Jam any type of filter floss or poly foam product in the output area
I did that with several of my HOB filters. They're all completely silent now. The least favorite out of these filters is the Aqueon QF10.
I like running filters with the water level 75% below the top, so the filtered water agitates the surface of the water, but you can't do that with the AQ QF10 though because of the way it's designed.