An audio testing system (200, 300) at least comprising: an audio device (100, 101) under test, wherein the device under test comprises at least one loudspeaker (102a, 102b) configured to receive an audio test signal and to emit a sound in response to the audio test signal; at least one microphone (120, 120a, 120b) configured to receive the sound from the at least one loudspeaker (102a, 102b) and to output an electrical signal in response thereto; an audio analyser configured to apply the audio test signal to the audio device (100,101) under test, to receive the electrical signal from the at least one microphone (120, 120a, 120b) and to analyse the electrical signal to measure a level of distortion in the sound emitted by the loudspeaker; a signal feedback line (140, 140a, 140b) from the audio analyser to the device under test; and means for adjusting an output volume of the audio device (100, 101) under test and setting a maximum volume of the device under test; characterized in that: the means for adjusting an output volume of the audio device (100, 101) under test is configured to adjust the output volume to be initially substantially less than a maximum possible volume of the audio device, and to incrementally increase the output volume of the audio device if the level of distortion measured by the audio analyser is less than or equal to a maximum acceptable level of distortion until the audio analyser measures the level of distortion to be greater than the maximum acceptable level of distortion; and the audio analyser is configured to stop the audio test signal when the level of distortion is greater than the maximum acceptable level of distortion, then to determine whether the output volume of the audio device is less than a least acceptable value of the maximum volume of the audio device, and if so, to reject the at least one loudspeaker as out of specification, whereas if not, the means for adjusting an output volume of the audio device under test is configured to set the maximum volume of the device under test to be equal to the output volume of the audio device when the measured level of distortion was last less than or equal to the maximum acceptable level of distortion. an audio device (100, 101) under test, wherein the device under test comprises at least one loudspeaker (102a, 102b) configured to receive an audio test signal and to emit a sound in response to the audio test signal; at least one microphone (120, 120a, 120b) configured to receive the sound from the at least one loudspeaker (102a, 102b) and to output an electrical signal in response thereto; an audio analyser configured to apply the audio test signal to the audio device (100,101) under test, to receive the electrical signal from the at least one microphone (120, 120a, 120b) and to analyse the electrical signal to measure a level of distortion in the sound emitted by the loudspeaker; a signal feedback line (140, 140a, 140b) from the audio analyser to the device under test; and means for adjusting an output volume of the audio device (100, 101) under test and setting a maximum volume of the device under test; characterized in that: the means for adjusting an output volume of the audio device (100, 101) under test is configured to adjust the output volume to be initially substantially less than a maximum possible volume of the audio device, and to incrementally increase the output volume of the audio device if the level of distortion measured by the audio analyser is less than or equal to a maximum acceptable level of distortion until the audio analyser measures the level of distortion to be greater than the maximum acceptable level of distortion; and the audio analyser is configured to stop the audio test signal when the level of distortion is greater than the maximum acceptable level of distortion, then to determine whether the output volume of the audio device is less than a least acceptable value of the maximum volume of the audio device, and if so, to reject the at least one loudspeaker as out of specification, whereas if not, the means for adjusting an output volume of the audio device under test is configured to set the maximum volume of the device under test to be equal to the output volume of the audio device when the measured level of distortion was last less than or equal to the maximum acceptable level of distortion. the means for adjusting an output volume of the audio device (100, 101) under test is configured to adjust the output volume to be initially substantially less than a maximum possible volume of the audio device, and to incrementally increase the output volume of the audio device if the level of distortion measured by the audio analyser is less than or equal to a maximum acceptable level of distortion until the audio analyser measures the level of distortion to be greater than the maximum acceptable level of distortion; and the audio analyser is configured to stop the audio test signal when the level of distortion is greater than the maximum acceptable level of distortion, then to determine whether the output volume of the audio device is less than a least acceptable value of the maximum volume of the audio device, and if so, to reject the at least one loudspeaker as out of specification, whereas if not, the means for adjusting an output volume of the audio device under test is configured to set the maximum volume of the device under test to be equal to the output volume of the audio device when the measured level of distortion was last less than or equal to the maximum acceptable level of distortion.