Patent ID: 7031476

Claim:
A speaker system operable to generate sound, comprising: a speaker operable to generate sound in response to an audio sign received form an audio amplifier, the speaker located in a speaker enclosure that is separate from the audio amplifier and electrically connected to the audio amplifier either through speaker cables or through wireless communication channel; and a communication module also located in the speaker enclosure that is also coupled to the audio amplifier through the speaker cables or wireless communication channel and that provides high impedance at frequencies within an audible range of the speaker system, the communication module solely in response to being powered on by a power signal received from the audio amplifier, and without further communication signaling from the amplifier, generating information that identifies electrical speaker characteristics for the speaker in the speaker enclosure and transmitting the information identifying the electrical speaker characteristics back over the speaker cables or wireless communication channel to the audio amplifier wherein the communication module communicates the electrical speaker characteristic from the speaker system to the audio amplifier using two-tone modulation.