Well, I tried the cardboard box cover deal and it still was loud. i think it is because of where it is located in the cabinet. I returned it for The Rena pump that Reberly mentioned. I got the Rena 100. Hopefully it is powerful enough to pump my flexible bubble bar. If not... I have had it and I will just have no pump and no extra bubbles.
when i get home I will have to see how quiet and how powerful it claims to be. i will leave an update after I try it out.