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3-Way Optimized Passive Audio Crossover with Imported Transducer SPL and Impedance

Precision audio crossovers can be easily designed, both for analog passive/active or digital. In this example the measured SPL response for each of the three transducers in the prototype enclosure were imported into the program, and loaded into the three Voltage Generators.

Likewise, the complex Impedance curves for each transducer were imported and loaded into the three Z components, representing the actual network loads. Two Buffer components (T=130uS & T=450uS) were added after the woofer and midrange generators, to model the true time locations of the transducers. A Summer component is used at the three outputs to sum the complex signals into the system response.

The networks for all three sections were then designed and optimized to 4th order Butterworth-6dB targets, and then the final combined response again optimized for smoother crossover regions. All of the Inductors include losses for parasitic resistance and capacitance.

 
 

In this graph the output response for each section (lowered 20dB) is shown. Blue-Woofer, Green- Midrange, and Red-Tweeter.

The Black curve is the total system response with all sections in-phase, and the Purple curve shows the system response with the Midrange summed out-of-phase.

 
 

This graph shows the magnitude and phase of the total system impedance. FilterShop does not produce impedance curves directly, but by using the generator as a current source the generator voltage becomes proportional to the impedance.

 

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