Will I benefit from a subwoofer with 20Hz speakers?

"The speaker's published frequency response is 41-20,000Hz. I presume this is achieved in an anechoic chamber. In my room however, it goes down to 20Hz, at least according to the Dirac measurements. In fact, I needed to flatten the curve and  reduce by 5-20 DBs between 20-100Hz due to the room effect."

Nice looking speaker. 

You have a magic room. The speaker defies manufacturers reasonable/real world  low frequency claim? Hmm...

I took a look at the website. This one is over the top:

 

Here is a photo of my measurements (took me forever to figure out how). 😁

They are taken from the listening position. As you can see, I had to even reduce the low frequencies by quite a bit. 

 

 

 

Here is a photo of my measurements...

Well to answer your question. Yes you could live without a sub on that system. You have most everything covered. That is not to say there is not more to get but you would not be missing much. 

 

Thank you for this Erik. I have never used this, so I will spend some time going over it. Here is what came up based on my room size of 16X18X8 feet. https://amcoustics.com/tools/amroc?l=487&w=549&h=244&r60=0.6