The quality of sound depends on the quality of the amplifier that you use. An amplifier is a device that increases the power of the audio signal to drive speakers. There are different types of amplifiers that are suited to different load types. For example, there are tube amplifiers that are suitable for low impedance loads. There are also different classes of amplifiers like Class A, B, AB, D, G, H, etc. Each class is categorized depending on the output power. The audio quality of the amplifier also depends on the type of components used, gain setting, etc.