Waveguide effect on speaker efficiency

[catapult]

This effect can be easily accomodated in the crossover if the output impedance is known. Problem is that the value is different for every design. Makes it impossible to do an optimal correction for anything but a specific value and "0" seems like the best choice to me.

About all you can do is flatten the speaker's impedance so the amp's output impedance doesn't change the response. But that can be a real pain -- multiple Zobels on the speaker's input to knock down all the impedance peaks.

 

[gedlee]

I don't flatten the impedance, I just redesign the crossover for a high source impedance. Zobels would be a universal solution, but expensive to impliment, unnecessary for low source impedances and a power loss for everything. It's not a good solution.