While the car speakers usually are sufficient for good quality music, these following products can take your experience at a whole new level: Amplifiers: They simply amplify the audio signals i.e. boost a small musical signal into a more powerful electrical output to drive loudspeakers. The final result is great volume and lots of power available. Equalizers: They provide you the capability to fine tune a system. It is almost impossible to get perfect sound reproduction by speakers. Using equalizers, you can boost as well as cut particular frequency ranges to meet your needs. Crossovers: They are basically type of electronic filter circuits used in range of audio applications, so as to split up an audio signal into two or more frequency ranges, so that the signals can be sent to drivers designed for different frequency ranges. These are usually described as “two-way” or “three-way”. Subwoofers: They make the less audible sounds in a song or audio sample more clearer and more audible, so that every desired frequency is clearly heard. Wiring accessories: For connecting the car stereo to external additions like amplifiers or equalizers, you may require wiring accessories for proper connections and desired outputs.