Speaker control systems are implemented using a variety of systems and methods. In one such system, an audio signal is distributed to at least one speaker selected from a set of speakers. The system includes a set of audio-distribution circuits for distributing the audio signal to the set of speakers. Logic circuitry is used to automatically determine an impedance-based parameter for use in distributing the audio signal to the at least one selected speaker based at least partly on a load-tolerance parameter for an audio source and on an impedance of the at least one selected speaker. The logic circuitry controls distribution of the audio signal to the selected speakers based at least partly on the impedance-based parameter. One or more of the set of audio-distribution circuits are used by the logic circuitry to distribute the audio signal to the at least one selected speaker.