Do you have it on the foam they provide? I've found pumps tend to quiet down after a week or two once everything breaks in. That said, my eheim is silent. If I didn't see water coming from my return, I wouldn't know it was on.
Strangely mine didn't come with foam. I'll give it a week or two and if it doesn't quiet down I'm switching to an ehiem. I just wasn't sure if this was an isolated issue to me
Is the noise coming from the pump itself or is it vibrating against the surface it is sitting on? A mouse pad or small piece of bubble wrap underneath it might help?