Long John S

Hey everyone, I bought a Klipsch R-100SW sub with the powered R-41PM speakers. When power is set to auto (middle position) the sub makes a pop when the speakers wake it up with the signal. Is this normal? The sub is connected to a separate wall socket, not into an extension with the speakers, but that was tested too, same pop. I am using a fully shielded RCA cable connected into the LFE input. I like the auto feature and don't necessary want to leave the sub on when I forget about it and nothing is playing. The pop is annying when it comes back on and worries me a bit. Thanks a lot in advance! EDIT: There is pop when I turn it on/off manually, with and without the RCA cable and the gain knob all the way down too.