I ordered one of the Marantz NR-1605 slim receivers from A4L. One of the features is "Eco Mode".\n\nOur new advanced Eco amplifier mode adjusts power consumption according to signal level, and there's an on-screen Eco Mode display that lets you see the power consumption reduction in real time.\n\nI have done a couple of Google searches and really cannot find out much about it.\nOne forum had a similar question and the only useful info was one guy stated that his AVR ran 10 degrees cooler with it on. \n\nIt has On, Off,and Auto settings. I do not want to be bothered with needing to turn it on or off depending on whether I am just putting music into my house (On) or doing loud and\/or critical listening (Off). So I would leave it off. However, if the auto setting is well designed, that would be great!\n\nDoes anyone know much of anything about it?\nTIA!