[David Gravereaux]

On 07/27/2012 06:23 PM, wrote:
You'll need a bunch like a graphic EQ


Phase is purely time-related.

If by time, you mean (1 / freq * 4), then yes.

90 phase shift at 20kHz is 12.5uS whereas a 90 shift at 20Hz is 12.5mS.
Now image that doing full bandwidth. Time is not constant, the phase
shift is. Each band will have the slope of its all-pass match for 90
over its coverage. How well you can keep the slope (shift) constant
over a range will determine how many bands you'll need.

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