Here are some measurements of a priliminary speaker design. You may wish to take a look at what can be done.
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| Transient Perfect 2nd Order Crossover | |||||||||||||||
| I have written two papers on the design of transient perfect second order crossovers. This class of crossovers have symmetric high-pass and low-pass filter sections. The roll off rates are second order. The filters sum to a non-flat, minimum phase response which is then equalized, using a simple passive equalization network which is also a minimum phase network. The final response is flat with no phase shift. Application to real speaker designs is also discussed. The first paper appeared in the May 2001 issue of AudioXpressis available for down load. The second paper present design rules for active circuits and appears in the December 2002 issue of AudioXpress. The Excel spreadsheet is based on those design rules. Here are some measurements of a priliminary speaker design. You may wish to take a look at what can be done. |
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| Download paper (630k zip file) | |||||||||||||||
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| Download Excel spreadsheet | |||||||||||||||
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| The figure to the left is an experimental measurement of the response of a breadboarded 1 K Hz version of the crossover discussed in the paper. The figure shows the input 500 Hz square wave, the outputs of the HP and LP filter sections, and the summed response. This crossover was not critically tuned. Parts bin parts with 5% tolerances were used. Component values were the closest standard values. | |||||||||||||||