I have a hammerhead as well and I hard plumbed it orginally and it was pretty darn loud, someting I had to fix ASAP. I used some rubber joints and hi-density pad and now it is quiet with a low hum. What pumps have you used before, maybe by luck i might have used the same model? I've also used an older model of the barracuda and to me it had the same noise level as the hammerhead.