MAZDA is well aware of research that shows the stereo is one of the most important items to a potential customer in this class. So it comes as no surprise that a good sound system finds its way into the SP20. It is a four-speaker AM/FM electronic-tune radio with a six-stack CD player. Well placed in relation to the driver, the head unit has large buttons to assist operation. The big volume/power button positioned close to hand gains top marks.