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FIR Crossover Filter Design - ECLIPSE AUDIO
https://eclipseaudio.com/crossover-filter-design/
Designing FIR Filters with Crossovers for a 2-way Loudspeaker The resulting FIR filters include the crossover responses and linearise the loudspeaker phase everywhere except at the loudspeaker’s low frequency roll-off. Measurements for this example can be downloaded below, and are taken from a 5″ coaxial loudspeaker.
Application Note 7 Digital Audio FIR Crossover App Note ...
https://www.swupload.com/data/Digital-Audio-FIR-Crossover.pdf
Application Note 7 Digital Audio FIR Crossover The analog filter and Ft = 425Hz FIR filter are shown below. The knees of both are very similar, while the attenuation rate is much steeper in the FIR case. We could have probably gotten by with less attenuation if we needed a lower order.
FIR Crossover Design: FIR Designer ... - ECLIPSE AUDIO
https://eclipseaudio.com/2018/01/07/complementary-crossover-filters-in-fir-designer/
For a perfectly flat summed response, FIR Designer can calculate a COMPLEMENTARY HP (or LP) filter from the chosen LP (or HP) filter, when set to linear-phase. The filter pair can be used for targets in multi-way designs, providing more crossover options. Works for Bessel, Butterworth, Chebyshev I & II & Elliptic filter prototypes.
FIR Filter for Audio Practitioners - HX Audio Lab
http://www.hxaudiolab.com/uploads/2/5/5/3/25532092/fir_filter_for_audio_practitioners.pdf
An example of a passive crossover typically found in a loudspeaker is shown in figure 1. The IIR filter is common and can be used in the passive/analog domain and in a digital signal processor (DSP). Several common terms that relate to IIR (some relate to FIR too) are: passive/analog crossover, minimum phase filter, analog graphic/parametric EQ.
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