Will I benefit from a subwoofer with 20Hz speakers?

@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.

It depends.  Have you measured your respone with pink noise at the listening position? 

Subs have flexible placement and may be able to boost the low end and fill some holes in the bass if needed.  

If your response is smooth then I would not add subwoofers.  It takes a lot of work to get them to sound perfectly integrated.  

You have more than enough amp power to give your speakers a full range sound.  

A great full range speaker is the best way to go for me. 

@erik_squires ,

You have responded well to the OP's original concerns, and I for one appreciated the dialog.  You've not only laid out a reasoned approach for assessing one's existing setup, but documented some very economical tools for doing so.  

It makes perfect sense in these cases to collect more data and learn more about your system/room before laying out $4K or so in subs.  I for one would definitely go this route.

The notion that you failed to make your case - for questioning the accuracy of published speaker ranges without also considering room effects, - is ludicrous.

You gave some good examples, including specific comments on OPs speakers. 

Even Hans Wetzel's review of the Cabasse Pacific 3 mentioned by @dmilev73  - but apparently not read by the skeptics, alluded to the same point:

"The speaker’s claimed 41Hz lower limit must be an anechoic measurement; with room gain, I’d be shocked if they didn’t have solid output down into the low 30Hz range, possibly even the high 20s."

Please keep the great comments and ideas coming!

Sandstone