Is subwoofer required for soundbar operation ?
Do I need a subwoofer added for soundbar to enhance more clear and crisp TV sound output? Or will soundbar work for what I want without a subwoofer?
I view a Sub woofer as an extra item not needed with a "Sound Bar". The vast majority of time you (need) a sound bar with 40 inch and (smaller) TV because the speakers just suck big time no matter the model you buy.
Then you get into 50 inch and you still need a sound bar but want a little more kick add the Sub Woofer to your system.
From 50" and UP you would most likely move away from a sound bar for "Home Entertainment System" and go to separate speakers and Sub Woofer.
In the end a Sub Woofer is more "felt" then heard with the ears...
If you are big into stereos and will not make the neighbors angry then I would never bother with a Sound bar at all and go straight to Sound system with separate speakers and sub woofer.