Why is D unpopular?

[Guillaume Piolat]

On Monday, 2 May 2022 at 17:36:46 UTC, Ola Fosheim Grøstad wrote:
> Or are you talking about side-effects from low pass filters

Yes, in a DSP process, upsampling and downsampling are two 
lowpass filters themselves.

> But regardless, you should be able to use a phase-correcting 
> allpass filter, if desired…?

You can go linear phase yes, but you need to choose between
- introducing latency for all frequencies (linear phase),
- or introducing a phase shift just for the basses (minphase). 
minphase is typically used because more efficient and better 
quality. linphase sounds "metallic".