What jester7677 is describing is a little different than what I am experiencing. The pop I hear is not when the sound goes away but only when the 990 starts to receive a Dolby Digital signal from any device. I hear a pronounced pop just before the DD audio is audible. It doesn’t matter where the volume control is set either. The pop sounds the same no matter where the volume is set. I don’t get the pop with any 2 channel PCM digital audio signal from any device. I do hear a very faint tick with PCM but that faint tick doesn’t bother me at all. Also, I do not get this pop when changing inputs on the 990. Even when changing the input to a device that is sending a DD signal. Only the faint tick.