why exactly does impedance change?

[Flipx99 5,000+ posts]

That is what is problematic about teh forums.

Here, oftentimes the questions are too simple, and on DIYMA/ECA/etc, they are way way over my head....slowly, but surely we learn

 

[Flipx99 5,000+ posts]

How come they don't use this klippel testing in SPL apps so they know what tone to use? Or how they can better model the box to work with the vehicle?