Sound is definitely a factor with any VorTech since the electrical motor is outside the tank, therefore no sound dampening via the water which is the case with conventional powerheads. I have no problem dealing with the sound (I don't refer to it as noise but that's just me), since VorTechs produce much better flow than anything else I've encountered. I use the night mode with my two MP40s, so the sound level drops quite a bit in the evening. The sound is most noticeable if ramping up and down from 0 to 100% power in short pulse mode. I use Tidal Swell Mode so the speed changes are more gradual and not as noticeable. If your tank is in the bedroom and sound is an issue, then yes, you probably need to rethink using VorTechs. Other than that, I found most other ambient sounds such as light fans etc. drown out the sound of my VorTechs.
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