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Kinetic; I have 2 of the 6101's i do hear a bit of change in sound as they ramp up and down but the pumps are also brand new and i have only been running them sparingly on my new setup (tank is currently sitting in my garage with tap water in it to play around with the flow & controller options) so if they are anything like my 6025's were they will be even quitter after a little more break in time; I certainly can not hear the change in noise level if I'm about 2' away from the tank.
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Chris
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