Recreate, naturally, the sound of a live performance or the sound produced in a studio is probably the paradigm of many hi-fi enthusiasts. Most of them invested sums of money on expensive audio equipment that promise a better and more realistic listening experience. But beyond the technical specifications and quality of each component separately, the sound you hear is the result of the series connection of all elements of the audio chain. So if the goal is a more natural and realistic sound What part of this chain must give greater importance and allocate more resources? Is there a critical element in this chain that can strongly affect the final sound we perceive? I believe that most audiophiles do not analyze these questions in an objective and are seduced by advertising, design and technical specifications of any of these components, without a glimpse of the final sound is the result of the whole and that each stage chain must be consistent with others in quality and performance. The sound you hear will sound as good as the weakest element of this chain. In simplified form we can identify three stages in the chain of sound: the input signal (typically a CD player), the power amp (preamp + power amp or integrated amp) and finally the stage of electrical signal transduction alternating sound waves: the system speakers (or headphones). Some basic technical concepts that are present in the specifications of these computers and allow for comparisons are: frequency response, signal to noise ratio (S / R), total harmonic distortion (THD), power rating and efficiency.