Jwo Shong's Car Audio


Part 5 - Electronic Crossover Selection

Step 14 - At that time I have a "true" 3-way electronic-cross-over, The specification meets our requirement and so is used. It is AlphaSonik EX-3B from 1990s. It has a stereo input with 3 stereo outputs, one high-pass for tweeter, one band-pass for mid-range and finally one low-pass for woofer.

The most important criteria is that the mid-range filter's output must be band-pass and not a simply low-pass or high-pass. This is what I call "true". Those without a band-pass output are not meant for this application.

Electronic-cross-over is used instead of passive filters because the cut-off frequency is selectable, while passive is fixed once made.

The low-pass is 24dB/oct, mid-range band-pass is 12dB/oct band-pass and high-pass is 12dB/oct. The mid-range band-pass's low-pass frequency selection is embedded with the high-pass frequency and not separate.

If all were 24dB/oct, that would be even better.

Step 15 - The filter's responses are (simulation / theoretical): -

Step 16 - and their combine signal is

Here we notice the bass is weaker, that's because I simulated it with a lower signal. But the mid and high is fighting and therefore is put on suspect for further practical application investigation.


  1. Jwo Shong's Car Audio

  2. Tweeter Selection

  3. Mid-range Selection

  4. Woofer Selection

  5. Export LMS & Import into LEAP

  6. Electronic Crossover Selection

  7. Audio Crossovers' Simulation

  8. Audio Crossovers' Error

  9. Audio Crossovers' Optimization

  10. Reality Bites

  11. Finale



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