Will a subwoofer help?

Will a small subwoofer help my stereo?

Energy rc-70’s , they have a rolled off tweeter, so they are a warm speaker already.
Will even a small 10” help take some of the low freq from my speakers, and sound better, my main room is large, with 18-19” vaulted ceilings.

Would a small sub even do anything, as the speakers sound good as it is, but may be too small for the room.
The room fills with sound no prob,just curious if a small sub would help boost the vol, and take some of the work load off of the small bass bribers.i think their 5.5” drivers, or 6”
Energy rc-70’s

Thanks

 

They go fairly low to begin with, 31hz +/- 3db. You could always get a SVS SB 2000 which goes down to 19 hz. It would add a little bit of more "presence" to the music.