I just noticed that my newly-installed self-contained siren (ELK-45 is the stainless enclosure) is whining at idle too. For the resistor, I assume it needs to be put at the siren, to keep supervision meaningful?
Otherwise, I also happen to have a ELK-44 speaker. Except for the (2x - since I am on millimiser anyway) loss of power if using it vs. the siren version, would it also whine or not?
BTW, talking about sirens, the most confusing option is the out2 hookup (G26). In RP, there are "Siren output" and "voltage out" options. If I interpret these correctly, "siren output" is for speakers and "voltage out" for self-contained sirens (pretty confusing)?