The KDC-MP228 CD receiver offers plenty of power, tight sound controls, and MP3 and WMA playback ? a great package at such an attractive price! With this receiver, your never-ending supply of tunes will always sound great. The internal amplifier (22 watts RMS/50 peak x 4 channels) adds fullness to your music, while the System Q Sound Control's three-band equalizer and six preset tone curves let you fine-tune the sound. For some extra bass, you can add an amp/sub combo to the set of preamp outputs.