Audio Wiring / September 6, 2018 / Maggie Pimentel.
The audio preamplifier has several different functions. Its primary function concerns conversion of the sound information carried by the audio system’s electrical signals. The analog sounds produced by the car radio or the CD player enter the audio system as low-level signals. These low-level signals travel through the audio system to a pick-up or a transducer.
When a car owner plans to purchase a car amp, then that car owner must give thought to the amplifiers desired efficiency. The effectiveness of an amplifier represents the rate of power output into power input. Two primary factors determine an amplifier’s effectiveness: the power dissipation within the car amp and the distortion of the audio signal that comes from that same amplifier.
To understand the function of the car audio crossover one must first review the role of the car power amplifier. The power going into the amplifier comes from the car battery. After passing through the amplifier, a stronger and more powerful signal then passes into the car’s speaker system.
Unfortunately, the increased efficiency found in the Class D car amp comes at a price. The switching of the transistors leads to distortion of the audio signals at high frequencies. If the owner of a car audio system wants to abolish the distortion in the sound from a Class D car amp, then that individual must use a low-pass filter.