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.

Can I Charge An Ipod From The Us In Australia Using A Speakers Dock? Voltage Differences?

I have bought an iPod touch from Ebay. It was from America and I live in Australia. What kind of troubles will I run into with charging?
I own iPod speakers (a docking system) which charges iPods, but if I plug it in to that will it be okay? Or will the voltage differences be an issue?
Anyone who knows about this would be a great help!