I read a lot about ball lifters having to be quiet in parlours...
If you ever go to a parlour, you will know that it is not quiet at all. The moment the door opens, you are blown away by the a wall of noise.
This is the reason we install extra volume controls, because the parlour sound is way too loud for home use. On top of that the stereo system they run is even making more noise than the machines themselves.
So if you want a good, quiet home use ball lifter, I suggest that you don' look too much at parlour systems.