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Nero 3 - how quiet are they supposed to be?

Hi all,

Question for any Nero 3 owners out there: I just got a new Nero 3 and it's noisier than I would expect. I can hear the humming/buzzing and it's not a smooth hum. It sounds like a fast vibration. Even below 50% I can hear the pump on my tank.

I have a pretty quiet return pump, and I can hear it over that. It gets noticably loud above 50-60%. Do I just need to let it break in or do you think there's something up with it?
 
Maybe something wrong with it. I'm assuming you've tried to take it apart and put it back together? Maybe something is stuck?

I have two new Nero 3s as well, and they constantly got jammed the first month of having them. But since then, they've been just fine.

Also pretty silent below 70% for me.
 
I did take it apart on the first day. It's actually quieted down significantly after the first day or two. It's almost silent on the variable setting I have it on (30-80%)

GC
 
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