Originally Posted by meridian506
Won't the brickwall filter in the 96->48 downsampling process also introduce pre-ringing, and so George's test is flawed?
Yes, the downsampling will introduce pre-ringing, unless it is a causal filter (no delay), which is preferable for real-time application. At least the delay will be as minimal as possible, hence reducing the pre-ringing as much as possible.