If you ordered your 950 on or after December 17th, you have the new revision.

If you do not have the new revision, the new one will give you almost double the acoustic volume for the same position on the volume control.

If you do have the new one, I suggest that you calibrate the system using the internal tone of the 950, and a RadioShack analog sound level meter. Doing this will yield levels that match the level the movie was mixed at, when the main volume is at "00".