OK, here's the phase adjusted to 180 degrees (originally at 0):
phase 180 3 april.jpg
Here's the original 0 degree phase graph:
filters (25 40 50 80) mains + sub.jpg
So, this is much better overall. It shifted the dip to 72Hz, and softened it some--looks like some of the other FQ were also positively affected!!!
Wonderful! That's moving in the right direction.
Sadly my AVR doesn't have a sub distance setting! Nada, zip, zilch...
Question: Just for complete clarity, I don't have to do anything other than plugging in the L channel and turning on my mains to test this, right?
I'll experiment with some other phase settings, and possibly try a little sub movement--I'm limited in what I can do that direction...
BTW, Ken (I'm sorry I've been calling your Bruce
) would you advise a small boost of that 72Hz? If so, how much would you guess at what bandwidth, etc.?
-- Phil