Methods, apparatus, systems and articles of manufacture to determine audio source impact on an audience of media are disclosed. A disclosed example apparatus includes at least one memory, instructions in the apparatus, and processor circuitry to execute the instructions to: divide audio of monitored media into successive audio segments; perform speaker identification on the audio segments; generate confidence values for speakers identified in the audio segments; generate speaker identification data for ones of the speakers having respective confidence values that satisfy a threshold; and analyze the speaker identification data to determine a speaker impact on audience ratings data.