[pjchappy]

Thought this was the most suitable Circle for this.  Anyways, I'm about to undertake re-integrating a subwoofer via a digital EQ/crossover.  In the future, I plan on going fully active with a new set of speakers.  This got me thinking. . .

1.  How do you know if a digital EQ does not introduce any phase errors?
2.  If you know the crossover points for a passive speaker and can compensate for baffle step correction, what else do you need to know in order to "copy" the passive crossover via a digital one?


Paul

 

[Ethan Winer]

1. There are two types of digital EQ - minimum phase and linear phase. A minimum phase EQ works exactly the same whether analog or digital. Phase shift is an integral part of the process. Not only integral, but benign and necessary. Minimum phase is the most common type of digital EQ. A linear phase EQ uses trickery to reduce the amount of phase shift, but at the cost of adding pre-ringing artifacts. So for that reason I've never bothered with linear phase EQs.

2. I'm not a crossover expert, but if you use a minimum phase digital crossover it will behave exactly the same as an analog counterpart.

You may also find this useful: Equalizers and Phase Shift

--Ethan

Edit: meant to write minimum phase crossover in 2 above.