Cornwall IV and subwoofers

I run CWIVs with two REL T9i subs.  I would think T7i (smaller units) would suffice.  They are run off speaker level outputs from the amplifier.  They are not necessary, but fill in the lowest octave and provide a good sense of stage depth and make things seem even more lifelike.  

@wrm57 ,  FYI,  classic golden age jazz (50s-60s) is my favorite cup of tea.  And, the RELs really augment the lifelike sound that's present.  Surprisingly, even with 1950s recordings--they bolster the ambiance of the recording room.  I was playing Oscar Petersen's 1959 Porgy and Bess last night and the RELs do more than I would even expect on such old recordings. 

One more thing---

I think the Cornwall IV bass response is accurate where it exists. It's not bloated at all.  But, if you have a bigger room they may need help to pressurize it.  If you put these in a smallish room, I bet the bass end of things would sound larger than life.  My room is 15.' wide by 22' long with 10 foot ceilings.  It's big for me.