Is a Sub required for HT


I'm a 2-channel guy that decided to add a separate HT system. I currently have a center channel speaker and AV receiver running through my 2-channel preamp's HT bypass. I just purchased rear channel speakers. I hate subs for 2-channel, but are they required for HT?  
ricred1
No....but!

Your receiver's bass management will route all the bass to existing speakers.  The experience of watching a movie with a well i tegrated sub is transformative.  Especially naval movies, but integrating a sub well is a ton of work to do rignt.  if you cant take that effort, leave it out.

To do subs well usually requires bass traps and DSP in that order.
I already have GIK room treatment, including bass traps. I don't understand why you say integration for HT is difficult? I won't be using a sub in my 2-channel system.