I installed this car stereo in the wall of my son’s room. It’s powered by a 3amp / 13.8vdc power supply (hidden in the attic above) and connected to four 6.5″ coaxial speakers mounted in the corners of the ceiling. The great thing about using a car stereo is the amount of features you get in a compact format. It has an MP3 player, a CD player, a high powered 5 channel amplifier, and an FM tuner.