People say they are but the ones I have/had have not been. I currently have a 2.5,3,12 and 18 and they are all quite. The 2.5 is running externally on my calcium reactor with no noticeable noise. Those that have them and say they are noisy probably need a new impeller.
Noise is very subjective. I had a Mag 3 and considered it quite. That is until I got a Quite One 4000. The QO pumps 3 times as much watter and is much quieter than the Mag. The QO also uses only 40% more power than the Mag 3 while maintaining 300% more water flow.
Mags are good pumps, I just think there are better options out there.
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