davepet wrote:1990 building - ...
Is that just the way it is nor or is there a problem developing ?
Does the system have the Ivie DSP-based system? If so, the only place the audio could mix is inside the DSP (unless somebody did some unauthorized rewiring, which is not likely).
In 2005, I was told by PA system installers that the Ivie equipment had reliability problems. In fact, one of the pieces of equipment installed at the stake center was defective on initial installation. (It produced a DC offset on one of the main outputs that went to a power amplifier, and the audio was distorted.)
If that happened at my meetinghouse, I'd call the STS and ask him to call Church headquarters. They probably have historical data that would indicate whether the problem is benign or likely to indicate a more serious failure on the way. As a workaround, if you have access to the rack, you could unplug the audio cable from the satellite receiver (except during a satellite program, of course).
Addendum after seeing the other intervening posts: The English audio from the satellite receiver usually goes through an audio distribution amplifier, which has a gain adjustment. If someone (with or without authorization) changed the gain setting on the DA, that might account for the change in system behavior.