i have had both mp40w as well as the tunze 6215. the biggest issue is you cannot compare the two as they are two completely different ideas and technology.. when you look at the mp40 you are using that pump generally as "FLOW" / water movement. whereas the tunze wavebox isnt made for flow. it is water displacement. yes there is "flow" from the pump however its not calculated as a GPH.. just due to the fact thats not the point of the pump.. the pump on the 6215 is to displace water in and out of the box. to generate a wave.. as for me.. on my 300 gallon i have two 6215's and also three 6100's all tunze pumps are basically silent. the difference of some of the older impellers on the tunze pumps used to cause noise.. because they had a cluch / break mechanism on the older impellers to prevent them from turning in reverse.. the newer impellers are solid and therfore the clicking sound has been removed....
just my .02
just my .02


