Why I'm not adding a sub to my 2-way monitors for music

I didn't do much research.  I had been thinking about adding a sub for a while when I happened upon Herb Reichert Stereophile review of the SVS Micro 3000 w/ M30.2's.  It just seemed to be a good match so I didn't look much further.  I did consider the KEF KC62 for a moment (I think that's the model, their small sub) but it was almost double the price.  

I'm always happy to read when people have positive easy experiences with subs they are happy with. 😁

it's all down to set up. if you can set the sub up properly it sounds good. if you cannot, then do not go for it

Using Rel s5 Sho subs with my Thiel 3.7s.  I would never go back to no subs.  There is a presence and expansion of the sound stage that I would very much miss.  That said, if you listen to chamber music or music without much lower frequency information, I would image you wouldn't miss having subs in your system.  

No reason not to have a quality sub.  An SVS Pro is an affordable quality option that has a dedicated iphone app that lets you adjust the EQ, crossover, volume, etc to your liking.  I use different saved settings for music and video.  I also adjust it based on the particular album I listen to.