Your speakers may go deep but even so you'll be surprised at the improvement if you add four subs. Not one. Forget one. Not that it won't be a bit better, but you're talking baby steps. Four is great strides. Do a search, read my review, read comments from audiokinesis, noble100, and everyone else you can find who has a distributed bass array or Swarm subwoofer system. There's no comparison.
Its not merely deep bass. Its much more than that. Its a feeling of envelopment that comes from being able to accurately reproduce the extreme low frequency signature of large spaces and halls. Its unlike anything you've ever heard, because if you'd heard it you wouldn't even be asking about "a" sub you'd be asking about four.
Oh and you are right about the movies. Mine is also high end audio/video and no compromises, and the effects with some movies is mind-blowing.
https://systems.audiogon.com/systems/8367
Its not merely deep bass. Its much more than that. Its a feeling of envelopment that comes from being able to accurately reproduce the extreme low frequency signature of large spaces and halls. Its unlike anything you've ever heard, because if you'd heard it you wouldn't even be asking about "a" sub you'd be asking about four.
Oh and you are right about the movies. Mine is also high end audio/video and no compromises, and the effects with some movies is mind-blowing.
https://systems.audiogon.com/systems/8367