Voice lift specifically means the use of a microphone(s) to amplify or lift one’s voice in a given space. When a system is setup for voice lift speaking into a microphone will cause their voice to be broadcasted back into the room through their speakers essentially amplifying it so that everyone in the space can hear them clearly.
NOT all Revolabs products should be used for voice lift! The Solo series systems have a limited audio bandwidth. They were originally designed for standard definition audio and video calls only. They have a frequency response pattern of 100Hz-6.8 KHz. Any frequencies that are outside this range will distort the audio as the microphones are not designed to handle those frequencies.