No way on this earth is the MCP655 louder than the MCP600, unless the MCP600 was switched off. I would say that they carried over some old info.
MCP655 is very fractionally louder than the MCP350.
MCP350 is about as loud as an Eheim 1250.
The Eheim 1048 is the quietest pump I've ever personally experienced.
Always have to watch the vibrations though. All pumps transmit vibrations, and if sitting on some hard surface they will make a fair amount of secondary noise that is not the actual noise of the pump itself.
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