The sound system is in an airplane. The gentlemen who owns the airplane is complaining that the people speaking are at one volume level and the events taking place (gun shots, car crashes) are very loud. He is watching a movie and can hear the talking fine, then the actions starts and he has to turn down the volume. Then the action stops and he has to turn up the volume to here the talking. Is there something that can be installed to keep the sound level constant? I can get the particulars on the audio and video equipment installed, and I know that this is probably not a defect, but I am looking for some help on how to help this situation.