Sorry for the delay, I have time and inspiration to write in spurts it seems.
In that rambling post I was trying to say that since they are home made speakers, it would be good to determine if they are behaving first, by removing the room and measuring them and to be sure to use the right kind of microphone (especially since it is a bass issue).
Also, to say that in a living room, an RTA is not sufficient resolution to separate a cancellation notch which can never be fixed with eq (being a time problem and trying to fix it is often harmful to the sound quality) from a broader dip or peak which can be fixed.
If one can have multiple lf sources, this would seem to be a good way of defeating specific room modes but the woofers I get to play with are too large to have very many in a living room at one time.
Cheers,

Tom Danley

"All associated factors are relevent. SO even higher frequencies can influence the perception of LF's."

Absolutely true.

A fellow from Zenith TV once told me once that focus group testing showed that good sound makes the picture better too, perception is a complicated thing.