The "philosophy" NPS would require an infinite number of ways, each connected to the cluster of speakers of different geometry.
addition to the problems of cost, complexity, et c., there are actually several practical limitations.
First of all, above 5 KHz wavelengths are hardly "representative", however, with transducers that have dimensions several centimeters.
Secondly, at low frequencies, the wavelengths become enormous, but not insignificant in terms of NPS (it is very difficult to "locate" a source at these frequencies).
is also good practice to make the streets so as to cover at least two octaves, this is to simplify the management of the crossings, both to try to limit the emission of harmonics of the same key from different transducers (a problem also inherent to the diffuser multi-way).
Taking this into account, the maximum would produce a five-way with the following frequencies: 80, 320, 1k25, 5k, corresponding to the wavelength "core" of 8.5 m, 2.1, 0.51 , 0.13, 0034. With
frequencies so close you should definitely play a bit with the cutting slopes.
One possibility would be to adopt a Rane AC 23B, which allows five-way mono, and various slopes.
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