Before revision: A soundcheck is the preparation that takes place before a concert, speech, or similar performance, when the performer and the sound crew run through a small portion of the upcoming show on the venue's sound reinforcement system or PA system to make sure that the sound in the venue's front of house and stage monitor sound systems are producing clear sound that is at the right volume and which has the correct mix and tonal balance (a process done using the mixing console).
After revision: A soundcheck is the preparation that takes place before a concert, speech, or similar performance, when the performer and the sound crew run through a small portion of the upcoming show on the venue's sound reinforcement system or PA system to make sure that the venue's front of house and stage monitor sound systems are producing clear sound that is at the right volume and has the correct mix and tonal balance (a process done using the mixing console).