I'm new to a Tyros 5.
I've now put the sub-woofer on a polystyrene box on our front room carpet. This is because with the bass up at a normal "home volume," my wife said she could feel the vibration when she was sitting in her chair in the other reception room, with both doors closed! (our internal walls are brick, they aren't dry-lined stud partitions). For me, the bass is more than enough.