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This is a very common problem and it shouldn't happen – do you ever feel the need to change the volume when watching a movie at the cinema? It is caused by poor room acoustics. Mid and high frequency interference can cause the dialogue to be unclear so we try to compensate by turning the volume up. Then when the explosion happens it is way too loud. Alternatively the dialogue can be OK but the bass is too boomy and the same thing happens, the volume is set for speech and then the action is way too loud. Usually there is a combination of both problems but it's not too hard to fix them.
Mid and High frequencies - sound reflecting from the walls and ceiling can interfere with the sound coming straight from the speakers. This can make the sound seem slurred in time or it can make it seem like the tone is adjusted strangely. It can also make the stereo image less sharp and detract from the quality of surround sound effects. On the side walls and the ceiling, absorption reduces the size of these reflections and therefore reduces the amount they can interfere with the direct sound. Diffusion on the rear wall also reduces the problematic reflections but keeps the spaciousness of the room intact.Bass - Whether it's a home theatre or a recording studio, it's always hard to make the bass sound even all around the room. It is easy to identify by moving around the room and listening for changes in the bass. It usually shows up most by being too loud in the corners and weak in the middle of the room. A less obvious but equally important artefact is poor bass transients or ‘sloppy' bass. Most of the problems are caused by “standing waves” which can be greatly reduced with the use of Bass Traps. Bass Traps will make the bass more even around the room and make it tighter. Imaging and clarity will improve as well.