Will I benefit from a subwoofer with 20Hz speakers?

@bishop148 The point is not more bass! The point is to get the bass right. If the bass is deficient, the ear will perceive the system as being tilted to the highs; if there is too much bass the ear will perceive the system as being muffled in the highs.

 What you say is true, however if you were use a low cutoff filter at 40Hz. With most music I doubt if you could hear the difference. A subsonic filter cuts in about 40 Hz and I could never tell the difference apart from stopping the excess movement of the bass speaker.

@erik_squires Again, if you do a life music recording out of the 40Hz-20kHz speakers and the flat 20Hz-20kHz treated room, your claim will be much more convincing.  Post it on Youtube and you will be famous.  Why not?  Your audiences should not be limited to audiogoners.

@lanx0003 - The day you pay me to do this is the day you get to complain of what I have or have not done. I ignored you because I have other things to do, and other priorities in my system, which will continue to be true.

Since I make no money either way based on whether or not audiophiles take my advice or not, make of my postings what you will.

If you think I am in error I suggest you post your own findings, and actually do something instead of complaining that I haven’t done enough for you, because the level of obligation I have to you or anyone else on this site is ZERO and I'll be damned if you or anyone else on this site gets the impression you have any say so in how I spend my precious free time.  

@atmaspher Yuo tell us acoustics is simple. Put two small swarm subs in the room and your ears won’t hear any peaks or dips. Well, to me it isn’t.

@erik_squires You owe nothing to anyone or me. Your voluntarily service to the audiogoner in the community is beneficial as I have complimented previously. However, when you make such a strong/powerful claim and try to maintain the credentials when others challenge, the burden of proof is on you. It is a reasonable doubt that what you have measured is one thing but what is actually heard is another. It is your decision to do what I have suggested, which is another way to disprove something that I and a circle of friends of mine don’t believe achievable. We all do not believe will be so "lucky" as you are...

Oh, BTW, last time your advise toeing speaking in front of MLP and I reply with the shrinkage of SS as a result, you ignore too.  Is it another way of yours admiting something you have advised is wrong?  Ignore again.  I don't care but just wish get some mindful message across so others will not follow the wrong footstep.