I had similar experience when putting new (old B&W) bookshelf speakers in my office. Surprising amount of bass compared to older B&O. I added my Velodyne Servo 1200 back in old settings, new location. Way too much bass. After I got it proper, the sub is adding just a little bit, you are unaware it's on until you turn it off. You probably can get that slight but unobtrusive extension also.
Same thing with rear surround, most people have them too loud. Most of the time you should not be aware of them, until, turn therm off, the image crashes to the front.
Same thing with rear surround, most people have them too loud. Most of the time you should not be aware of them, until, turn therm off, the image crashes to the front.