Why do you use a 12 dB/oct crossover between woofer and midrange when the crossover to the tweeter is at 24 dB/oct?

A19 - The crossover to the tweeter is at a steep slope to prevent lower frequency signals from pushing the dome into large excursions. For constant SPL the dome excursion increases at 12 dB/oct as you go down in frequency. Thus, a 12 dB/oct crossover would merely keep the tweeter's low frequency excursions constant, not reduce them.

Since program material usually has larger low frequency than high frequency amplitudes, this could lead to inter-modulation distortion in the driver. In my work on crossovers (Ref. 17) I observed that the phase distortion, i.e.

The all-pass behavior, of the 24 dB/oct crossover has no audible side effects in this frequency range. See Design Models F. I also noticed then that the very low frequency part of the spectrum is audibly affected by the system's phase response (further observations in: L.

R. Fincham, "The subjective importance of uniform group delay at low frequencies", JAES, Vol. 33, No.

6, p. 436, 1985). This is the reason for keeping the dc ... more.

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