Depends on what your listening objectives are. Home theater- subs can come in handy. Mostly 2-channel music, you would be better served by using speakers that can supply ample bass bandwidth.
The sad reality is that unless you have full range speakers (usually very large $) AND sufficient current (not just watts) to drive them you need subs. Sigh.
First, you want at least two subs, and second there are very few systems that wouldn’t benefit significantly from subs. Anyone who tells you differently hasn’t heard decent subs properly set up and dialed in. Not only will your in-room bass improve but also imaging and an expanded 3D soundstage. Once you listen with good subs you won’t wanna listen without them.
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