same model parameters not the same?

[Boboblittz 10+ year member]

Okay so i was curious, whenever i look at subs i look at the specs and i have noticed something with every reputable brand.

For example the most recent sub i looked at was the AA Mayhem. I don't understand why the parameters for the same size same model sub, change based on whether it is 1 2 or 4 ohm etc.

I understand that electrically the impedance is lowered by changing the resistamce of the inductor(coil) but why would, as with the mayhem, the bl of the dual 2 ohm be like 17 tesla meters and the bl on the dual 4 ohm be 25??

I really feel like the guy who wants to wire two of those in a 2 ohm load is getting totally shortchanged.

Click to read more...

 

[T3mpest 10+ year member]

BL is relative based on the resistance of the coil. The correct way to measure BL is BL^2/Re (impedance of the coil).. If you measure a d2 sub wired in series or parallel you'll find the BL value won't be even close to the same, but BL^2/RE will be basically the same.. Long story short, dont' worry about it, the differences in BL aren't that big when using the correct formula and any model can do what you want, just pick the one that works best for your amp.