As the name suggests, noise-free car amplifiers try to address problems associated with noise and interference with car sound systems. The car has many sources of electrical noise which include the alternator, engine, and other electrical parts. Each of these sounds can affect the audio system resulting in hissing and humming noises. Degree of refinement in the power supply. Noisefree car amplifiers make use of advanced filtering techniques that preserve all signals from the audio systems interference. This will guarantee that the power delivered is substantially clean which enhances listening experience. Noiseless amplifiers are a necessity for people who love listening to music at low sound levels since the levels of noise are not high enough to suppress other sounds.