I recently bought a Sennheiser EW 135 wireless. When I turned off the hand held transmitter first it almost blew out my speakers. I brought it back. I am told that your LX4 system has a feature to keep this from happening by instantly muting the signal in this event is this true? If so you should tout this fact in your advertiseing.
The amount of pop experienced by the LX system is dependent on the squelch control setting. The LX system uses a noise sensitive squelch.
The type of squelch that you are thinking of is called Tone Key.
See the following booklet for a description of squelch circuits:
Selection and Operation: Wireless Microphone Systems