Amplifiers

Audio amplifier circuitry for driving an audio load, comprising

• an input for receiving an input audio signal and an output for outputting an output audio signal to an audio load electrically coupled, in use, to the output, wherein, in use, different audio loads may be removably coupled to the output via an audio connector;
• a storage module for storing a plurality of distortion settings;
• a controller for selecting one of the plurality of distortion settings based on an indication of a characteristic of the audio load coupled, in use, to the output;
• and
• a pre-distortion module applying a distortion function to the input audio signal based on the selected distortion setting.

An electronic device comprising:

• audio amplifier circuitry;
• a connector configured such that, in use, different audio loads can be removably electrically connected to an output of the audio amplifier circuitry;
• the audio amplifier circuitry comprising:
• an amplifier module for receiving an input digital audio signal and producing an amplified output analogue audio signal;
• and
• a pre-distortion module for applying a first transfer function to the digital audio input signal upstream of the amplifier module;
• wherein the first transfer function is variable based on an indication of the impedance of the audio load removably coupled to the output of the audio amplifier circuitry.

Audio amplifier circuitry comprising:

• an amplifier module located in a signal path between an input and an output;
• a detection module for detecting a characteristic of an audio load electrically coupled, in use, to the output via a removable mating connection;
• a distortion setting controller for selecting one of a plurality of stored distortion settings based on the detected characteristic of the audio load;
• and
• a pre-distortion module configured to apply a first transfer function to a signal in the signal path prior to said amplifier module, wherein the first transfer function is based on the selected distortion setting.