I'm running an Dolphin Ampmaster 2100 with an OM 4 way, and it too is very quiet. It's rated for 2700GPH. The OM is directly fitted to the pump and the four returns are all 1". Three returns are fed at a time.
One other issue is the size of the pipe your using. You should have at least 1 1/2" pipe from that size pump. Your increasing your head pressure significantly, making the pump work harder and thus make more noise.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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