I'm a little unclear...(it's early).
Is it the master volume that your changing to 75db ? If the 1050 is like the 950, master volume should be set to 00db and individual channels (speakers) should be adjusted accordingly and individually via the trim controls. Depending on your room, your master volume would be set to 00db and your front left (for example) could be individually set for,say, -2db and the front right could be +1db and so on. This is what would give equal channel (speaker) balance.
As you increase or decrease the master volume control, the individual speaker settings would remain the same.
If I'm way off base, I apologize.
Does the trim levels on the 1050 have a "set" or "memory" button?