I have a 4-way powered by a Sequence 3200. The OM is under the tank, and the pump is about 50 feet away in the fish room. The OM is quiet. I love it. The 6 returns are drilled into the sides of the tank (we t'd two of the returns off to small returns that go against the back of wall of the tank to keep it clean of detritus). The only problem I had when we first set it up was that sand would get caught in it and it would stop. It was a new southdown sandbed and the sand was flying everywhere. But OM was great - they sent me a new inside (shaft?) at no cost because the sand made a groove in it. I believe they were supposed to change the material of it so the sand wouldn't easily damage it. I highly recommend it!