Question about inductors

[Luke]

Hello

I've seen something unusual and ask for explanation.
Scroll down and at right, take a look at the crossover in bottom part of this Ohm speaker.
There are two identical stacked air cored inductors.
Here is the picture :

https://www.google.ca/search?q=Ohm+Walsh+2000&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiX6YvL47PyAhWOneAKHcHPDLAQ_AUoAnoECAEQBA&biw=924&bih=487#imgrc=VEkXq4BqnBNemM

Why is this? how does it works? What happens with inductors values?
And above all what are the compromises if any?
Thanks!

Luke

[chrisn]

The link doesn't go to any specific image when I click on it. If i were to guess on the reasoning: They didn't know it was an issue, they didn't care it was an issue, or they did it to get away with a smaller inductor value, presuming the value increases due to proximity of the other coil, for a small cost saving.

[Reet]

For audio frequencies you can expect that stacking inductors to have no benefit over a single larger inductor. For commercial speakers the selection is most likely cost related, so that the manufacturer can order a higher volume of a single part value to reduce costs.

There is "sectional inductors" which have separated windings to reduce parasitic capacitance, but these are generally for RF and PWM application, not for audio frequencies.

[Luke]

Thanks guys.
Luke