Originally Posted by wyatt_o
So, I'd still like to know what noise is normal for this kind of filter.
I guess the noise is in the ears of the listener. Without actually hearing your filter I can't tell for sure. I have owned 2 AC
50s and a 30. They all have a low hum. I can't hear it across the room, but maybe I'm old and my ears are getting bad. Maybe I just tune out white noise. There are many ambient sounds in the house that are way louder. These include the a/c or furnace and associated fan, the ceiling fan, the sump pump, and the refrigerator.
I did figure out something about the rubberband and the lid. Even with a lid that doesn't rattle, there is some resonance. I think the rubberband dampens that resonance. For some reason this AC
50 I have now just came with a rattling lid. But when I listened to it again with the rubberband off, there is still some resonance beyond any rattle. For me, rubberbanding it just works.
Bottom line, anything with moving parts is going to make noise. If you can hear your filter over the TV, or the other things I've already mentioned, maybe you really did just get an unusually noisy one. If so, you will probably do better working with the retailer rather than Hagen, but certainly, an overly noisy unit is not acceptable.