sentences:  Thomas Edison, for example, showed that large audiences responded favorably when presented both live performances by artists and reproductions by his recording system, which today would be regarded as primitive in quality.Similarly, results of component evaluation between various listeners or even the same listener under different circumstances cannot be easily replicated or standardized.Similarly, the acoustic behavior of the listening room—the interaction between loudspeakers and the room's acoustics—and the interaction between an electromechanical device (loudspeaker) and an electronic device (amplifier) are subjected to many more variables than between electronic components.