook! .... already worked 40 hours this week and i still have tomorrow to go.. 58 last week with only one day off which i spent all day working on my car audio.. oh well .. 3 day week end whoo whoo! lol
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