This extremely powerful head unit is also extremely sophisticated. It features Alpine's unrivaled Bass Engine Pro sound personalization functions, including 6-channel digital time correction and a 5-band parametric EQ. You can even download sound settings using Alpine's i-Personalize website. With the ability to customize up to eight amplifiers, select from 512 illumination colors, and much more, this is simply an amazing head unit. The CDA-9833 is compatible with XM Satellite Radio- Simply add the TUA-T020XM tuner box and you will be enjoying coast-to-coast digital quality XM radio (XM service subscription fee required).