I have had many eheims....cannisters, pumps, and internal filters. At one time I had over 24 of them running on my freshwater setups (when you get that many, getting the lower wattage filters really helps). I have used everything of theirs from the hobby pumps to the large 1260 '5-gallon' cannister filter. Once I needed a silent cannister to run a 90g and a 75g next to my bed in college. I used a 2217 and a 2208 (pro series). I could sleep right next to the filter housings...my pillow and ear on the filter shroud itself, and all I could hear was the 'whoosh' of water passing through the pipes & pump OVER the noise of the pump itself.
I have had a 1050 hobby pump that finally died after 15 years of non-stop, no noise, no impeller changing service....it finally wore through the ceramic shaft until it cracked.
The hobby pumps CAN make noise, but its not from the pump itself. Its from the vibrations of the pump if they arent secured properly. When using mine in a sump, I wrap the mounting plate with silicone tubing to give the pump a nice cushion. This makes it silent again. As you get up to the 1262, yeah, there is a slight hum when you get within a couple feet...but you really have to try to hear it...and it somewhat depends on the pressure/flow its making at the time. But if its making more noise than this...its because you arent securing/padding the base properly and the vibrations can be loud then. As for the 1260 and smaller...dead silent.