Is a Sub required for HT

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.

Integrating the sub "well" is the key part. I say it’s difficult because it usually is. The goal in adding a sub to movies is of course extension, but you must also compensate for room modes as well as seamlessly blending the sub in with your satellites, or mains if not running them full range.

Most who consider adding a sub dont' have bass traps that work below 200 Hz, and that's the real enabler for EQ.

Does your receiver have a built-in room EQ?

Best,


Erik

I really have great experience with Hsu, similar pricing to SVS, but better looking cabinets I think.

Best,

Erik