[Wayne A. Pflughaupt]

Okay, so basically phase shift and modal ringing are the same thing. So in essence what the Rane man is saying here...

In fact, it can be argued that phase shift is the stuff that causes amplitude changes. Amplitude, phase and time are all inextricably mixed by the physics of sound. One does not exist without the others.

...is that change in modal ringing (phase) from an equalizer is no big deal. I agree.

atledreier wrote:

That seems to somewhat contradict your general advice to use broad filters, Wayne. I use your advice with good results, but whatever works..

I get the impression he’s mainly talking theory more than practical application, because...

Only by adding many precise, narrow phase shift and amplitude corrections do you truly start equalizing a system's blurred phase response.

...for one, I don’t know of anyone who makes an equalizer like that – i.e., allows for numerous highly-precise filters.

Second, I assume he would know that it would be impossible to achieve this for every location in a room.

Third, from what I understand, room modes as we know them in our little rooms are not a significant problem in the large rooms you typically see in Rane’s world.

Regards,
Wayne