Previous version was quieter, even if you Unters water puts him up top by vibrations on the glass (only speculation!). I think that the previous version by the Sauggummis had a vibration damper. This model is even now held with a magnet mounted on the outside and thus have a direct contact to the aquarium.
A perfect solution, for example retract the filter modules with extension or filter changes to a new filter.
Since the retrogression of noise reduction is noticeable and this is an important criterion for some, I recommend somewhere still with stale positions in shops to buy the previous model with Sauggummis.
