With the CQ-C5401U you can enjoy radio-XM satellite Radio-when you hook up the optional XM receiver and digital adapter. XM Radio uses digital transmission to provide CD-like sound quality, with over 130 channels and 100% commercial-free music on channels of your choice. In addition to rock, jazz, country, blues, classical and other genres on more than 60 music channels, you also have over 30 channels of news, sports, talk and entertainment, plus over 20 dedicated channels of XM instant traffic and weather. With XM Radio, you can look forward to a mobile listening experience that's always fresh and never boring.A MOS-FET high power amplifier (50W x 4 max.) delivers pure signal output by minimizing crossover distortion during current-to-voltage conversion of the signal from the preamp stage. What does this mean? Benefits are apparent in an excellent high-range signal-to-noise ratio, reflecting minimal treble noise. The result is highly faithful sound reproduction with expressive musical detail.This CD receiver not only plays CDs, but also CD-R/RW discs, including MP3 and WMA formats. If you've got WMA and MP3 music files recorded on the same CD-R/RW disc, no problem-our CD receiver can handle it. For your listening pleasure, the acclaimed Alphatuner V FM/AM tuner circuitry is built into this unit as well, and there are 18 FM and 6 AM presets. Through years of experience, our advanced technology has made it possible to pack all of these incredible features into such a compact 1-DIN form.You can easily upgrade to an external amp system by using the dual preamp outputs on this 4-channel head unit. This allows for a maximum output voltage of 5V and output impedance of 60 ohms that not only help protect the signal from external noise, but also permit low power amp gain for powerful reproduction of transient peaks with minimum distortion. In addition, a non-fading, low impedance subwoofer output is available to make adding a dedicated subwoofer amplifier to your system easy.Personalize your sound system with our SQ3 3-band graphic equalizer. Not only does it provide manual adjustments to help you fine tune your music, but it also offers a series of one-touch equalizer settings, such as Rock, Pop, Vocal, Jazz, Club and Flat. minimize