In episode 15 (Court Martial) just before the episode's climax, the court is essembled on the Enterprise's bridge to conduct an expirement to determine if Commander Finney is still alive by using the ship's listening devises. Captain Kirk said that the ship's computers can amplify the sounds in the ship by 1 to the 4th power. 1 to the 4th power is the same as saying 1 * 1 * 1 * 1 which equals 1. If that's the case then the computer's aren't applifing anything.