Wombat wrote: 
> So they obviously use a slow roll-off together with minimum phase. 

In terms of modern trends and fashions, I agree that minimum phase and
slow roll offs come together, 

but if I remember what I learned in filter design class, not so much.

For example any Butterworth filter is minimum phase, and all it takes is
a fairly high order of Butterworth filter and a 20 KHz (-3) filter to
provide a 100 dB stop band at the 44.1 KHz Nyquist frequency.

There is a matter of practiality, except that minimum phase digital
filters are completely possible.


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