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.  

I have Cornscalas, pretty much same specs as CWIV.  I have 100 Hz crossover and feel the subs are "part of the music."  I have two 10" subs.  

@jbhiller Yes, rightly said. I tried the CW4s by themselves and they sound great. I tried them with the REL subs and everything was just better. "More lifelike" is apt. 

I demoed the Cornwall IVs a few weeks ago and the bass floored me and my wife, when turned up. I can’t imagine adding subs to these. 

Interesting about the different comments around the bass. I think it is what you are used too. I run subs (not with cornwalls) and every system without subs seems lacking to me. I need flat sound down to 20hz to be happy with a system. Now that I have had it long-term I can’t live without it. 
I thought the cornwalls lacked deep bass (bass under 35hz?) with them both right next to the front wall and pulled out 5’ or so. Subs would be a must for me. Not to add bass but to extend it. I listen to modern music for what it is worth.