Do me a favor, and don't be a ****...I'm really trying to understand this, and need for you to give some leadway here. If you don't want to contribute to the thread constructively, please don't; I understand you have an "insanity defense" to your "TLS" hobby, or whatever it is, but that doesn't mean the rest of us do not have "entry level" questions about setups.
It's clear you have a very advanced knowledge of electronics, inner workings of equipment, engineering and any and all elements inbetween -- but please don't make comments as you just did. Calling someone "stupid" that you don't even know does not really constitute sane judgement on your part.
I'm far from "stupid"...I have some questions about the workings of the subwoofer and its interacting gear in the chain.
Sorry, but we have had some very frustrating posts of late.
Let's have one more go.
The AVR stats rolling of at 80 Hz say, typical.
Now no filter is a brick wall. Usually the order of receiver crossovers is not quoted, which they should be. However at the set turnover frequency they will be 3 db down (half power) and then roll off either 18 db or 24 db per octave. So by 160 Hz the power in that band is negligible.
Now if you set the sub crossover close or below the receiver crossover, both filters are operative, which is generally not what you want.
So if the receiver is to be the low pass filter, then the sub has to be set as high as possible, so the two low pass filters do not cascade.
That is about as simple as I can make it. There is a minimal fount of knowledge required before you can understand technical issues.
Unfortunately I fear our educational system has failed. There is an article on the editorial page of the Minneapolis Tribune today, bemoaning the fact that people are now graduating without minimal skills in applied logic and reasoning.
This makes large numbers of people useless to employers in this increasingly technical age, and the problem is getting worse rapidly.
It is obviously in your case impairing your pursuit of a fascinating and highly rewarding hobby.
Unfortunately the issues surrounding this issue are extremely elementary.
I can see from these forums of late, that the author of today's op ed piece is correct unfortunately.