you should be able to get near silent with the only noise coming from where the water spills into the overflow chamber and where it enters the sump (gurgling).
When tuning mine, I just started with a small bit from my drill index going up in size until the water would stay at a constant height in the overflow chamber, then about one more size up. Was sort of neat how it went from the whistling to silent.
Each setup is different but for an idea I'm pushing 1000gph through 2-2" Dursos and the hole size is just a little bigger than 3/16" in each. These Dursos also worked when I had ~2000gph.
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