ok, not for EVERY movie but far more often than I would like...

I have a Klipsch cinema 10 system with a 10" powered sub.

last week i rented Indiana Jones and the Hulk (two pretty lame movies btw...) during the THX intro for Indiana Jones I could barely hear the sub so I so I cranked up the level on the sub to about 9. It was fine for the rest of the movie. Then later when I watched the Hulk the sub was WAAY too loud and over powering. I had to turn it down to about 4 to make it blend in. Is this constant adjusting normal?