I have 2 MP40's and can agree with Doug/Fishytime... they have a little noise, especially if you use pulse modes, but on Reefcrest or Lagoon, silent.
The noise is the winding up and down, but not that bad. Compared to others and the features and power they offer, nothing can compare. I do recommend them.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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