That is what I was hoping /assuming. I guess my thought was that unless the amp has DSP, like an XTI-4000, that I would not have to make any changes. So all my various PLX, PLX2, and old iron crowns can all be considered "analog" with "instantaneous" electrical response.
On a slightly different tack - if I keep everything the same but change one set of passive subs for another model, should I assume that the new subs will need a new measurement to check for phase? Probably not the right terminology again - but should I assume that a different box will likely have a different group delay and require a new alignment measurement.
If your subs are in a physical different place than the mains (say subs on floor and mains flown) , then I would not worry about any little differences that some amps might have-even an amp with processing).
Because as soon as you move your mic a little bit-your delay time will need to be changed.
Not enough to worry about.
The same thing goes for changing out sub boxes (unless you are going to or from a reflex box to a horn box). With spaced devices, you can only get the delay "correct" in one position. Move that position and the delay changes.
So you simply choose some position that "makes sense" and get it right there, knowing everywhere else will be "incorrect".
It is real easy to get "hung up" on the little things that overall don't make a difference.
You always have to ask yourself "What am I here to do?".