I use to run a sub and Yamaha satellites, I had that sub pretty much invisible. With the sub off the lower frequencies were gone, so that setup it was a definite must.
Now moved studio monitors, for the first week I missed the sub, but now I'm not missing it. My studio monitors go to 55hz but they seam a lot deeper.
Above is all on my computer setup.
These are what I run, of course on stands, isolation foam. There that accurate I was listing to an Areta Franklin track, and I could hear the background interference from the recording studio mixed into the actual track.
http://www.prodipe.co.uk/studio-monitors/2111-pro-5-v3.html
The following track has some really low frequencies in it, and I can feel these on my hands, how this is happening when there meant to only go 55hz, but I can.
https://www.beatport.com/track/alone/49315