are pumps louder if they are in line?

[hawks66]

i finally got my tank filled and turned on my return. i have a danner mag drive 12 running in line and it is crazy loud. a low rumble all the time, partly vibrations which i tried the mouse pad trick for, but it still is far too loud. could it just be defective? would it be better if i put it in the sump? everyone online says that their danner is silent. this is not the case. it makes the whole stand rumble.

[scuzy]

Mag drive pumps are loud to begin with.I would look at a different pump. The dc pumps are super quiet as well as the tunze silence, sicce syncra, and eheim

[Fizz71]

If you can put both hands on your pump, squeeze it and it gets dead silent, it's not the pump (more or less)--it's vibrating something. I actually have a powerhead in my tank that is normally dead silent but because it's magnetically attached with a VERY strong magnet it vibrates very loudly.

Some pumps handle their own vibrations well, other need help. Some people use mousepads like you said, but others also use flexible tubing. I had one pump that didn't get quite until I bolted then d*mn thing to a wooden board.

[hawks66]

sadly squeezing makes no difference.

[Fizz71]

So then it's an internal vibration issue...you either have a defective pump or the shaft and prop aren't seated properly. That's actually a GOOD thing...it's easier to fix than a vibrating 240g tank.