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Linear Phase Crossover Filters Advantages in Concert Sound Reinforcement Systems: a practical approach
Today concert sound reinforcement systems constantly demand for improved performances. The crossover approach could be a key point to improve the overall speaker performances and modern DSP offers several chances to do that. FIR Linear Phase Filters, one of the processing that strictly belongs to digital domain, could be one of the most useful. FIR Linear Phase Crossover technique, even though is well know and have been largely studied from a while, for some practical reasons is still not quite largely applied at the moment. Anyway, better system transient response together with increased dept and warmth can be obtained with this method even though some limitations need to be considered. The results of practical application of existing DSP based device to several real world loudspeaker systems will be shown together with the achievable advantages: overall time and phase response improvements, polar response stability improvements, general output capability increasing if very steep brick-wall functions are used. Issues and limitations that could arise attempting to set a loudspeaker crossover with Linear Phase Filters will be analyzed and shown as well. In order to compare the results, several loudspeaker systems have been processed and analyzed using both FIR Linear Phase and Standard crossover techniques. The results will be shown and demonstrated with the large support of real measurements results.
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