Bob McCarthy talks about understanding phase. Using a series of easy to understand diagrams Bob teaches how to read phase responses.

An excellent video by Monty Montgomery @ xiph.org, clearing up some very common misconceptions about digital audio.

filter modelling with Smaart v.7For those who are interested in filters, specifically crossover filters, there's a way to visualize filter behavior and interaction (both amplitude and phase) with nothing but your Apple computer and Smaart v.7.