What is the most quiet return pumps?

[sphelps]

Ive used an amp master pump before as well, they are quiet but I don't know if they are that efficient. The 4000/3000 model has an average power rating of 170W. The dart has similar flow characteristics but has an average rating of 145W. I do think the amp master may be a quieter pump though, but tough to say as I've never actually had them side by side in the same application.