Two iusses:1) Switching between sources you should be able to set the input level for each input so that you don’t get those big volume differences when switching between different sources. Check your manual2) Volume leveling Denon offers a feature similar to Dolby Volume called Dynamic Volume and it’s offered on some of their low-mid level receivers. Those receivers also have Dynamic EQ which changes the Equalization based on the volume level so when you have the volume low, the tonal balance doesn’t change (typically when you turn the volume down you lose bass and this compensates for that and any other frequency loss). I have these features on my Denon AVR 889. Unfortunately even with the dynamic volume set to the highest level, commercials can still be annoyingly loud, although not as bad as when the dynamic volume is turned off.