I Just Bought The Nexus 25 From Xm. When You Put It On A Dock, Do You Need A Speaker To Listen To Xm Live?

i love to listen to xm live broadcast but can you listen to live broadcast just docking it and not having a speaker but using an ear-phone. If you need to get a stereo, can you just hook it up to speakers only or it has to have a radio connected? this is for nexus 25.