gswitz

Chregg
naturally all anti aliasing filters aren't gonna be created equal
 

https://www.youtube.com/watch?v=qdfWWg1FOyQ
 
Some appear to not be in place at all.

You need at a minimum a 6 pole anti-aliasing and band limiting filter in your audio interface designed to minimize phase distortion. There is little data on filter implementations across commercial audio interfaces as well as the phase distortion in the implementation since most of the design info is proprietary. IMHO the more expensive professional line equipment has better implementation of ant-aliasing and band limiting filters and also more stable clocking signals which reduce jitter. Maybe as marketing runs out of sound bites and consumers becomes more educated filter design and clocking stability may come into focus and we will see more manufactures touting the specifications of their filters and stability of their clocking signals.